巩固练习-B2U1知识点.pptx
高中数学选修2-1知识点+例题+习题(师)(K12教育文档)

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12 高中数学选修2-1复习 第一章:命题与逻辑结构知识点:1、命题:用语言、符号或式子表达的,可以判断真假的陈述句.真命题:判断为真的语句.假命题:判断为假的语句.2、“若p ,则q ”形式的命题中的p 称为命题的条件,q 称为命题的结论.3、对于两个命题,如果一个命题的条件和结论分别是另一个命题的结论和条件,则这两个命题称为互逆命题。
其中一个命题称为原命题,另一个称为原命题的逆命题.若原命题为“若p ,则q ”,它的逆命题为“若q ,则p ”。
4、对于两个命题,如果一个命题的条件和结论恰好是另一个命题的条件的否定和结论的否定,则这两个命题称为互否命题.中一个命题称为原命题,另一个称为原命题的否命题.若原命题为“若p ,则q ”,则它的否命题为“若p ⌝,则q ⌝”.5、对于两个命题,如果一个命题的条件和结论恰好是另一个命题的结论的否定和条件的否定,则这两个命题称为互为逆否命题。
其中一个命题称为原命题,另一个称为原命题的逆否命题. 若原命题为“若p ,则q ”,则它的否命题为“若q ⌝,则p ⌝”.()1两个命题互为逆否命题,它们有相同的真假性;()2两个命题为互逆命题或互否命题,它们的真假性没有关系.7、若p q ⇒,则p 是q 的充分条件,q 是p 的必要条件.若p q ⇔,则p 是q 的充要条件(充分必要条件).8、用联结词“且”把命题p 和命题q 联结起来,得到一个新命题,记作p q ∧.当p 、q 都是真命题时,p q ∧是真命题;当p 、q 两个命题中有一个命题是假命题时,p q ∧是假命题.用联结词“或”把命题p 和命题q 联结起来,得到一个新命题,记作p q ∨.当p 、q 两个命题中有一个命题是真命题时,p q ∨是真命题;当p 、q 两个命题都是假命题时,p q ∨是假命题.对一个命题p 全盘否定,得到一个新命题,记作p ⌝.若p 是真命题,则p ⌝必是假命题;若p 是假命题,则p ⌝必是真命题.9、短语“对所有的”、“对任意一个"在逻辑中通常称为全称量词,用“∀”表示.含有全称量词的命题称为全称命题.全称命题“对M 中任意一个x ,有()p x 成立”,记作“x ∀∈M ,()p x ”.短语“存在一个"、“至少有一个"在逻辑中通常称为存在量词,用“∃”表示.含有存在量词的命题称为特称命题. 特称命题“存在M 中的一个x ,使()p x 成立”,记作“x ∃∈M ,()p x ”.10、全称命题p :x ∀∈M ,()p x ,它的否定p ⌝:x ∃∈M ,()p x ⌝.全称命题的否定是特称命题.3考点:1、充要条件的判定 2、命题之间的关系典型例题:★1.下面四个条件中,使a b >成立的充分而不必要的条件是A .1a b >+B .1a b >-C .22a b >D .33a b > ★2.已知命题P :∃n ∈N,2n >1000,则⌝P 为A .∀n ∈N,2n ≤1000B .∀n ∈N,2n >1000C .∃n ∈N,2n ≤1000D .∃n ∈N,2n<1000 ★3."1""||1"x x >>是的A .充分不必要条件 B.必要不充分条件 C .充分必要条件 D .既不充分又不必要条件【基础训练A 组】一、选择题1.下列语句中是命题的是( )A .周期函数的和是周期函数吗?B .0sin 451=C .2210x x +->D .梯形是不是平面图形呢?解析:B 可以判断真假的陈述句2.在命题“若抛物线2y ax bx c =++的开口向下,则{}2|0x ax bx c φ++<≠”的逆命题、否命题、逆否命题中结论成立的是( )A .都真 B .都假 C .否命题真 D .逆否命题真 解析:D 原命题是真命题,所以逆否命题也为真命题3.有下述说法:①0a b >>是22a b >的充要条件。
北师大版高中数学选修2-1第一章《常用逻辑用语复习小结》课件

全称命题的否定是特 称命题,特称命题的 否定是全称命题.
