《名师一号》阶段测评四

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2015名师一号计时双基练40

2015名师一号计时双基练40

计时双基练40机械振动(限时:45分钟满分:100分)A级双基达标1.(2014·上海市松江二中测试)如练图12-1-1所示,两根细线长度均为2 m,练图12-1-1A细线竖直悬挂且在悬点O处穿有一个金属小球a,B悬挂在悬点O′处,细线下端系有一金属小球b,并且有m a>m b,把金属小球b向右侧拉开3 cm到b′处,然后同时让金属小球a、b由静止开始释放(不计阻力和摩擦),则两小球的最终情况是()A.a小球先到达最低点,不可能和b小球在最低点相碰撞B.b小球先到达最低点,不可能和a小球在最低点相碰撞C.a、b两小球恰好在最低点处发生碰撞D.因不知道m a、m b的具体数值,所以无法判断两小球的最终情况解析小球a到达最低点的时间t a=2lg=105s≈0.63 s;b球到达最低点的时间t b=14T=π2lg=π510s≈0.70 s;所以a小球先到达最低点,不可能和b 小球在最低点相碰撞,选项A 正确.答案 A2.一质点做简谐运动的图象如练图12-1-2所示,下列说法正确的是( )练图12-1-2A .质点振动频率是4 HzB .在10 s 内质点经过的路程是20 cmC .第4 s 末质点的速度为零D .在t =1 s 和t =3 s 两时刻,质点位移大小相等、方向相同 解析 振动图象表示质点在不同时刻相对平衡位置的位移,由图象可看出,质点运动的周期T =4 s ,其频率f =1T =0.25 Hz ;10 s 内质点运动了52T ,其运动路程为s =52×4A =52×4×2 cm =20 cm ;第4 s 末质点在平衡位置,其速度最大;t =1 s 和t =3 s 两时刻,由图象可看出,位移大小相等,方向相反.由以上分析可知,B 选项正确.答案 B3.铺设铁轨时,每两根钢轨接缝处都必须留有一定的间隙,匀速运行列车经过轨端接缝处时,车轮就会受到一次冲击.由于每一根钢轨长度相等,所以这个冲击力是周期性的,列车受到周期性的冲击做受迫振动.普通钢轨长为12.6 m ,列车固有振动周期为0.315 s .下列说法正确的是()A.列车的危险速率为20 m/sB.列车过桥需要减速,是为了防止列车发生共振现象C.列车运行的振动频率和列车的固有频率总是相等的D.增加钢轨的长度有利于列车高速运行解析列车在钢轨上运动时,受钢轨对它的冲击力作用做受迫振动,当列车固有振动频率等于钢轨对它的冲击力的频率时,列车振动的振幅最大,因v=lt=12.6 m0.315 s=40 m/s,故A项错误;列车过桥做减速运动,是为了使驱动力频率远小于桥梁固有频率,防止桥发生共振现象,而不是列车发生共振现象,B项错,C项错;增加钢轨的长度有利于列车高速运行,D项对.答案 D4.(多选题)如练图12-1-3①所示,小球在内壁光滑的固定半圆形轨道最低点附近做小角度振动,其振动图象如练图12-1-3②所示,以下说法正确的是()练图12-1-3A.t1时刻小球速度为零,轨道对它的支持力最小B.t2时刻小球速度最大,轨道对它的支持力最小C.t3时刻小球速度为零,轨道对它的支持力最大D.t4时刻小球速度最大,轨道对它的支持力最大解析 小球在t 1和t 3时刻,位移最大,小球速度为零,轨道对小球支持力最小;在t 2和t 4时刻,位移为零,小球速度最大,轨道对小球的支持力最大.答案 AD5.一简谐振子沿x 轴振动,平衡位置在坐标原点.t =0时刻振子的位移x =-0.1 m ;t =43s 时刻x =0.1 m ;t =4 s 时刻x =0.1 m .该振子的振幅和周期不可能为( )A .0.1 m ,83s B .0.1 m,8 s C .0.2 m ,83 s D .0.2 m,8 s 解析 若振子的振幅为0.1 m ,43 s =⎝ ⎛⎭⎪⎫n +12T ,则周期最大值为83 s ,A 项正确、B 项错误;若振子的振幅为0.2 m ,由简谐运动的对称性可知,当振子由x =-0.1 m 处运动到负向最大位移处再反向运动到x =0.1 m 处,再经n 个周期时所用时间为43 s ,则⎝ ⎛⎭⎪⎫12+n T =43 s ,所以周期的最大值为83s ,且t =4 s 时刻x =0.1 m ,故C 项正确;当振子由x =-0.1 m 经平衡位置运动到x =0.1 m 处,再经n 个周期时所用时间为43 s ,则⎝ ⎛⎭⎪⎫16+n T =43 s ,所以此时周期的最大值为8 s 且t =4 s 时,x =0.1 m ,故D 项正确.答案 B6.弹簧振子以O 点为平衡位置在B 、C 两点之间做简谐运动,B 、C 相距20 cm.某时刻振子处于B 点,经过0.5 s ,振子首次到达C 点,则该振动的周期和频率分别为__________、__________;振子在5 s 内通过的路程及5 s 末的位移大小分别为__________、__________.解析 设振幅为A ,由题意BC =2A =20 cm ,所以A =10 cm ,振子从B 到C 所用时间t =0.5 s ,为周期T 的一半,所以T =1.0 s ,f =1T =1.0 Hz ;振子在一个周期内通过的路程为4A ,故在t ′=5 s =5T 内通过的路程s =t ′T ×4A =200 cm ;5 s 内振子振动了5个周期,5 s 末振子仍处在B 点,所以它偏离平衡位置的位移大小为10 cm.答案 1.0 s 1.0 Hz 200 cm 10 cm7.某实验小组在利用单摆测定当地重力加速度的实验中.(1)用游标卡尺测定摆球的直径,测量结果如练图12-1-4所示,则该摆球的直径为________cm.练图12-1-4(2)小组成员在实验过程中有如下说法,其中正确的是________.(填选项前的字母)A .把单摆从平衡位置拉开30°的摆角,并在释放摆球的同时开始计时B .测量摆球通过最低点100次的时间t ,则单摆周期为t 100C .用悬线的长度加摆球的直径作为摆长,代入单摆周期公式计算得到的重力加速度值偏大D .选择密度较小的摆球,测得的重力加速度值误差较小解析(1)游标卡尺读数为0.9 cm+5×0.1 mm=0.95 cm.(2)单摆符合简谐运动的条件是最大偏角不超过5°,并从平衡位置计时,故A项错误;若第一次过平衡位置计为“0”,则周期T=t50,若第一次过平衡位置计为“1”,则周期T=t49.5,B项错误;由T=2πLg得g=4π2LT2,其中L为摆长,即悬线长加摆球半径,若为悬线长加摆球直径,由公式知g偏大,故C项正确;为了能将摆球视为质点和减少空气阻力引起的相对误差,应选密度较大体积较小的摆球,故D项错误.答案(1)0.95(2)C8.一质点做简谐运动,其位移和时间关系如练图12-1-5所示.练图12-1-5(1)求t=0.25×10-2 s时的位移;(2)在t=1.5×10-2s到2×10-2s的振动过程中,质点的位移、回复力、速度、动能、势能如何变化?(3)在t=0至8.5×10-2 s时间内,质点的路程、位移各多大?解析(1)由图可知A=2 cm,T=2×10-2 s,振动方程为x =A sin ⎝ ⎛⎭⎪⎫ωt -π2=-A cos ωt =-2cos 2π2×10-2t cm =-2cos(102πt ) cm当t =0.25×10-2 s 时,x =-2cos π4cm =-2 cm. (2)由题图可知在1.5×10-2~2×10-2 s 时间内,质点的位移变大,回复力变大,速度变小,动能变小,势能变大.(3)从t =0至8.5×10-2 s 的时间内质点的路程为s =17A =34 cm ,位移为2 cm.答案 (1)- 2 cm(2)位移变大,回复力变大,速度变小,动能变小,势能变大(3)34 cm 2 cmB 级 能力提升1.有两个同学利用假期分别去参观北大和南大的物理实验室,各自在那里利用先进的DIS 系统较准确地探究了“单摆的周期T 与摆长l 的关系”,他们通过校园网交换实验数据,并由计算机绘制了T 2-l 图象,如练图12-1-6①所示.去北大的同学所测实验结果对应的图线是______(填“A ”或“B ”).另外,在南大做探究的同学还利用计算机绘制了a 、b 两个摆球的振动图象(如练图12-1-6②),由图可知,两单摆摆长之比l a l b=________.在t =1 s 时,b 球振动的方向是________.练图12-1-6解析 由单摆的周期公式T =2π l g得:T 2=4π2g l ,即图象的斜率k =4π2g ,重力加速度越大,斜率越小,我们知道北京的重力加速度比南京的大,所以去北大的同学所测实验结果对应的图线是B ;从题图②可以得出:T b =1.5T a ,由单摆的周期公式得:T a =2π l a g ,T b =2π l b g ,联立解得:l a l b =49;从题图②可以看出,t =1 s 时b 球正在向负最大位移运动,所以b 球的振动方向沿y 轴负方向.答案 B 49沿y 轴负方向 2.如练图12-1-7所示,图①为一列沿水平方向传播的简谐横波在t =0时的波形图,图②是这列波中质点P 的振动图线,那么:练图12-1-7(1)该波的传播速度为________m/s.(2)该波的传播方向为________(填“向左”或“向右”).(3)图①中Q 点(坐标为x =2.25 m 处的点)的振动方程为:y =________cm.解析(1)波的周期T=2 s,波长λ=1 m,波速v=λT=0.5 m/s.(2)P点向上运动,不难判断波是向左传播.(3)Q点此时从最大位移开始向平衡位置运动,振动图象是一条余弦曲线,A=0.2 cm,ω=2πT=π,Q点的振动方程为y=0.2cos(πt)cm.答案(1)0.5(2)向左(3)0.2cos(πt) cm3.(1)(多选题)将一个力电传感器接到计算机上,就可以测量快速变化的力,用这种方法测得的某单摆摆动时悬线上拉力的大小随时间变化的曲线如练图12-1-8所示.某同学由此图象提供的信息作出的下列判断中,正确的是________.练图12-1-8A.t=0.2 s时摆球正经过最低点B.t=1.1 s时摆球正经过最低点C.摆球摆动过程中机械能减小D.摆球摆动的周期是T=1.4 s(2)(多选题)如练图12-1-9所示为同一地点的两单摆甲、乙的振动图象,下列说法中正确的是________.练图12-1-9A.甲、乙两单摆的摆长相等B.甲摆的振幅比乙摆大C.甲摆的机械能比乙摆大D.在t=0.5 s时有正向最大加速度的是乙摆解析(1)悬线拉力在经过最低点时最大,t=0.2 s时,F有正向最大值,故A选项正确,t=1.1 s时,F有最小值,不在最低点,周期应为T=1.0 s,因振幅减小,故机械能减小,C选项正确.(2)从题图上看出甲摆振幅大,故B项对.且两摆周期相等,则摆长相等,因质量关系不明确,无法比较机械能.t=0.5 s时乙摆球在负的最大位移处,故有正向最大加速度,所以正确答案为A、B、D.答案(1)AC(2)ABD4.简谐运动的振动图线可用下述方法画出:如练图12-1-8①所示,在弹簧振子的小球上安装一枝绘图笔P,让一条纸带在与小球振动方向垂直的方向上匀速运动,笔P在纸带上画出的就是小球的振动图象.取振子水平向右的方向为振子离开平衡位置的位移正方向,纸带运动的距离代表时间,得到的振动图线如练图12-1-10②所示.练图12-1-10(1)为什么必须匀速拖动纸带?(2)刚开始计时时,振子处在什么位置?t=17 s时振子相对平衡位置的位移是多少?(3)若纸带运动的速度为2 cm/s,振动图线上1、3两点间的距离是多少?(4)振子在________s末负方向速度最大;在________s末正方向加速度最大;2.5 s时振子正在向________方向运动.(5)写出振子的振动方程.解析(1)纸带匀速运动时,由x=v t知,位移与时间成正比,因此在匀速条件下,可以用纸带通过的位移表示时间.(2)由题图②可知t=0时,振子在平衡位置左侧最大位移处;周期T=4 s,t=17 s时位移为零.(3)由x=v t,所以1、3间距x=2 cm/s×2 s=4 cm.(4)3 s末负方向速度最大;加速度方向总是指向平衡位置,所以t=0或t=4 s时正方向加速度最大;t=2.5 s时,向-x方向运动.(5)x =10sin ⎝ ⎛⎭⎪⎫π2t -π2 cm 或x =-10cos ⎝ ⎛⎭⎪⎫π2t cm. 答案 (1)在匀速条件下,可以用纸带通过的位移表示时间(2)左侧最大位移 零(3)4 cm(4)3 0或4 -x(5)x =10sin ⎝ ⎛⎭⎪⎫π2t -π2 cm或x =-10cos ⎝ ⎛⎭⎪⎫π2t cm。

