01-01荔湾-广州市荔湾区2018-2019学年第一学期期末教学质量检测
广东省广州市荔湾区2018-2019学年八年级第一学期数学期末考试卷
2018-2019学年荔湾区八年级第一学期期末教学质量检测试卷（数学试卷）一、选择题（本大题共10小题，每小题2分，共20分，在每小题给出的四个选择项中，只有一项是符合题目要求的）1. 若代数式1在实数范围内有意义，则实数a的取值范围为（）a−4A. a=4B. a>4C. a<4D.a≠42. 下列计算正确的是（）A. a2+a3=a5B.(2a)2=4aC.a2∙a3=a5D. (a2)3=a53. 计算(a−2)(a+3)的结果是（）A. a2−6B. a2+a−6C.a2+6D.a2−a+64. 下面四个图形分别是绿色食品、节能、节水、低碳标志，在这四个标志中，是轴对称图形的是（）A. B. C. D.5. 如图，在RtΔABC中，∠C=90°,∠ABC的平分线BD 交AC 于点D，若CD=3，则点D 到AB 的距离是（）A. 5B. 4C. 3D. 26. 一个多边形的内角和是720°，这个多边形的边数是（）A. 6B.7C. 8D.97. 若等腰三角形的两边长分别是3、5，则第三边长是（）A.3或5B. 5C. 3D.4或68. 如图，∠ACD是ΔABC的外角，CE 平分∠ACD，若∠A=60°，∠B=40°，则∠ECD 等于（）A.40°B.45°C.50°D.55°9. 如图，五边形ABCDE 中有一正三角形ACD，若AB=DE，BC=AE，∠E=115°，则∠BAE的度数是（）A.115°B.120°C.125°D.130°10. 如图，在ΔABC中，AB=AC，AD、CE是ΔABC的两条中线，点P 是AD 上一个动点，则BP+EP 的最小值等于线段（）的长度.A.BCB.CEC. ADD. AC二、填空题（本大题共6小题，每小题3分，共18分）11. 计算：2x2+x=___________.12. 计算：x 2x+1−1x+1=___________.13. 如图，∆AEB≅∆DFC,AE⊥CB,DF⊥BC,AE=DF,∠C=28°,则∠A=___________.14. 等腰三角形的一个内角是100°，则顶角的度数是_________.15. 已知a m=3,a n=2,则a2m−n=_____________.16. 如图，ΔABC中，AB=AC，AD⊥BC 于D 点，DE⊥AB 于点E，BF⊥AC 于点F，DE=3cm，则BF=_______cm.三、解答题（本大题共7题，共62分，解答应写出文字说明、证明过程或演算步骤.）17.（共8分）计算：（1）(a2b)2∙b2a（2）(2x−1)2−x(2−x)18.（共8分）分解因式：（1）m n2−2mn+m（2）x2−2x+(x−2) 19.（共8分）计算：（1）x−2x+2∙x2+4x+4x−4（2）(1a−1+1a+1)÷4+2aa−120.（共8分）如图，在ΔABC中，AD是中线，CE⊥AD 于点E，BF⊥AD，交AD 的延长线于点F，求证：BF=CE.21.（共10分）如图，在正方形网格中，每一个小正方形的边长为1.格点三角形ABC（顶点是网格线交点的三角形）的顶点A、C 的坐标分别是（-4，6），（-1，4）.（1）请在图中的网格平面内建立平面直角坐标系（直接在图中画出）；（2）请画出ΔABC关于x轴对称的ΔA1B1C1；（3）写出点A1、C1的坐标.。
2018-2019学年广东省广州市荔湾区高二上学期期末教学质量监测文科数学试题
2018-2019学年广东省广州市荔湾区高二上学期期末教学质量监测文科数学试题★祝考试顺利★注意事项：1、答题前，请先将自己的姓名、准考证号用0.5毫米黑色签字笔填写在试题卷和答题卡上的相应位置，并将准考证号条形码粘贴在答题卡上的指定位置。
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一、选择题：本题共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.双曲线的渐近线方程为A. B. C. D.【答案】B【解析】【分析】双曲线的的渐近线方程.【详解】a=4,b=3,所以渐近线方程，故选B.【点睛】考查双曲线的基本性质，渐近线的求法.属于基础题。