江西省202X年春季延期开学期间线上教育课程
常用逻辑用语复习小结
江西省| 赣教云平台| 高中数学| 在线课堂
【全称量词与存在量词】
例4 已知函数gx log2 x m,
解:1由题对任意的x 1,4,
1对任意的x 1,4,使得gx 0成立, 使得gx 0成立,
常用逻辑用语
命题
充分条件与 必要条件
全称量词与 存在量词
了解命题的逆命题、否 命题与逆否命题,会分 析四种命题的相互关系
理解充分条件、必要条 件与充要条件的意义
理解全称量词与存在 量词的意义,能正确 地对含有一个量词的 命题进行否定
逻辑联结词 “且”“或”“非”
通过数学实例,了解逻 辑联结词“且”“或”“非” 的含义
则求实数m的取值范围.
等价转化——借助全称量词与 存在量词对条件进行转化
江西省202X年春季延期开学期间线上教育课程
常用逻辑用语复习小结
江西省| 赣教云平台| 高中数学| 在线课堂
【逻辑联结词“且”“或”“非”】
1.真假判定 p且q:有假则假,p或q:有真则真,p:真假相反;
2.集合观点 交集:p且q,并集:p或q,补集:p.
常用逻辑用语复习小结 【课堂小结】
命题
江西省| 赣教云平台| 高中数学| 在线课堂
等价转化的思想
常用逻辑用语
充分条件与 必要条件
全称量词与 存在量词
逻辑联结词 “且”“或”“非”
江西省202X年春季延期开学期间线上教育课程
正确地使用常用逻辑用语,不仅是学习 这一部分的内容,而且还需要在今后的 学习中,通过不断地正确使用常用逻辑 用语,加深对常用逻辑用语的认识.
B1B2基础知识复习巩固

必修1基础知识复习巩固一、单句语法填空。
【温馨提示:请根据提示词或句意填空。
】1. I ____________ (entire) forget what happened to me in the incident.2. He took a deep breath (calm) himself down.3. With a local guide (lead) the way, they had no trouble (get) out of the forest.4. The shy girl found difficult to express herself clearly.5. She had her leg (break), and is in hospital now.6. It was not until I told him he knew the truth.7. While (walk) along the street, I met an old friend of mine.9. Every minute should be made use of ________(learn) English well.10. The reason why he didn’t come to school was _______ he was seriously ill.11. He was ________________ (determine) to overcome all the difficulties.12. It was _________ bad weather that I had to stay at home.二、单句改错【温馨提示:请注意规范答题哦!】1.The sports meet had to be put off because of it rained heavily.2. It was because of the bad weather the football match had to be put off.3. I happened see her on my way to work.4. He is easy to get along, so everyone likes talking to him.5. According with the survey, half of the men in that village smoke.6. As far as he concerned, he can’t afford such an expensive car.7. I found it necessary discuss the problem further.8. She walked out of the building, with a lot of people followed her.9. Basing on his knowledge and experience, his decision is accepted by us.10. General speaking, woman cry more easily than men.11. He has devoted his whole life to benefit mankind.12. You were lucky to escape punished.三、原句再现。
B2U1知识梳理构建案

Book2 Unit 1知识梳理构建案【Learning Aims】1. Grasp the usage of 4 words and 2 phrases and 2 sentence patterns in the unit.2. Learn to master the usage of Restrictive and non- Restrictive attributive clauses.I.重点单词:1.remain vi.剩余; 留下;系动词:保持,仍是(后面+形容词、介词短语、分词、名词等作表语)n.[pl] remains 剩余物,遗址;(1) Very little of the house remained after the fire.大火之后,这所房子所剩无几。
(2) She remained standing / seated for a good hour. 她整整站/坐了一个钟头。
(3)The problems remain to be solved. 这几个问题尚待解决。