【名师一号】2014-2015学年高中数学 三角恒等变换单元测评 新人教A版必修4

【名师一号】2014-2015学年高中数学 三角恒等变换单元测评 新人教A版必修4

三角恒等变换(时间:90分钟 满分:120分) 第Ⅰ卷(选择题,共50分)一、选择题:本大题共10小题,共50分.1.已知sin(α-β)cos α-cos(α-β)sin α=45,且β是第三象限角,则cos β2的值等于A .±55 B .±255C .-55D .-255解析:由已知,得sin[(α-β)-α]=sin(-β)=45,得sin β=-45.∵β在第三象限,∴cos β=-35.∴cos β2=±1+cos β2=± 15=±55. 答案:A2.若tan α=3,则sin2αcos 2α的值等于 A .2 B .3 C .4 D .6解析:sin2αcos 2α=2sin αcos αcos 2α=2tan α=2³3=6. 答案:D3.函数y =cos2x +sin2x cos2x -sin2x 的最小正周期为A .2πB .π C.π2D.π4解析:y =1+tan2x 1-tan2x =tan ⎝ ⎛⎭⎪⎫2x +π4,∴T =π2. 答案:C4.设a =sin14°+cos14°,b =sin16°+cos16°,c =62,则a ,b ,c 的大小关系是 A .a <b <cB .b <a <cC .c <b <aD .a <c <b解析:a =2sin59°,b =2sin61°,c =2sin60°, ∴a <c <b . 答案:D5.函数y =sin x cos x +3cos 2x -3的图像的一个对称中心是 A.⎝⎛⎭⎪⎫2π3,-32B.⎝ ⎛⎭⎪⎫5π6,-32C.⎝ ⎛⎭⎪⎫-2π3,32D.⎝⎛⎭⎪⎫π3,-3解析:y =12sin2x +32(1+cos2x )-3=12sin2x +32²cos2x -32=sin ⎝ ⎛⎭⎪⎫2x +π3-32,令2x+π3=k π,x =k π2-π6(k ∈Z ),当k =2时,x =5π6,对称中心是⎝ ⎛⎭⎪⎫56π,-32. 答案:B6.已知点P (cos α,sin α),Q (cos β,sin β),则|PQ →|的最大值是 A. 2 B .2 C .4D.22解析:PQ →=(cos β-cos α,sin β-sin α),则 |PQ →|=β-cos α2+β-sin α2=2-α-β,故|PQ →|的最大值为2. 答案:B7.若(4tan α+1)(1-4tan β)=17,则tan(α-β)的值为 A.14 B.12C .4D .12 解析:由已知得:4(tan α-tan β)=16(1+tan αtan β),即tan α-tan β1+tan αtan β=4,所以tan(α-β)=4. 答案:C8.函数f (x )=sin x -cos ⎝⎛⎭⎪⎫x +π6的值域为A .[-2,2]B .[-3,3]C .[-1,1]D.⎣⎢⎡⎦⎥⎤-32,32 解析:因为f (x )=sin x -32cos x +12sin x =3²⎝ ⎛⎭⎪⎫32sin x -12cos x =3sin ⎝ ⎛⎭⎪⎫x -π6,所以函数f (x )的值域为[-3,3].答案:B9.函数y =sin ⎝⎛⎭⎪⎫2x -π3-sin2x 的一个单调递增区间是A.⎣⎢⎡⎦⎥⎤-π6,π3B.⎣⎢⎡⎦⎥⎤π12,712πC.⎣⎢⎡⎦⎥⎤512π,1312πD.⎣⎢⎡⎦⎥⎤π3,5π6解析:y =sin ⎝ ⎛⎭⎪⎫2x -π3-sin2x =-sin ⎝ ⎛⎭⎪⎫2x +π3,其增区间是函数y =sin ⎝ ⎛⎭⎪⎫2x +π3的减区间,即π2+2k π≤2x +π3≤3π2+2k π,∴π12+k π≤x ≤7π12+k π,当k =0时,x ∈⎣⎢⎡⎦⎥⎤π12,7π12.答案:B10.已知sin2α=35⎝ ⎛⎭⎪⎫π2<2α<π,tan(α-β)=12,则tan(α+β)的值为A .-2B .-1C .-211D.211解析:由sin2α=35,且π2<2α<π,可得cos2α=-45,所以tan2α=-34,所以tan(α+β)=tan[2α-(α-β)]=tan2α-α-β1+tan2αα-β=-2.答案:A第Ⅱ卷(非选择题,共70分)二、填空题:本大题共4小题,每小题5分,共20分.11.若π4<α<β<π2,sin α+cos α=a ,sin β+cos β=b ,则a ,b 的大小关系是__________.解析:sin α+cos α=2sin ⎝ ⎛⎭⎪⎫α+π4,sin β+cos β=2sin ⎝ ⎛⎭⎪⎫β+π4,因为π4<α<β<π2,所以π2<α+π4<β+π4<3π4,所以sin ⎝ ⎛⎭⎪⎫α+π4>sin ⎝ ⎛⎭⎪⎫β+π4,所以a >b .答案:a >b12.已知θ∈⎝ ⎛⎭⎪⎫π2,π,1sin θ+1cos θ=22,则sin ⎝ ⎛⎭⎪⎫2θ+π3的值为__________. 解析:由已知条件可得sin ⎝⎛⎭⎪⎫θ+π4=sin2θ,又θ∈⎝ ⎛⎭⎪⎫π2,π,可知θ+π4+2θ=3π,即θ=11π12,sin ⎝ ⎛⎭⎪⎫2θ+π3=sin 13π6=12. 答案:1213.已知cos αcos(α+β)+sin αsin(α+β)=-35,β是第二象限角,则tan2β=__________.解析:由已知可得,cos β=-35,可求tan β=-43,∴tan2β=247.答案:24714.关于函数f (x )=cos2x -23sin x cos x ,下列命题:①存在x 1,x 2,当x 1-x 2=π时,f (x 1)=f (x 2)成立;②f (x )在区间⎣⎢⎡⎦⎥⎤-π6,π3上单调递增;③函数f (x )的图像关于点⎝⎛⎭⎪⎫π12,0成中心对称图形;④将函数f (x )的图像向左平移5π12个单位长度后将与y =2sin2x 的图像重合.其中正确命题的序号是__________(注:把你认为正确的序号都填上). 解析:∵f (x )=2sin ⎝ ⎛⎭⎪⎫π6-2x=2sin ⎝⎛⎭⎪⎫2x +5π6=2sin2⎝⎛⎭⎪⎫x +5π12,∴周期T =π,故①正确;∵π2≤2x +5π6≤3π2,解得x ∈⎣⎢⎡⎦⎥⎤-π6,π3,∴⎣⎢⎡⎦⎥⎤-π6,π3是其递减区间,故②错误;∵对称中心的横坐标满足2x +5π6=k π(k ∈Z )⇒x =k π2-5π12(k ∈Z ),当k =1时,得③正确;应该是向右平移,故④不正确. 答案:①③三、解答题:本大题共4小题,满分50分.15.(12分)已知A ,B ,C 为△ABC 的三个内角,且A <B <C ,sin B =45,cos(2A +C )=-45,求cos2A 的值.解:∵A <B <C ,A +B +C =π, ∴0<B <π2,A +C >π2,0<2A +C <π.∵sin B =45,∴cos B =35.∴sin(A +C )=sin(π-B )=45,cos(A +C )=-35.(4分)∵cos(2A +C )=-45,∴sin(2A +C )=35.(8分)∴sin A =sin[(2A +C )-(A +C )] =35³⎝ ⎛⎭⎪⎫-35-⎝ ⎛⎭⎪⎫-45³45 =725. ∴cos2A =1-2sin 2A =527625.(12分)16.(12分)已知函数f (x )=tan ⎝ ⎛⎭⎪⎫2x +π4. (1)求f (x )的定义域与最小正周期;(2)设α∈⎝ ⎛⎭⎪⎫0,π4,若f ⎝ ⎛⎭⎪⎫α2=2cos2α,求α的大小.解:(1)由2x +π4≠π2+k π,k ∈Z ,得x ≠π8+k π2,k ∈Z ,所以f (x )的定义域为{x ∈R |x ≠π8+k π2,k ∈Z }.(4分)f (x )的最小正周期为π2.(6分)(2)由f ⎝ ⎛⎭⎪⎫α2=2cos2α,得tan ⎝ ⎛⎭⎪⎫α+π4=2cos2α,即sin ⎝ ⎛⎭⎪⎫α+π4cos ⎝⎛⎭⎪⎫α+π4=2(cos 2α-sin 2α),整理得sin α+cos αcos α-sin α=2(cos α+sin α)(cos α-sin α).(8分)因为α∈⎝⎛⎭⎪⎫0,π4,所以sin α+cos α≠0.因此(cos α-sin α)2=12,即sin2α=12.(10分)由α∈⎝ ⎛⎭⎪⎫0,π4,得2α∈⎝⎛⎭⎪⎫0,π2.所以2α=π6,即α=π12.(12分)17.(13分)设f (x )=6cos 2x -3sin2x . (1)求f (x )的最大值及最小正周期;(2)若锐角α满足f (α)=3-23,求tan ⎝ ⎛⎭⎪⎫45α的值.解:(1)f (x )=6³1+cos2x2-3sin2x=3+3cos2x -3sin2x =23⎝⎛⎭⎪⎫32cos2x -12sin2x +3=23cos ⎝⎛⎭⎪⎫2x +π6+3,(4分) 故f (x )的最大值为23+3.最小正周期T =2π2=π.(6分)(2)由f (α)=3-23,得23cos ⎝⎛⎭⎪⎫2α+π6+3=3-23,故cos ⎝ ⎛⎭⎪⎫2α+π6=-1.(8分) 又由0<α<π2,得π6<2α+π6<7π6,故2α+π6=π, 解得α=512π.(10分)从而tan ⎝ ⎛⎭⎪⎫45α=tan π3= 3.(13分) 18.(13分)已知函数f (x )=2cos ⎝ ⎛⎭⎪⎫x -π3+2sin ⎝ ⎛⎭⎪⎫3π2-x .(1)求函数f (x )的单调减区间;(2)求函数f (x )的最大值并求f (x )取得最大值时的x 的取值集合; (3)若f (x )=65,求cos ⎝ ⎛⎭⎪⎫2x -π3的值.解:f (x )=2cos x cos π3+2sin x sin π3-2cos x=cos x +3sin x -2cos x =3sin x -cos x=2sin ⎝⎛⎭⎪⎫x -π6.(1)令2k π+π2≤x -π6≤2k π+32π(k ∈Z ),∴2k π+2π3≤x ≤2k π+5π3(k ∈Z ),∴单调递减区间为⎣⎢⎡⎦⎥⎤2k π+2π3,2k π+5π3(k ∈Z ).(4分)(2)f (x )取最大值2时,x -π6=2k π+π2(k ∈Z ),则x =2k π+2π3(k ∈Z ). ∴f (x )的最大值是2,取得最大值时的x 的取值集合是{x |x =2k π+2π3,k ∈Z }.(8分)(3)f (x )=65即2sin ⎝⎛⎭⎪⎫x -π6=65,∴sin ⎝⎛⎭⎪⎫x -π6=35.∴cos ⎝ ⎛⎭⎪⎫2x -π3=1-2sin 2⎝⎛⎭⎪⎫x -π6=1-2³⎝ ⎛⎭⎪⎫352=725.(13分)。