【拓展】remaining adj. 剩下的(作前置定语);left剩下的(作后置定语);2. wonder n.[C] 奇迹;奇观;[U]惊奇,惊叹vt. 想知道,对…感到惊奇(1) It is a wonder (that) the child came through without a scratch.这孩子竟能安然无恙地脱险,真是奇迹。
(2)(It’s) no wonder you can’t sleep when you eat so much.你吃那么多,难怪睡不着。
(3)I wonder who he was, where he was from and why he came.我想知道他是谁,从哪里来,为什么来。
3. doubt v. 怀疑,疑惑n. 怀疑,疑惑(1) I don’t doubt that he’s a brilliant scientist. 我相信他是个出色的科学家。
B2U1精讲和练习

Unit 1 Cultural relics核心单词 重难突破1.survive vt. 比……活得长;幸免于;从(困境中)挺过来 vi. 幸免;幸存;生还 A survive B by... A 比B 活得长…… survive sth. 幸免于;从……中挺过来/活过来survive on 依靠……生存下来survive from 从……中存活下来;流传下来survivor n . 幸存者survival n . [U] 幸存;[C]残存物 2.amaze vt. (affect with wonder )使吃惊;惊讶 (1)amazing adj . 令人吃惊的 amazed adj . 惊奇的;惊讶的 be amazed at/by sth. 对……感到惊讶 be amazed to do sth. 因做某事而感到惊讶(2)amazement n . 惊讶,吃惊;惊异 in amazement 惊奇地to one's amazement 令某人惊讶的是3.select vt. 挑选;选择select sb. to do sth. 挑选某人做某事 select sb./sth. as/to be... 挑选某人/物作……selection n . 挑选;选择 4.design vt.设计;计划;构思;意图 n .设计;图案;构思 design sth. for 设计某物作……用途 by design 故意地,蓄意地⎭⎬⎫be designed to do sth.be designed for sth.be designed as sth.为了某目的;用作某物 5.fancy adj.奇特的;异样的 vt.想像;设想;爱好 n .(捕风捉影的)空想;(随心所欲的)幻想;爱好⎭⎬⎫fancy... to be...fancy... as...认为……是……fancy (sb.) doing sth. 想像(某人)做某事have a fancy for sth. 喜欢某事物 catch/take sb.'s fancy 合某人心意;吸引某人take a fancy to sb./sth. 喜欢上/爱上某人/物6.decorate vt.装饰;装修decorate sth. with... 用……来装饰……decoration n . 装饰品,装饰图案7.remove vt. & vi. 移动;搬开;搬家;脱掉;摘掉;消除;撤职;开除remove sb. from school/office 开除;勒令某人退学/辞职 remove... from... 把……从……移走remove one's doubt/trouble 消除某人的疑虑/烦恼 remove from... to... 从……搬到……8.worth prep. 值得的;相当于……的价值 n. 价值;作用 adj. [古]值钱的worthbe worth +n.值得……,值……be worth doing值得被做worthwhile It's worthwhile doing/to do...值得做……worthybe worthy of+n.值得……be worthy of being done值得被做be worthy to be done值得被做[修饰,不可用 very 修饰;和worthwhile 既可作表语又可作定语。
数学人教B版选修2-1课件:第一章 1.1.2 量词

知识点二 存在量词、存在性命题 1.概念 短语“ 存在一个 ”“ 至少有一个”在陈述中表示所述事物的个体或部分,在 逻辑中通常叫做 存在 量词,并用符号“ ∃ ”表示.含有存在量词的命题,叫做 存在性命题 .
2.表示 存在性命题“存在M中的元素x,使p(x)成立”可用符号简记为 ∃x∈M,p(x), 读作“存在M中的元素x,使p(x)成立”. 3.存在性命题的真假判定 要判定一个存在性命题是真命题,只需在集合M中找到一个元素x,使p(x)成 立即可,否则这一存在性命题就是假命题.
核心素养之数学抽象
HEXINSUYANGZHISHUXUECHOUXIANG
全称命题与存在性命题的应用
典例 f(x)=x2-2x,g(x)=ax+2(a>0),∀x1∈[-1,2],∃x∈[-1,2],使 f(x1)=g(x),则a的取值范围是
A.0,12
B.12,3
(4)存在一个实数x,使得等式x2+x+8=0成立; 解 假命题,方程x2+x+8=0的判别式Δ=-31<0,故方程无实数解. (5)∀x∈R,x2-3x+2=0; 解 假命题,只有当x=2或x=1时,等式x2-3x+2=0才成立. (6)∃x∈R,x2-3x+2=0. 解 真命题,x=2或x=1,都能使等式x2-3x+2=0成立.
解 关于x的不等式x2+(2a+1)x+a2+2≤0的解集非空, ∴Δ=(2a+1)2-4(a2+2)≥0,即4a-7≥0, 解得 a≥74, ∴实数 a 的取值范围为74,+∞.
(2)若命题 p: 1-sin 2x=sin x-cos x 是真命题,求实数 x 的取值范围.
解 由 1-sin 2x=sin x-cos x,
反思感悟 要判断全称命题“∀x∈M,p(x)”是真命题,需要对集合M中每 个元素x,证明p(x)都成立;如果在集合M中找到一个元素x,使得p(x)不成立, 那么这个全称命题就是假命题. 要判断存在性命题“∃x∈M,p(x)”是真命题,只需在集合M中找到一个元 素x,使p(x)成立即可;如果在集合M中,使p(x)成立的元素x不存在,那么这 个存在性命题就是假命题.
B2U1-A

新视野 主 题 导 入
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[For reference] More proverbs include:
5) Time heals all wounds. 时间能够治疗一切创伤。 6) Time tries truth. 时间检验真理。 7) Time works wonders. 时间可以创造奇迹。 8) Never put off till tomorrow what may be done today. 今日事,今日毕。 9) One today is worth two tomorrows. 一个今天
短语应用 句型应用
Creative Application of Compatible Expressions
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写作
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1. 落后;跟不上
to fall behind under pressure to race through
to have little or no relation to to give added weight to
等于两个明天。
10) Time is like the water sucked in sponge: if you squeeze, you can always get some. 时间像海
绵里的水,只要去挤总会有的。
Exercises:Task 4 Directions: Choose the ONE answer that best completes each sentence. ( ) 1. He got thoroughly wet and ______ he caught a bad cold. A. in consequence B. in nature C. in general D. in sequence ( ) 2. Our former English teacher retired, and Mrs. Wang ___ him. A. in place B. in place of C. replaced D. replaced by
北师大版数学选修2-1巩固提升:第一章 4.3 逻辑联结词“非”

[A 基础达标]1.已知p :x ∈A ∩B ,则¬p 是( )A .x ∈A 且x ∉BB .x ∉A 或x ∉BC .x ∉A 且x ∉BD .x ∈A ∪B解析:选B.x ∈A ∩B ,即x ∈A 且x ∈B ,故¬p 是x ∉A 或x ∉B .2.若命题“p 且q ”为假,且非p 为假,则( )A .“p 或q ”为假B .q 为假C .p 为假D .q 为真解析:选B.因为非p 为假,所以p 为真,又“p 且q ”为假,所以q 必为假,故选B.3.设命题p :方程x 2+3x -1=0的两根符号不同;命题q :方程x 2+3x -1=0的两根之和为3,判断命题“非p ”“非q ”“p 且q ”“p 或q ”为假命题的个数为( )A .0B .1C .2D .3解析:选C.由于Δ>0,且两根⎩⎪⎨⎪⎧x 1x 2=-1,x 1+x 2=-3,p 为真命题,q 为假,所以非p 为假命题,非q 为真命题;p 且q 为假命题,p 或q 为真命题,故选C.4.给定两个命题p ,q ,若¬p 是q 的必要不充分条件,则p 是¬q 的( )A .充分不必要条件B .必要不充分条件C .充要条件D .既不充分也不必要条件解析:选A.因为¬p 是q 的必要不充分条件,所以q ⇒¬p 但¬p ⇒/q ,所以p ⇒¬q 但¬q ⇒/p ,故p 是¬q 的充分不必要条件.5.命题p :“若a <b ,则2a <2b ”的否命题及命题p 的否定为( )A .否命题:若a ≥b ,则2a ≥2b ,否定:若a <b ,则2a ≥2bB .否命题:若a <b ,则2a ≥2b ,否定:若a ≥b ,则2a ≥2bC .否命题:若2a <2b ,则a <b ,否定:若2a <2b ,则a ≥bD .否命题:若a >b ,则2a >2b ,否定:若a <b ,则2a >2b解析:选A.否命题是对原命题的条件和结论均否定;写否命题时大前提不变.故选A.6.命题p :x =5且y =7,则¬p 为________.解析:¬p :x ≠5或y ≠7.答案:x ≠5或y ≠77.已知命题p :{2}∈{1,2,3},q :{2}⊆{1,2,3},则下列结论:①p 或q 为真;②p 或q 为假;③p 且q 为真;④p 且q 为假;⑤非p 为真;⑥非q 为假.其中所有正确结论的序号是________.解析:因为p :{2}∈{1,2,3},q :{2}⊆{1,2,3},所以p 假q 真,故①④⑤⑥正确. 