【名师一号】-高中语文 综合测试卷4 苏教版必修1

【名师一号】-高中语文 综合测试卷4 苏教版必修1

【名师一号】2014-2015高中语文综合测试卷4 苏教版必修1(时间:150分钟分数:150分)第Ⅰ卷阅读题甲必考题一、现代文阅读(9分,每小题3分)阅读下面的文字,完成1~3题。

慎防基因造成的污染在近代和当代作家里,我认为有两个女作家对生命科学最具洞察力。

一个是19世纪上半叶的玛丽·雪莱。

当时科学初兴,但她已警觉到科学家可能走火入魔,因而写了《科学怪人》。

一个科学家竟然东拼西凑做出了一个人造人。

最后他后悔莫及,和他造的人一起自我灭亡。

“科学怪人”这个名词现在已成了一个通用的隐喻,任何人类以科学手段创造出来的非自然食物,都叫做“科学怪食”。

另一个则是加拿大当代的女诗人和作家玛格丽特·阿特伍德,前几年在基因改造问题闹得很厉害的时候,她以一本《末世男女》把基因移植科技所造成的可怕世界以科幻小说的方式尽现无遗。

对近代科学发展略有所知的都当知道,上个世纪五十年代乃是生命科学发展快速的阶段。

随着1962年DNA双螺旋构造的被发现,基因科学进入了黄金时代。

基因科技有利于遗传性疾病病因的寻找和诊断,基因研究也有利于对生命现象的理解,但科学从来就不是价值中性的事务,科学的使用者是人,而人是个有七情六欲的自私动物。

科学发展后,它也会成为一个体制,一种权力体系。

当科学成了一种权力,科学的滥用、误用甚至科学所造成的公害即难避免。

科学成了一种体制、一种商业、一种权力后,它的自闭和反动最好的例子即是卡逊女士的遭遇。

当年她发表《寂静的春天》,指出除草剂等化学药物造成生态的破坏,于是美国的化学界包括著名的化学教授和化学工业界都对她发动排山倒海的围剿。

幸而当时主政的是肯尼迪政府,至少还有知识和判断力,才对除草剂、杀虫剂等化学药物进行管理。

这显示出,当科学成为一个庞大的商业和教育体制,它就自然而然地成了一种特权,一个恶势力,并走到违反科学精神的方向。

而当代基因科技发迹后所造成的“科学怪食”就是个新兴的话题和论争的焦点。

【名师一号】-高中语文 专题四 综合测试卷 苏教版必修4

【名师一号】-高中语文 专题四 综合测试卷 苏教版必修4

专题四综合测试卷(时间:150分钟分值:150分)第Ⅰ卷阅读题甲必考题一、现代文阅读(9分,每小题3分)阅读下面的文字,完成1~3题。

表人流行词语探微刘峰在近几年的流行新词语中,反映社会多元人群的新词语逐渐增多,其在语言结构、语义表达、产生机制等方面都具有鲜明的特色。

表人流行新词语是流行新词语中的一个小类,表示具有某一共同特征的一类人,具有鲜明的类指化特征。

如“高考移民、宅男”等。

此外,表人流行新词语具有信息浓缩化的特点,用一个词就能表达一般要用几个词、一句话甚至几句话才能表达的语义,更符合语言的经济性原则,也便于人们记忆。

例如,“高富帅”“~控”等。

从语言结构特征看,表人流行新词语可分为两类。

一类以“成群”的方式出现,形成一个个表人流行新词语词群。

例如,~族(蚁族、裸婚族、啃老族),~控(微博控、网购控)等。

每一个词群,都可归纳为一个构词模式。

另一类则以单个词语的形式出现,如“草根”“土豪”等,与第一类词相比,该类流行词语数量较少。

从表达色彩看,大部分表人流行新词语的感情色彩浓厚,具有浓郁的时代气息与时尚感。

很多表人新词语之所以能够流行,很大程度上在于它们极富表达的感情色彩,如讽刺、戏谑等,不一而足。

表人流行新词语的产生途径多种多样。

“闺蜜”是通过简称(闺中密友)及谐音(闺密)两种方式创造出来的,“草根”和“炮灰”是通过借喻产生的“旧词新义”,“粉丝”是音译外来词,并和汉语已有词偶合。

在表人流行新词语中,有两种词语衍生方式非常突出,即词语模造词和借用外来词。

李宇明先生曾指出,当前大多数新产生的词语,都有一个现成的框架背景,这一框架就像是造词模子一样,称之为“词语模”。

词语模能批量生产新词语,并使其所生产的新词语形成词族。

上文所列举的每一个表人流行词语词群,都是由相应的词语模衍生出来的。

词语模造词实际上就是一个类推过程,体现了语言的经济性原则。

汉语创造新词的方式主要有两类:一是利用汉语中现有的构词材料和规则创造新词,二是借用外来词。

【名师一号】2014-2015学年高中数学 模块检测试题 新人教A版必修4

【名师一号】2014-2015学年高中数学 模块检测试题 新人教A版必修4

【名师一号】2014-2015学年高中数学 模块检测试题 新人教A版必修4一、选择题(共10小题,每题5分,共50分)1.若tan(α-3π)>0,sin(-α+π)<0,则α是( ) A .第一象限角 B .第二象限角 C .第三象限角D .第四象限角解析 由已知得tan α>0,sin α<0,∴α是第三象限角. 答案 C2.函数y =2sin(ωx +φ)⎝⎛⎭⎪⎫|φ|<π2的图象如图,则( )A .ω=1011,φ=π6B .ω=1011,φ=-π6C .ω=2,φ=π6D .ω=2,φ=-π6解析 当x =0时,y =1,且|φ|<π2,∴2sin φ=1,∴sin φ=12,∴φ=π6.当x =11π12时,y =0,∴sin ⎝ ⎛⎭⎪⎫11π12ω+π6=0,∴11π12ω+π6=2π,∴ω=2.故ω=2,φ=π6. 答案 C3.将函数y =cos ⎝⎛⎭⎪⎫x -π3的图象上各点的横坐标伸长到原来的2倍(纵坐标不变),再向左平移π6个单位,所得函数图象的一条对称轴为( )A .x =π9B .x =π8C .x =π2D .x =π解析 将y =cos ⎝⎛⎭⎪⎫x -π3的图象上各点的横坐标伸长到原来的2倍,纵坐标不变,得到y =cos ⎝ ⎛⎭⎪⎫12x -π3的图象,再把所得图象向左平移π6个单位,得到y =cos ⎝ ⎛⎭⎪⎫12x -π4的图象. 令12x -π4=k π,k ∈Z ,则x =2k π+π2,k ∈Z . 当k =0时,x =π2.∴y =cos ⎝ ⎛⎭⎪⎫12x -π4的一条对称轴为x =π2.答案 C4.已知a =(-3,2),b =(-1,0),向量λa +b 与a -2b 垂直,则实数λ的值为( ) A.17 B .-17C .-16D.16解析 (λa +b )²(a -2b )=0, ∴λa 2+(1-2λ)a ²b -2b 2=0, ∴13λ+3-6λ-2=0,∴λ=-17.答案 B5.在坐标平面上直线l 的方向向量e =⎝ ⎛⎭⎪⎫-45,35,点O (0,0),A (1,-2)在l 上的正射影分别为O 1、A 1,设O 1A 1→=λe ,则实数λ=( )A .2B .-2 C.115D .-115解析 λ=OA →²e|e |=-2.答案 B6.已知a ,b 是单位向量,a²b =0,若向量c 满足|c -a -b |=1,则|c |的取值范围是( )A .[2-1,2+1]B .[2-1,2+2]C .[1,2+1]D .[1,2+2]解析 将所给向量式两边平方后利用向量数量积的运算律及向量数量积定义求解. ∵a ²b =0,且a ,b 是单位向量, ∴|a |=|b |=1.又∵|c -a -b |2=c 2-2c ²(a +b )+2a²b +a 2+b 2=1, ∴2c ²(a +b )=c 2+1.∵|a |=|b |=1且a ²b =0,∴|a +b |= 2. ∴c 2+1=22|c |cos θ(θ是c 与a +b 的夹角). 又-1≤cos θ≤1, ∴0<c 2+1≤22|c |. ∴c 2-22|c |+1≤0. ∴2-1≤|c |≤ 2+1. 答案 A7.在平行四边形ABCD 中,AC 与BD 交于点O ,E 是线段OD 的中点,AE 的延长线与CD 交于点F .若AB →=a ,AD →=b ,则AF →=( )A.14a +12b B.14a +b C.13a +b D.13a +23b 解析 由题可得△DEF ∽△BEA 且相似比为13,即DF →=13AB →,故AF →=AD →+DF →=AD →+13AB →=b+13a . 答案 C8.已知α∈⎝ ⎛⎭⎪⎫π2,32π,tan(α-7π)=-34,则sin α+cos α的值为( ) A .±15B .-15C.15D .-75解析 ∵tan(α-7π)=-34,∴tan α=-34<0.∵α∈⎝⎛⎭⎪⎫π2,3π2,∴α∈⎝ ⎛⎭⎪⎫π2,π.∴sin α=35,cos α=-45,∴sin α+cos α=-15.答案 B9.已知向量a =(2,sin x ),b =(cos 2x,2cos x ),则函数f (x )=a ²b 的最小正周期是( )A.π2B .πC .2πD .4π解析 f (x )=a²b =(2,sin x )²(cos 2x,2cos x ) =2cos 2x +2sin x cos x =sin2x +cos2x +1 =2sin ⎝ ⎛⎭⎪⎫2x +π4+1. ∴T =2π2=π.答案 B10.已知α,β为锐角,且cos α=110,cos β=15,则α+β的值是( )A.π3B.3π4C.π4D.3π4或π4 解析 由α,β为锐角,且cos α=110,cos β=15,可得sin α=310,sin β=25,且0<α+β<π,∴cos(α+β)=cos αcos β-sin αsin β=-22,故α+β=3π4. 答案 B二、填空题(共4小题,每小题5分,共20分)11.若向量a ,b 满足:(a -b )²(2a +b )=-4,且|a |=2,|b |=4,则a 与b 的夹角等于________.解析 2a 2-a ²b -b 2=-4, ∴a ²b =-4.设a 与b 的夹角为θ,则cos θ=a²b |a |²|b |=-42³4=-12.∴θ=120°. 答案 120°12.已知a =(3,1),b =(sin α,cos α),且a ∥b ,则4sin α-2cos α5cos α+3sin α=________.解析 由题意得3cos α=sin α,即tan α=3, ∴4sin α-2cos α5cos α+3sin α=4tan α-25+3tan α=57.答案 5713.设函数f (x )=3sin ⎝⎛⎭⎪⎫-2x +π4的图象为C ,有下列四个命题: ①图象C 关于直线x =-5π8对称;②图象C 的一个对称中心是⎝ ⎛⎭⎪⎫7π8,0;③函数f (x )在区间⎣⎢⎡⎦⎥⎤π8,3π8上是增函数;④图象C 可由y =-3sin2x 的图象左平移π8得到.其中真命题的序号是________.解析 ∵f ⎝ ⎛⎭⎪⎫-5π8=3sin 3π2=-3,∴①正确;f ⎝⎛⎭⎪⎫7π8=3sin ⎝ ⎛⎭⎪⎫-3π2=3≠0,∴②错误;f (x )=-3sin ⎝⎛⎭⎪⎫2x -π4,令2k π+π2<2x -π4<2k π+3π2,k ∈Z∴k π+3π8<x <k π+7π8,k ∈Z ,∴f (x )的增区间为⎝ ⎛⎭⎪⎫k π+3π8,k π+7π8(k ∈Z ),∴③错误;图象C 可由y =-3sin2x 向右平移π8个单位得到,∴④错误. 答案 ①14.在△ABC 中,D 是AB 边上一点,若AD →=3DB →,CD →=λCA →+μCB →,则λμ的值为________.解析 ∵AD →=3DB →,∴AD →=34AB →,CD →=CA →+AD →=CA →+34AB →=CA →+34(CB →-CA →)=14CA →+34CB →.∴λ=14,μ=34,λμ=13.答案 13三、解答题(共4个小题,15、16、17题12分,18题14分) 15.(12分)已知函数f (x )=2cos 2x2-3sin x .(1)求函数f (x )的最小正周期和值域;(2)若α为第二象限角,且f ⎝⎛⎭⎪⎫α-π3=13,求cos2α1+cos2α-sin2α的值. 解析 (1)∵f (x )=1+cos x -3sin x =1+2cos ⎝⎛⎭⎪⎫x +π3,∴函数f (x )的周期为2π.又∵-1≤cos ⎝⎛⎭⎪⎫x +π3≤1,故函数f (x )的值域为[-1,3]. (2)∵f ⎝⎛⎭⎪⎫α-π3=13, ∴1+2cos α=13,即cos α=-13.∵cos2α1+cos2α-sin2α=cos 2α-sin 2α2cos 2α-2sin αcos α =α+sin αα-sin α2cos αα-sinα=cos α+sin α2cos α,又∵α为第二象限角,且cos α=-13,∴sin α=223.∴原式=cos α+sin α2cos α=-13+223-23=1-222.16.(12分)如图,以Ox 为始边作角α与β(0<β<α<π),使它们终边分别与单位圆相交于点P 、Q ,已知点P 的坐标为⎝ ⎛⎭⎪⎫-35,45.(1)求sin2α+cos2α+11+tan α的值;(2)若OP →²OQ →=0,求sin(α+β).解析 (1)由三角函数定义得cos α=-35,sin α=45,∴原式=2sin αcos α+2cos 2α1+sin αcos α=2cos αα+cos αsin α+cos αcos α=2cos 2α=2²(-35)2=1825.(2)OP →²OQ →=0,∴α-β=π2.∴β=α-π2,∴sin β=sin ⎝ ⎛⎭⎪⎫α-π2=-cos α=35, cos β=cos ⎝ ⎛⎭⎪⎫α-π2=sin α=45.∴sin(α+β)=sin αcos β+cos αsin β =45²45+⎝ ⎛⎭⎪⎫-35²35=725. 17.(12分)已知向量a =(sin θ,-2)与b =(1,cos θ)互相垂直,其中θ∈⎝⎛⎭⎪⎫0,π2.(1)求sin θ和cos θ的值;(2)若5cos(θ-φ)=35cos φ,0<φ<π2,求cos φ的值.解析 (1)∵a ⊥b ,a ²b =sin θ-2cos θ=0,即sin θ=2cos θ.又∵sin 2θ+cos 2θ=1,∴4cos 2θ+cos 2θ=1, 即cos 2θ=15,∴sin 2θ=45.又θ∈⎝ ⎛⎭⎪⎫0,π2,∴sin θ=255,cos θ=55. (2)∵5cos(θ-φ)=5(cos θcos φ+sin θsin φ) =5cos φ+25sin φ=35cos φ, ∴cos φ=sin φ.∴cos 2φ=sin 2φ=1-cos 2φ,即cos 2φ=12.又0<φ<π2,∴cos φ=22.18.(14分)已知函数f (x )=sin(ωx +φ),其中ω>0,|φ|<π2.(1)若cos π4cos φ-sin 3π4sin φ=0,求φ的值;(2)在(1)的条件下,若函数f (x )的图象的相邻两条对称轴之间的距离等于π3,求函数f (x )的解析式;并求最小正实数m ,使得函数f (x )的图象向左平移m 个单位所对应的函数是偶函数.解析 (1)由cos π4cos φ-sin 3π4sin φ=0,得cos π4cos φ-sin π4sin φ=0,即cos ⎝⎛⎭⎪⎫π4+φ=0.又|φ|<π2,∴φ=π4.(2)由(1)得,f (x )=sin ⎝⎛⎭⎪⎫ωx +π4,依题意,T 2=π3,∴T =2π3,∴ω=3.∴f (x )=sin ⎝⎛⎭⎪⎫3x +π4.函数f (x )的图象向左平移m 个单位后所对应的函数为g (x )=sin ⎣⎢⎡⎦⎥⎤x +m +π4,g (x )是偶函数当且仅当3m +π4=k π+π2(k ∈Z ),即m =k π3+π12(k ∈Z ). 从而,最小正实数m =π12.。

名师一号3-4

名师一号3-4
第9页
新课标同步· 必修1 新课标同步 物理·必修 必修
两个以上的力的合成方法:先求出任意两个力的合力, 两个以上的力的合成方法 : 先求出任意两个力的合力 , 再求这个 合力与另一个力的合力,直到把所有的力都合成进去, 合力与另一个力的合力,直到把所有的力都合成进去,最后得到的结果 就是这些力的合力. 就是这些力的合力. 4.如何确定合力的大小和方向 . (1)作图法 作图法 从力的作用点起,沿两个力的方向按同一标度作出两个力 1和 F2 从力的作用点起 , 沿两个力的方向按同一标度作出两个力F 的图示,并构成平行四边形, 的图示,并构成平行四边形,这个平行四边形的对角线的长度按同样的 标度表示了合力F的大小,对角线的方向就是合力的方向, 标度表示了合力 的大小,对角线的方向就是合力的方向,通常可用量 的大小 角器量出合力F与某个力的夹角. 角器量出合力 与某个力的夹角. 与某个力的夹角 作图时要注意: 合力、分力要共点,实线、虚线要分清. 作图时要注意 : ① 合力 、 分力要共点 , 实线 、 虚线要分清 . ② 合 一般用平移法作图) 力、分力的标度要相同,作平行四边形要准确.(一般用平移法作图 分力的标度要相同,作平行四边形要准确. 一般用平移法作图 这种方法求合力,简单、直观,但不够准确,误差较大. 这种方法求合力,简单、直观,但不够准确,误差较大.
第14页
新课标同步· 必修1 新课标同步 物理·必修 必修
典例1:关于合力与分力的说法中正确的是 典例 :关于合力与分力的说法中正确的是( A.合力与分力同时作用在物体上 .
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B.分力同时作用在物体上共同产生的效果与合力单独作用时产生 . 的效果是相同的 C.合力可能大于分力的大小,也可能小于分力的大小 .合力可能大于分力的大小, D.合力与分力是一对平衡力 . 解析:合力的作用效果和它的分力作用效果是相同的, 解析 : 合力的作用效果和它的分力作用效果是相同的 , 它们并不 是同时作用在物体上的.如当物体受到合力作用时,分力是按效果命名 是同时作用在物体上的.如当物体受到合力作用时, 没有施力物体的力是不存在的. 的 , 没有施力物体的力是不存在的 . 如几个分力是同时作用在物体上 则合力是按效果得出的,也不是物体受到的,是不存在的, 的,则合力是按效果得出的,也不是物体受到的,是不存在的,更说不 上是平衡力, 选项是错误的, 、 选项是正确的 选项是正确的. 上是平衡力,故A、D选项是错误的,B、C选项是正确的. 、 选项是错误的 答案: 答案:BC

名师一号高三数学理科二轮复习各专题测试:专题4综合测试题

名师一号高三数学理科二轮复习各专题测试:专题4综合测试题

专题四综合测试题(时间:120分钟满分:150分)一、选择题:本大题共12小题,每小题5分,共60分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.函数f(x)=lgsin错误!的一个增区间为()A.错误!B.错误!C.错误!D。

错误!解析:由sin错误!〉0,得sin错误!<0,∴π+2kπ<2x-错误!<2π+2kπ,k∈Z;又f(x)=lgsin错误!的增区间即sin错误!在定义域内的增区间,即sin错误!在定义域内的减区间,故π+2kπ〈2x-错误!〈错误!+2kπ,k ∈Z。

化简得错误!+kπ〈x<错误!+kπ,k∈Z,当k=0时,错误!〈x〈错误!,故选C.答案:C2.若函数f(x)=sin ax+错误!cos ax(a〉0)的最小正周期为1,则它的图象的一个对称中心为()A.(-错误!,0)B.(-错误!,0)C。

错误!D.(0,0)解析:f(x)=2sin错误!(a>0),∵T=错误!=1,∴a=2π,∴f(x)=2sin错误!,由2πx+错误!=kπ,k∈Z,得x=错误!-错误!,k∈Z,当k=1时,x=13,故错误!是其一个对称中心,故选C.答案:C3.已知函数f(x)=a sin x+a cos x(a<0)的定义域为[0,π],最大值为4,则a的值为()A.- 3 B.-2错误!C.-错误!D.-4解析:f(x)=a sin x+a cos x=错误!a sin错误!,当x∈[0,π]时,x+错误!∈错误!,∴sin错误!∈错误!,由于a〈0,故错误!a sin错误!∈[错误!a,-a],即f (x)的最大值为-a,∴-a=4,即a=-4。

故选D.答案:D4.将函数f(x)=A sin(ωx+φ)+k(A>0,ω>0,0<φ〈π)的图象向右平移错误!个单位,所得曲线的一部分如图所示,则f(x)的解析式为( )A.f(x)=32sin错误!+1B.f(x)=错误!sin错误!+错误!C.f(x)=2sin错误!-错误!D.f(x)=错误!sin错误!+错误!解析:图象平移之前与平移之后的A,ω,k都是相同的,由平移之后的图象可知2A=3,∴A=错误!,k=错误!;T=2×错误!=错误!,∴ω=错误!.设平移后的函数解析式为g(x)=错误!sin错误!+错误!,将错误!代入,得sin错误!=1,∴φ1=2kπ+错误!,k∈Z,取k=0,则φ1=错误!,故g(x)=错误!sin错误!+错误!.将其图象向左平移错误!个单位,得f(x)的解析式为f(x)=32sin错误!+错误!,即f (x )=错误!sin 错误!+错误!。

【名师一号】2018-2019高中语文苏教版必修5 专题测试四

【名师一号】2018-2019高中语文苏教版必修5 专题测试四

专题测试四(分值:150分时间:150分钟)一、语言文字运用(共24分,其中选择题每小题3分)1.下列词语中加点的字,每对读音完全相同的一组是( )A.狙.击/徂.徕大汶.口/抬头纹.经天纬.地/事与愿违.B.角.色/角.度压.岁钱/压.根儿熏陶渐.染/循序渐.进C.坎.坷/调侃.包.饺子/双胞.胎豪放不羁./无稽.之谈D.济.南/接济.梁山泊./停泊.港拈.花惹草/拈.轻怕重解析C项分别读kǎn,bāo,jī;A项jū/cú,wèn/wén,wěi/wéi;B项jué/jiǎo,yā/yà,jiān/jiàn;D 项jǐ/jì,pō/bó,niān/niān。