答案:①④⑤⑥8.已知p :x 2-x ≥6,q :x ∈Z .若“p 且q ”“ ¬q ”都是假命题,则x 的值组成的集合为________.解析:因为“p 且q ”为假,“¬q ”为假,所以q 为真,p 为假.故⎩⎪⎨⎪⎧x 2-x <6,x ∈Z ,即⎩⎪⎨⎪⎧-2<x <3,x ∈Z . 因此,x 的值可以是-1,0,1,2.答案:{-1,0,1,2}9.写出下列各组命题构成的“p 或q ”“p 且q ”以及“非p ”形式的命题,并判断它们的真假.(1)p :5是有理数,q :5是整数;(2)p :不等式x 2-2x -3>0的解集是(-∞,-1),q :不等式x 2-2x -3>0的解集是(3,+∞).解:(1)p 或q :5是有理数或5是整数;p 且q :5是有理数且5是整数;非p :5不是有理数.因为p 假,q 假,所以“p 或q ”为假,“p 且q ”为假,非p 为真.(2)p 或q :不等式x 2-2x -3>0的解集是(-∞,-1)或不等式x 2-2x -3>0的解集是(3,+∞);p 且q :不等式x 2-2x -3>0的解集是(-∞,-1)且不等式x 2-2x -3>0的解集是(3,+∞);非p :不等式x 2-2x -3>0的解集不是(-∞,-1).因为p 假,q 假,所以p 或q 假,p 且q 假,非p 为真.10.已知命题p :|m +1|≤2成立;命题q :方程x 2-2mx +1=0有实数根.若¬p 为假命题,p 且q 为假命题,求实数m 的取值范围.解:|m +1|≤2⇒-2≤m +1≤2⇒-3≤m ≤1,即命题p :-3≤m ≤1.方程x 2-2mx +1=0有实数根⇒Δ=(-2m )2-4≥0⇒m ≥1或m ≤-1,即q :m ≥1或m ≤-1.因为¬p 为假命题,“p 且q ”为假命题,则p 为真命题,所以q 为假命题,¬q 为真命题,¬q :-1<m <1.由⎩⎪⎨⎪⎧-3≤m ≤1-1<m <1⇒-1<m <1, 即m 的取值范围是(-1,1).[B 能力提升]11.在一次跳伞训练中,甲、乙两位学员各跳一次,设命题p 是“甲降落在指定范围”,q 是“乙降落在指定范围”,则命题“至少有一位学员没有降落在指定范围”可表示为( )A .(¬p )或(¬q )B .p 或(¬q )C .(¬p )且(¬q )D .p 或q解析:选A. ¬p 是“甲没降落在指定范围”; ¬q 是“乙没降落在指定范围”. 命题“至少有一位学员没降落在指定范围”包括:“甲降落在指定范围,乙没降落在指定范围”或“甲没降落在指定范围,乙降落在指定范围”或“甲没降落在指定范围,乙没降落在指定范围”,故该命题可表示为(¬p )或(¬q ).12.已知p :x >1或x <-15,q :1x 2+4x -5>0,则非p 是非q 的________条件. 解析:由1x 2+4x -5>0得,x 2+4x -5>0,所以x <-5或x >1, 由于⎩⎨⎧⎭⎬⎫x |x >1或x <-15{x |x >1或x <-5}, 所以p 是q 的必要不充分条件,即p ⇒⇐/q ,所以非q ⇒⇐/非p ,即非p 是非q 的充分不必要条件. 答案:充分不必要13.已知p :|4-x |≤6,q :x 2-2x +1-a 2≥0(a >0),若非p 是q 的充分不必要条件,求实数a 的取值范围.解:¬p 即|4-x |>6,解得x >10或x <-2,记A ={x |x >10或x <-2},q :x 2-2x +1-a 2≥0,解得x ≥1+a 或x ≤1-a ,记B ={x |x ≥1+a 或x ≤1-a },¬p ⇒q ,即A 是B 的真子集,所以⎩⎪⎨⎪⎧1-a ≥-2,1+a ≤10,1+a >1-a ,解得0<a ≤3,即实数a 的取值范围是(0,3].14.(选做题)已知命题p :对任意x ∈R ,ax 2+2x +1≠0,q :存在x ∈R ,ax 2+ax +1≤0.若(¬p )且(¬q )为真命题,求实数a 的取值范围.解:因为(¬p )且(¬q )为真命题,所以¬p 与¬q 都是真命题,从而p 与q 都是假命题.所以“关于x 的方程ax 2+2x +1=0有解”与“ax 2+ax +1>0对一切x ∈R 恒成立”都是真命题.由关于x 的方程ax 2+2x +1=0有解,得a =0,或⎩⎪⎨⎪⎧a ≠0,4-4a ≥0,即a =0,或a ≤1且a ≠0, 所以a ≤1.由ax 2+ax +1>0对一切x ∈R 恒成立,得a =0,或⎩⎪⎨⎪⎧a >0,a 2-4a <0,即a =0,或0<a <4, 所以0≤a <4.由⎩⎪⎨⎪⎧a ≤1,0≤a <4得0≤a ≤1,故实数a 的取值范围是[0,1].由Ruize收集整理。
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10.
is known to all that the Amber Room belongs to the Russians.