答案 C2.下列句子中有错别字的一句是( )A.世纪之交,无论是工艺美术行业,还是工艺美术技艺自身的保护和发展,都面临蜕变和再生的考验。

B.可以说,在《中国·1978》这部影片中,除了群体肖像外,大多数个体人物都曾经是那个年代的风流人物。

C.事实上,在即将过去的一年中,无数文化人一直都在努力,将攸长的中国文化长卷向世界展开,让世界重新认识中国文化的浪漫与厚重。

D.进入12月,西班牙的大城小镇都披上了节日盛装。

入夜,街道上为圣诞节装饰的各式彩灯闪闪烁烁,让人感觉圣诞老人的脚步一天天近了。

解析C项“攸长”应为“悠长”。

答案 C3.在下面一段话空缺处依次填入成语,最恰当的一组是( )笔名满天下而原名湮没无闻者,事实上等于________。

人家给咱们介绍一位沈雁冰先生,不如介绍茅盾来得响亮;介绍一位谢婉莹女士,不如介绍冰心来得________。

等到自己也肯公然承认名叫茅盾或冰心的时候,仍不失为行不更名、坐不改姓的好汉。

千秋万岁后,非但真假难辨,而且________。

A.改名换姓大名鼎鼎弄巧成拙B.移花接木如雷贯耳弄巧成拙C.改名换姓如雷贯耳弄假成真D.移花接木大名鼎鼎弄假成真解析第一空根据“笔名满天下而原名湮没无闻”应填“改名换姓”,“移花接木”含有“暗中更换人和物,以假乱真”之意,与前文语境不符;第二空根据沈雁冰之例中有“来得响亮”一词,所以选填“如雷贯耳”最为恰当;第三空由“真假难辨”和上文讲的趋势,填“弄假成真”。

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阶段测评四(SBⅠ Units 13~16)本试卷分第一卷(选择题)和第二卷(非选择题)两部分。共150分,考试时间120分钟。第一卷(选择题)第一部分:英语知识运用(共三节,满分50分)第一节:语音知识(共5小题;每小题1分,满分5分)1.publicA.argueB.customC.popularD.busy2.visitorA.basinB.measureC.thirstyD.cousin3.societyA.scienceB.convenientC.fieldD.believe4.benchA.schoolB.machineC.marchD.character5.uniteA.bridgeB.unitC.serviceD.price答案:1.B2.D3.A4.C5.D第二节:语法和词汇知识(共15小题;每小题1分,满分15分)6.I can ________ some noise while I'm studying, but I can't stand very loud noise.A.put up withB.get rid ofC.have effect onD.keep up with答案与解析:A考查短语辨析。句意:我学习时可以经受住一些吵闹声,但是不能忍受太大的吵闹声。put up with“忍受,容忍”;get rid of“摆脱,消除,去掉”;have effect on“对……有影响”;keep up with“跟上”。由句意可知选A项。7.My work is ________ done. I'll be right with you.A.hour after hourB.now and thenC.more or lessD.more and more答案与解析:C 句意:我的工作差不多做完了,我会陪着你。more or less“差不多,几乎”,符合句意。hour after hour“一小时接一小时地”;now and then“有时,时不时”;more and more“越来越”。8.Stop making so much noise ________ the neighbor will start complaining.A.or elseB.but stillC.and thenD.so that答案与解析:A考查连词辨析。句意:不要吵闹了,否则邻居会抱怨的。or else“要不然,否则”;but still无此用法;and then“然后”;so that“以至于”。由句意可知选A项。9.________ study in No. 4 Middle School?A.Did you used toB.Did you use toC.Do you used toD.Do you use to答案与解析:B 考查used to句型的疑问句形式。句意:你以前在第四中学学习过吗?used to的疑问形式有两种,即did sb. use to do/used sb. to do。本题属于前者。10.Peter ________ come with us tonight, but he isn't sure.A.mustB.mayC.canD.will答案与解析:B 考查情态动词的基本用法。句意Peter也许今晚会跟我们一起来,但是他不确定。must“一定,必须”;may“可能,也许(用于肯定句)”;can“可能(用于否定句或疑问句)”;will“将”。由句意可知选B项。11.—There were already five people in the car, but they managed to take me as well.—It ________ a comfortable journey.A.can'tB.shouldn't beC.must have beenD.couldn't have been答案与解析:D 考查“情态动词+have done”。句意:——车里已经有五个人了,但是他们还是设法带上了我。——那不可能是一次舒适的旅行。can't“不可能”;shouldn't be“不该是”;must have been“(过去)一定……”;couldn't have been“(过去)不可能……”。由句意可知选D项。12.The manager is going on business next week and the company will be left ________ Mike.A.in charge ofB.in the charge ofC.taking charge ofD.taking the charge of答案与解析:B 考查charge的用法。句意:经理下周要出差,公司将由Mike负责。in charge of“负责……(主语是人)”;in the charge of“由……负责(主语是某物或某事)”;take charge of“负责……(主语是人)”;没有take the charge of这种形式。故选B项。13.I can't go swimming with you, I have ________homework and other things to deal with today.A.masses ofB.a great number ofC.a great deal ofD.a great many答案与解析:C 考查词组辨析。句意:我不能跟你去游泳,今天我有许多作业和其他事情要做。A、B、D三项只能修饰可数名词,只有C项可以修饰不可数名词,故选C项。14.—Y ou should pay me 100 yuan for the camera ________.—I shall pay you 80 yuan for it ________.A.at most; at leastB.for the most; for the leastC.at least; at mostD.for least; for most答案与解析:C 考查情景识别和短语辨析。句意:——你买这部照相机至少得付给我100元。——我最多付给你80元。从语境可得知是商店店主与顾客之间的讨价还价。atleast“至少”;at most“最多”。由句意可知选C项。15.I don't think he could have done such a stupid thing last night, ________.A.do IB.had heC.has heD.did he答案与解析:D 考查反意疑问句。句意:我认为昨晚他不会做出如此愚蠢的事情,对吗?这是否定转移的句子,在这个句子中,陈述部分主语是第一人称I,故反意疑问部分应与宾语从句一致。couldn't have done表示“(过去)不可能已经做了……”,又由last night可推知是一般过去时态,所以反意疑问部分用did he。16.He ________ have done this job. So he is sure to do it well.A.doB.doesC.doneD.did答案与解析:B 考查强调句。句意:他确实做过这份工作,因此他有把握做好。句子主体时态是现在时,主语是第三人称单数,故用does。17.Listen carefully ________ you will miss the key points of the speech.A.andB.soC.or elseD.however答案与解析:C 考查祈使句+and/or/or else+陈述句。句意:仔细听,否则你就会错过演讲的关键内容。and“而且”;so“因此”;or else“否则”;however“然而”。由句意可知选C 项。18.Tony is going camping with ________ boys.A.little two otherB.two little otherC.two other littleD.little other two答案与解析:C 考查多个形容词作定语时的顺序。句意:Tony将跟其他两个小男孩一起去宿营。由“限定、描绘、大小、长短、形状、新旧、颜色、国籍、材料、作用、类别”的公式可知C项符合句意。19.Poor boy! His ________ looks and ________ hands suggested he was very afraid.A.frightful; tremblingB.frightened; tremblingC.frightening; trembledD.frightened; trembly答案与解析:B 考查-ed形容词和-ing形容词。句意:多可怜的孩子啊!他惊恐的表情和颤抖的手显示他非常害怕。第一空填frightened,意为“感到害怕的”;第二空填trembling“颤抖的”,故选B项。20.Which shirt do you like ________, the white one or the blue one?A.betterB.goodC.bestD.much答案与解析:A考查副词的比较级。句意:你更喜欢哪一件衬衫,白的那件还是蓝的那件?因为是两者相比较,故用比较级,选A项。第三节:完形填空(共20小题;每小题1.5分,满分30分)In my memory, playing the shuttlecock game was one of my favorite things during my childhood. The shuttlecocks I played were not used in the badminton game; they were just __21__ for playing by themselves.My hometown is in northeast China where the winter is very __22__—almost five to six months. __23__, playing the shuttlecock outside was the main game in the winter. __24__ I liked to play this kind of game very much, the shuttlecock became my good friend who always __25__ me in the long winter.As a __26__ of fact, this game was very simple. It just was played by a person who __27__ the shuttlecock with his or her foot and __28__ it from dropping down on the ground as long as possible. __29__ on different interests, the player could kick the shuttlecock with different parts of his or her foot.Sometimes we were __30__ into two teams, and each team had one, two, or more persons. Then we had a __31__ to see which team could keep playing for a long time. The team that__32__ keep playing much longer would win.It was __33__ to make a shuttlecock by hand. At that time, I really didn't know __34__ I could buy a shuttlecock. So I __35__ made them by hand and by myself. I used chicken feathers to make the shuttlecock. Particularly, I __36__ to use cock feathers because of their __37__. Sometimes, I also used some thread, which was made of hemp (大麻), flax (亚麻), or some__38__ things to make the shuttlecock, if I didn't find chicken feathers.For the small metal base, I usually chose two or three ancient Chinese coins with a __39__ in the middle. I just put the chicken feathers into the hole of the base, and then __40__ them together very well with thread. This, a simple shuttlecock was ready.21.A.called edC.askedD.sent22.A.cold B.shortC.warmD.long23.A.However B.OtherwiseC.ThereforeD.Besides24.A.Because B.ThoughC.WhileD.Unless25.A.attended fortedC.persuadedD.accompanied26.A.event B.thingC.matterD.affair27.A.threw B.kickedC.pushedD.pulled28.A.prevented B.protectedC.pretendedD.presented29.A.Depending B.InsistingC.StickingD.Basing30.A.classified B.separatedC.dividedD.distributed31.A.meeting B.talkC.fightD.match32.A.could B.shouldC.oughtD.must33.A.hard B.easyC.impossibleD.necessary34.A.there B.whenC.whereD.how35.A.always B.seldomC.hardlyD.never36.A.enjoyed B.suggestedC.preferredD.considered37.A.length B.weightC.sightD.colors38.A.familiar B.particularC.similarD.curious39.A.hole B.pictureC.wordD.square40.A.placed B.putidD.tied答案与解析:21.B 根据上文看,此处所讲的是毽子的用途,所以用be used for。22.D 根据下文的5~6个月的时间来看,冬天在作者所居住的东北地区很漫长。23.C however“然而”;otherwise“否则”;therefore“因此”;besides“除此之外”。根据上下文的语义判断,为递进关系,所以用“因此”。24.A喜欢这种游戏是原因,毽子成了她的好朋友是结果,所以用because。25.D accompany“陪伴”,由于毽子是她的好朋友,所以在漫长的冬日“陪伴”着她。26.C as a matter of fact 是固定短语,意为“事实上”。27.B 众所周知,毽子是用来“踢”的,下文的the player could kick the shuttlecock 处也有提示。28.A我们知道踢毽子时就是防止毽子落到地上,prevent...from...“防止……做……”;而protect 的意思是“保护”。29.A depend on“依靠”;insist on“坚持”;stick 不能和on 连用;based on“以……为基础”。根据语义判断,此处为“依靠不同的兴趣”。30.C be divided into...“被分成……”,可根据后面的two teams 判断。31.D 根据下文的would win 判断,他们分成两组,然后进行“比赛”。have a match“进行比赛”。32.A此处的could 是情态动词,表示“能力”,能够踢得更长的那一组将会赢得比赛。33.B 下面讲述毽子的制作方法,作者自己就会制作,由此推断制作毽子很“容易”。34.C 根据语义判断作者不知道在什么地方能买到毽子。35.A由于制作毽子很容易,又不知道在哪里能买到,所以作者“总是”自己制作。36.C enjoy, suggest, consider 后都要接动词的-ing 形式,prefer to do “更喜欢做……”。37.D 公鸡的羽毛五颜六色。这也是作者喜欢用公鸡的羽毛制作毽子的原因。38.C familiar“熟悉的”;particular“特别的”;similar“类似的”;curious“好奇的”。作者除了使用羽毛外,还使用了像大麻、亚麻线或“类似的”东西制作毽子。39.A中国的古铜钱中间有一个“孔”。40.D tie...together“紧紧地绑在一起”。place, put 和lay 都是“放”的意思,不合句意。第二部分:阅读理解(共25小题。第一节每小题2分,第二节每小题1分;满分45分) 第一节:阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。