A. As
B. which
C. It
D. What
11. This book will
to the students of English.
A. be of great value
C. of
D. in
14. Neither of them thought highly of him and they both tried to him in his work.
A. hamper
B. support
C. assist
D. encourage
15. A clean envir onment can help the city bid for the Olympics, which
7. Two leaders 8.It is
(secret) flew to that country to solve the problem. (doubt) whether he can carry on his tasks as president for the next five
years.
B. well thought of D. good thought
17. Mr. Zhang A. selected 18. Mike
to be Chairman of the meeting.
B. has selected C. was selected
D. selects
his car, for he came to work by bus this morning.
a bed.
A. serve as
B. serving as C. be served as D. served as
24. Our friends have done a lot for us, but we have done little
.
A. back
B. in return
C. pay back
D. return
25. They went in different directions
water in the desert.
A. to search
B. in search of C. search of
D. searching
26. The weather turned out to be fine yesterday. I
学海无涯
巩固练习
一、用括号中所给词的适当形式填空。
1. I won’t waste any more of your 2.It’s normal to experience
(value) time. (culture) shock when you go abroad for the first
time.
the trouble to carry my umbrella with
me.
A. should have taken
B. could have taken
学海无涯
C. needn’t have taken 27. I have no doubt
D. mustn’t have taken Lily will go to see Jay Chou’s live show, because she loves him
that he finished the work in less than an hour.
9. 老板不看重他。
He was not
10. 我送给他一份礼物以回报他对我的帮助。
I sent him a present
11. 他言行不一致。
His words
.
12. 他们对你的工作能力评价很高。
They
—There are so many troublesome problems
.
A. remaining to settle
B. remained settled
C. remaining to be settled
D. remained to be settled.
30. It is not to discuss the question again and again.
3. He is the only
(survive) of the accident.
4. That shop has a fine
(select) of cakes.
5. Our
(wood) sofa seems not very comfortable.
6. It was
(amaze) that he knew nothing about the event.
B. surprise
C. wonder
D. matter
4. I’m sorry to have you
so long.
A. waited
B. to wait
C. waiting
D. to be waiting
5. Let me try to
my ideas to you in another way.
A. can have found
B. could have found
C. c an’t havefound
D. mustn’t have found
19. As is known to all, the financial crisis firstly broke out in the United States, which
4.
那
本词典是图书馆的。(belong to)
That dictionary
.
5.
我认
为这部电影值得再看一次。(worth) I
think
.
6. 我也不知道他们能不能准时到。(wonder)
学海无涯
I wonder
.
7. 这个想法很值得考虑(consider)
The idea
8. 我惊奇的是,他在不到一个小时的时间里就完成了工作。(amaze)
B. be of great valuable
C. be great value
D. be of very value
12. — The English exam is not difficult, is it?
— . Even Tom
to the top students failed in it.
sent him to a city school after that.
A. experienced
B. escaped C. survived
D. suffered
21. Teenagm school although they don’t do well in studies.
your work abilities.
四、单项选择:
1. The police
him to see if he had a gun.
A. searched for B. searched
C. in search of
2. —We don’t know who stole the book. What’s you opinion?
A. worth
B. worthy
C. worthwhile
D. worth while
答案与解析
一、用括号中所给词的适当形式填空。
1. valuable
2. cultural
3. survivor
4. selection
5. wooden
A. recreate
B. restore
C. represent
D. rebuild
6. It usually takes the runners a few minutes to
their breath after a long race.
A. hold
B. lose
C. keep
D. get
7. The matter is
9. The
(sail) are asked to take their positions by their captain.
10. Yesterday they were invited to a
(form) party.
二、将下列词组或短语译成中文或英文。 1. in search of 2. belong to 3. at war 4. in return 5. less than 6. take part in 7. think highly of 8. pay much attention to 9. rather than 10.there is no doubt that 11.文化遗产 12. 调查 13. 充当;作……之用 14. 在某一点上达成协议 15. 认为……是……;把……看作……
C. of to prove
D. of being proved.
9. I have been living in the United States for twenty years, but seldom
A. have I felt
B. I had felt
C. I have felt
so lonely as now. D. had I felt
consideration and the result will come out tomorrow.