AA Tight SituationSometimes funny memories are the most special way to remember a beloved lover. It helps take away some of the feeling of loss. Before he passed away, my husband loved to share this story with our friends. Now, it makes a smile to share this story with you.Our neighbor's son was getting married in 1971 at a church, and we were invited. We immediately rushed out of the store, and I bought a nice pink dress with a jacket. The dress was a little tight, but I had a month before the June 30 wedding and I would lose a few pounds.June 29 came and, of course, I had not lost a single pounds; in fact, I had gained two. But, I thought a new girdle (收腹健美裤) would solve my problem. So on our way to the wedding, westopped once again at the store. I ran in and told the clerk I needed a size large girdle.The clerk found the box with the described girdle, marked “L”, and asked if I would like to try it on. “Oh, no, large will fit just right. I won't need to try it on.”The next morning was hot, so I waited to get dressed until about forty-five minutes before time to go. I opened the girdle box only to find a new $49.95 girdle in a size small. Since it was too late to find another one and the dress wouldn't fit right without a girdle, a fight broke out between me and the girdle. Have you ever tried to shake twenty pounds of potatoes into afive-pound bag? Finally, my husband, laughing like crazy, got hold of each side and shook me down into it, and I was ready to go.As we walked into the church, he asked if I could make it. Now, he was getting worried because I was breathing funny. I told him that it would last one hour, twenty-two minutes and eight-and-one-half seconds—the minister blessed everything except my girdle!My knees were blue and my legs lost all the feeling. My husband was asking questions and trying to comfort me.As soon as the minister pronounced them married, I rushed out with my husband. “Please, just get me out of here!” I said.We ran out to our car, and once there he opened the front and back passenger doors against the next car. Right there, before God, human and the wedding party, I took off that girdle. When the girdle flew out of my hand and landed under the car next to ours, my husband was laughing so hard and we drove away.Over the years, he and I had often wondered what the people of that church thought the next morning when they found $49.95, size small girdle in their parking lot.41.When she was telling the story, she ________.A.was sorry for her husband's deathB.was happy to share her funny memoriesC.was wondering who had picked up the girdleD.still couldn't forget the trouble on that day答案与解析:B 由文中第一段最后一行“Now, it makes a smile to share this story withyou.”可知B项为最佳选项。42.She still bought the tight pink dress, because she thought ________.A.she would save some moneyB.she would gain a few poundsC.she would lose some weightD.she looked thinner in the dress答案与解析:C 由第二段最后一句话“...but I had a month before the June 30 wedding andI would lose a few pounds.”可知C项为最佳选项。43.Which statement is TRUE according to the story?A.She changed the girdle for a larger size.B.They tried hard to pour lots of potatoes into a small bag.C.She put on the dress without the girdle in the end.D.She managed to put on the girdle with her husband's help.答案与解析:D 由文章第五段最后一句“Finally, my husband, laughing like crazy, got hold of each side and shook me down into it...”可知D项为最佳答案。44.The title “A Tight Situation” really means ________.A.she was dressed in a tight girdleB.she dressed herself in a limited timeC.she got herself embarrassedD.the wedding lasted longer than she expected答案与解析:C 由全文内容可知。45.The writer's purpose of writing this story is ________.A.to tell an interesting experienceB.to prove her husband's loveC.to describe her tight girdleD.to describe her unspeakable feeling答案与解析:A文章中所讲的故事是作者和丈夫共同经历的有趣的事,当丈夫过世之后,她用这个故事来表达对丈夫的怀念之情,而其他三项都不对,故只能选A项。B“Can I see my baby?” asked the happy new mother. The bundle (婴儿包) was placed in her arms and when she moved the fold of cloth to look upon his tiny face, she gasped—the baby had been born without ears. Time, however, proved that the baby's hearing was perfect except his appearance.One day when he rushed home from school and threw himself into his mother's arms, he cried out bitterly, “A boy, a big boy...called me—a freak.” She sighed, knowing that his life was to be endless of heartbreaks.He grew up, handsome for his misfortune. A favorite with his fellow students,he might have been class president,but for that. He developed a gift for literature and music.The boy's father had a talk with the family doctor. “Could nothing be done?”“I believe we could graft (移植) on a pair of outer ears, if they could be donated (捐献),” the doctor decided. So the search began for a person who would make such a sacrifice (牺牲) for a young man. Two years went by. Then, “Y ou're going to the hospital, son. Mother and I have someone who will donate the ears you need. But it's a secret.” said the father.The operation was a brilliant success. His talents blossomed into genius. School and college became a series of successes. Later he married and entered the diplomatic (外交) service. “But I must know!” he urged his father. “Who gave so much for me? I could never do enough for him.”“I do not believe you could,” said the father, “but the agreement was that you are not to know... not yet.” The years kept the secret, but the day did come... one of the darkest days that ever passed through a son. He stood with his father over his mother's casket (棺材). Slowly and tenderly, the father stretched forth a hand and raised the thick, reddish-brown hair to let out the secret.46. The story is mainly about ________.A. how a boy had new ears through an operationB. what a devoted parent privately did for the childC. how a disabled boy turned into a useful personD. why a donator made a sacrifice to a bright boy答案与解析:B 主旨大意题。综合全文可知B项包含了文章的主要意思。47. The underlined word “freak” in Paragraph 2 is the closest in meaningto“________”.A. slow-acting personB. ugly-looking childC. badly-behaved studentD. strangely-shaped creature答案与解析:D 由第一段知小男孩没有耳朵,外貌奇怪被人讥笑为“怪物”。48. What can be inferred from the passage?A. The agreement was between the donator and the family.B. The boy was so popular that he was made class president.C. Finally the boy came to know who the donator was.D. The mother donated her ears to her son after she died.答案与解析:C 由最后一段最后一句可知C项正确。49. What moral lesson can we draw from this reading?A. Real love lies in what is done unknown rather than what is done known.B. It is up to parents to help their children heart and soul.C. True beauty lies only in the heart not in appearance.D. It is a virtue for young generations to learn to be grateful.答案与解析:A母亲为不增加儿子的心理负担而对自己捐出耳朵的事保密,表明“大爱无声”,A项符合句意。CA.No powerB.Picture noiseC.Does not playD.Cannot SKIP or SEARCH答案与解析:A细节理解题。由文章第一栏叙述,在“No power”的情况下,需要“Check if the power cable has been properly connected to the power outlet.”可以看出,“failing to connect a cable”可能出现的后果是“No power”,由此可以得出答案为A项。51.According to the document, the likely effect of dampness is that ________.A.the disc will not playB.the unit might explodeC.STOP will be displayedD.there will be picture noise答案与解析:A细节理解题。由文章第二栏叙述,在检查出现“Doesn't play”情况的原因时,有一句话“There may be small amount of water formed by dampness inside the unit.”由此可以看出,“dampness”可能出现的后果是“the disc will not play”。由此可以得出答案为A项。52.What is the best title for the document?A.Getting StartedB.Learning the BasicsC.Trouble-shootingD.Exploring Y our Choices答案与解析:C 归纳标题题。通读全篇,我们可以看出这是一篇关于如何解决机器故障的文件。由此可以得出答案为C项。DSelf-esteem (自尊心) is all about how much we feel valued, loved, accepted, and thought well of by others and how much we value, love, and accept ourselves. People with healthyself-esteem are able to do better in school and find it easier to make friends. They tend to have better relationships with others, feel happier, find it easier to deal with mistakes and failures, and are more likely to stick to something until they succeed. People with low self-esteem may feel as if no one will like them or accept them or that they can't do well in anything.The following ways may help you improve your self-esteem.Try to stop thinking negative thoughts about yourself. If you're used to focusing on your shortcomings, start thinking about positive aspects of yourself that outweigh them. It is good to aim high, but your goals for yourself should be within reach. That's why you should set practical goals and never expect the impossible. Mistakes are part of learning, so view mistakes as learning opportunities. Accept that you make mistakes because everyone does. Also, you should recognize what you can change and what you can't. If you realize that you're unhappy with something about yourself that you can change, start today. If it's something you can't change (like your height), start to work toward loving yourself the way you are. Feeling like you're making adifference and that your help is valued can do wonders to improve your self-esteem. So don't hesitate to make a contribution. Y ou can lend a hand to a classmate who's having trouble, help clean up your neighborhood, or volunteer to do some other things.Self-esteem plays a role in almost everything you do. It's never too late to build healthy, positive self-esteem. It takes some work, but it's a skill you'll have for life.53. The underlined word “them” in Paragraph 3 refers to “________”.A. your classmatesB. your shortcomingsC. your strong pointsD. your goals答案与解析:B 代词指代题。作者在此处给出了培养自尊心的第一个方法,即尽量不要总想着自己的缺点,应该想一想自己的优点,这些优点在此时比缺点更重要,因为它们能给你自信,所以此处的“them”指代缺点。54. We can infer from the passage that ________.A. the old tend to have healthier self-esteem than the youngB. we should build healthy, positive self-esteem when youngC. there are more people with low self-esteemD. it is not easy to build healthy self-esteem答案与解析:D 推理判断题。由文章最后一句可知培养健康、积极的自尊心需要我们付出努力,但这却是我们生活中必不可少的一项技能,因此选D项。55. The passage is mainly about ________.A. how people improve their self-esteemB. what self-esteem meansC. what people with low self-esteem are likeD. what people with healthy self-esteem are like答案与解析:A主旨大意题。第二段The following ways may help you improve yourself-esteem.是主题句,引出了主要内容——如何培养健康、积极的自尊心。56. How many ways of improving your self-esteem are mentioned in the passage?A. 5.B. 6.C. 7.D. 8.答案与解析:A细节判断题。文章的第三段讲了提高自尊心的几种方式:第一种:try to stop thinking negative thoughts about yourself;第二种:set practical goals and never expect the impossible;第三种:view mistakes as learning opportunities;第四种:recognize what you can change and what you can't;第五种:don't hesitate to make a contribution。EIncreasingly, Americans are becoming their own doctors by going online to diagnose their symptoms, order home health tests or medical devices, or even self-treat their illnesses with drugs from Internet pharmacies (药店). Some avoid doctors because of the high cost of medical care, especially if they lack health insurance. Or they may stay away because they find it embarrassing to discuss their weight, smoking ,alcohol consumption or couch potato habits. Patients may also fear what they might learn about their health, or they distrust physicians because of negative experiences in the past. But playing doctor can also be a deadly game.Every day, more than six million Americans turn to the Internet for medical answers—and most of them aren't nearly sceptical enough of what they find. A 2002 survey by the Pew Internet & American Life Project found that 72 percent of those surveyed believe all or most of what they read on health websites. They shouldn't. Look up “headache”, and the chances of finding reliable and complete information, free from a motivation for commercial gain, are only one in ten, reports an April 2005 Brown Medical School study. Of the 169 websites the researchers rated, only 16 scored as “high quality”. Recent studies found faulty facts about all sorts of other disorders, causing one research team to warn that a large amount of incomplete, inaccurate andeven dangerous information exists on the Internet.The problem is most people don't know the safe way to surf the Web. “They use a search engine like Google, get 18 trillion choices and start clicking. But that's risky, because almost anybody can put up a site that looks authoritative (权威的), so it's hard to know if what you're reading is reasonable or not,” says Dr. Sarah Bass from the National Cancer Institute.57.According to the text, an increasing number of Americans ________.A.are suffering from mental disordersB.turn to Internet pharmacies for helpC.like to play deadly games with doctorsD.are sceptical about surfing medical websites答案与解析:B 由文章第一段第一句可知B项正确。58.Some Americans stay away from doctors because they________.A.find medical devices easy to operateB.prefer to be diagnosed online by doctorsC.are afraid to face the truth of their healthD.are afraid to misuse their health insurance答案与解析:C 由第一段内容可推知。59.According to the study of Brown Medical School, ________.A.more than 6 million Americans distrust doctorsB.only 1/10 of medical websites aim to make a profitC.about 1/10 of the websites surveyed are of high qualityD.72% of health websites offer incomplete and faulty facts答案与解析:C 由第二段中的“...are only one in ten, reports an April 2005 Brown Medical School study.”可知。60.Which of the following is the author's main argument?A.It's cheap to self-treat your own illness.B.It's embarrassing to discuss your bad habits.C.It's reasonable to put up a medical website.D.It's dangerous to be your own doctor.答案与解析:D 纵观全文可知作者对患者的自我诊断是持否定态度的。第二节:根据对话内容,从对话后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。A: Hello! This is Li Mei Calling from Jilin. May I speak to Carla?C: Just a moment, please. __61__B: Hello?A: Hi, Carla! This is Li Mei calling from Jilin. How are you?B: Oh, hi, Li Mei! How nice to hear your voice! I'm fine, thank you.A: Thank you so much for giving me such a lovely time in Trindad.B: __62__ I hope you can come again some day!A: I'd love to! I wonder, though, if you are interested in visiting me during the Spring Festival this year. __63__B: Oh, I'd love to, but I don't know if I will be free then. What time of year is it?A: __64__ But this year it's at the beginning of February.B: I'd love to come. I'll try to find out if I can take off work then. It's very kind of you to invite me!A: Oh, don't mention it! I hope you can come! Say hello to Hari for me! I hope he can come to China with you.B: That would be fun! Thanks a lot for calling! __65__A: OK, great! Have a good day!B: Thanks, you too, bye!A: ByeA.Oh, sorry, he isn't here at the moment.B.I'll get her for you.C.It was a pleasure having you here.D.It is always the same each other.E.I'd love to show you one of our Chinese festivals.F.I'll let Hari know you called.G.It's different every year.答案: 61.B 62.C 63.E 64.G 65.F第二卷(非选择题)第三部分:写作(共三节,满分55分)第一节:单词拼写(共10小题;每小题1分,满分10分)根据下列句子及所给汉语注释,在横线上写出空缺处各单词的正确形式(每空只写一词)。66. It's no use ____________(遗憾)what you have done.67. It ____________(有希望)to be fine tomorrow.68. He said he wasn't prepared to ____________(讨价还价).69. Is it ____________(方便)for you to pick her up at ten o'clock?70. I think ____________(地理)is one of the subjects that I love.71. ____________(自然), as a beginner I'm not a very good driver.72. On hearing the good news, they shouted ____________(兴奋).73. There used to be ____________(长凳)in these schools.74. He looked as if he needed a ____________(刮脸).75. I didn't really want to go to see the film but he ____________(坚持) we should go.答案:66.regretting 67.promises 68.bargain 69.convenient70.geography 71.Naturally 72.excitedly 73.benches74.shave 75.insisted第二节短文改错(共10小题;每小题1.5分,满分15分)Li Hua,It's time to say goodbye. It's time to recall those days when we76.__________spend together. Y ou are the very person who give me a hand when77.__________ necessary. Y ou are most considerate person who knows exactly78.__________what I need. Remember that night two years before? When I suddenly79.__________fell ill, that was you who carried me on your back to a nearby hospital.80.__________Y ou took good care me while I was having an injection. Later, you81.__________managed to help me in my lessons. Without your help, I would82.__________have failed in the examination. I still had hundreds of stories to83.__________share with you. I still have thousands of blessings for you. May all84.__________your dreams come truly! May our friendship last till the end of the universe.85.__________ Y ours,Wang Ping答案:76.去掉when 77.give→gives78.在most 前加the 79.before→ago80.that→it 81.在care 后加of82.in→with 83.had→have84. 85.truly→true第三节:书面表达(满分30分)据报道,某校的几个学生在宿舍开了一家超市,由于物品价格低廉,深受欢迎。学生对此议论纷纷,褒贬不一。请你根据下表提示,用英语写一篇短文。2.词数:100左右。3.开头已给出,但不计入总词数。Recently we've had a heated discussion on whether it's acceptable to start a supermarket in the dormitory.________________________________________________________________________________________________________________________________________________ 范文:Recently we've had a heated discussion on whether it's acceptable to start a supermarket in the dormitory.Some students are in favour of this idea, saying that it's convenient for students' daily life. Meanwhile, it can help reduce financial burdens. Most important of all, these students can develop a sense of survival.Other students, on the other hand, are against doing so. In their opinion, it disturbs the students in and around the dormitory. Besides, it may have a negative effect on their own study. As far as I'm concerned, they can stick to their choice so long as they obey the school rules and concentrate their attention on study.21。

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