2.命题“如果，那么”的逆否命题是A. 如果，那么B. 如果，那么C. 如果，那么D. 如果，那么【答案】D【解析】【分析】根据命题的逆否命题的概念，即是逆命题的否命题，也是原命题的逆否命题；写出逆命题，再求其否命题即可．【详解】因为原命题的逆命题是：如果，那么，其否命题为：如果，那么，所以原命题的逆否命题是：如果，那么，故选C．【点睛】本题主要考查四种命题间的关系．解答与四个命题有关的问题时，要注意四种命题关系的相对性，一旦一个命题定为原命题，也就相应地确定了它的“逆命题”“否命题”“逆否命题”，注意利用“原命题”与“逆否命题”同真假.3.根据给出的程序框图（如图），计算A. 0B. 1C. 2D. 4【答案】A【解析】试题分析：输入，满足，所以；输入，不满足，所以，即.故选.考点：算法与程序框图，函数的概念.4.某学校共有教师120人，老教师、中年教师、青年教师的比例为，其中青年男教师24人. 现用分层抽样的方式从该校教师中选出一个30人的样本，则被选出的青年女教师的人数为A. 12B. 6C. 4D. 3【答案】D【解析】【分析】求出该校青年教师的人数，再根据男青年教师求出其所占比例，所以样本中青年教师所占比例以及男女青年教师所占比例都可得到。
广东省广州市荔湾区2018-2019学年高一上学期期末考试数学试题 含解析
广东省广州市荔湾区2018-2019学年高一上学期期末数学试题一、选择题（本大题共12小题，共60.0分）1.的值是A. B. C. D.【答案】B【解析】【分析】利用诱导公式把要求的式子化为，即，从而得到答案．【详解】，故选：B．【点睛】本题主要考查利用诱导公式化简求值，熟记诱导公式，准确计算是关键，属于基础题．2.三个数，，的大小顺序是A. B.C. D.【答案】A【解析】【分析】由指数函数和对数函数单调性得出范围，从而得出结果．【详解】，，；．故选：A．【点睛】本题考查指数函数和对数函数的单调性，熟记函数性质是解题的关键，是基础题.3.设集合2，，若，则A. B. C. D.【答案】D【解析】【分析】由交集的定义可得1∈A且1∈B，代入二次方程，求得m，再解二次方程可得集合B．【详解】解：集合A={1，2，4}，B={x|x2-4x+m=0}．若A∩B={1}，则1∈A且1∈B，可得1-4+m=0，解得m=3，即有B={x|x2-4x+3=0}={1，3}．故选：D．【点睛】本题考查了交集及其运算，考查了一元二次不等式的解法，是基础题．Array4.在中，，则的值为A. B. C. D. 2【答案】C【解析】【分析】直接利用三角函数关系式的恒等变换和特殊角的三角函数的值求出结果．【详解】在中，，则，，，,故选：C．【点睛】本题考查的知识要点：三角函数关系式的恒等变换和特殊角三角函数的值的应用，主要考查学生的运算能力和转化能力，属于基础题型．5.汽车经过启动、加速行驶、匀速行驶、减速行驶之后停车，若把这一过程中汽车的行驶路程看作时间的函数，其图象可能是( )【答案】A 【解析】试题分析：汽车启动加速过程，随时间增加路程增加的越来越快，汉使图像是凹形，然后匀速运动，路程是均匀增加即函数图像是直线，最后减速并停止，其路程仍在增加，只是增加的越来越慢即函数图像是凸形．故选A ．考点：函数图像的特征． 6.函数的图象沿x 轴向左平移个单位后，得到一个偶函数的图象，则的一个可能的值为A.B.C. 0D.【答案】B 【解析】 【分析】 利用函数的图象变换可得新函数解析式，利用其为偶函数即可求得答案．【详解】令，则，为偶函数，，，，当时，．故的一个可能的值为． 故选：B ．【点睛】本题考查函数的图象变换，考查三角函数的奇偶性，熟记变换原则，准确计算是关键，属于中档题．7.已知，，，的夹角为，如图所示，若，，且D为BC中点，则的长度为A. B. C. 7 D. 8【答案】A【解析】【分析】AD为的中线，从而有，代入，根据长度进行数量积的运算便可得出的长度．【详解】根据条件：；．故选：A．【点睛】本题考查模长公式，向量加法、减法及数乘运算，向量数量积的运算及计算公式，根据公式计算是关键，是基础题.8.已知函数f(x)=若f（f（0））=4a，则实数a等于【】A. B. C. 2 D. 9【答案】C【解析】，选C.点睛：(1)求分段函数的函数值，要先确定要求值的自变量属于哪一段区间，然后代入该段的解析式求值，当出现的形式时，应从内到外依次求值.(2)求某条件下自变量的值，先假设所求的值在分段函数定义区间的各段上，然后求出相应自变量的值，切记代入检验，看所求的自变量的值是否满足相应段自变量的取值范围.9.若函数分别是上的奇函数、偶函数，且满足，则有（）A. B.C. D.【答案】D【解析】试题分析：函数分别是上的奇函数、偶函数，由得，解方程组得，代入计算比较大小可得考点：函数奇偶性及函数求解析式10.函数在单调递减，且为奇函数，若，则满足的的取值范围是（）．A. B. C. D.【答案】D【解析】是奇函数，故；又是增函数，，即则有，解得，故选D.【点睛】解本题的关键是利用转化化归思想，结合奇函数的性质将问题转化为，再利用单调性继续转化为，从而求得正解.11.已知函数，则的零点所在区间为A. B. C. D.【答案】B【解析】根据函数的零点判定定理可求．【详解】连续函数在上单调递增，，，的零点所在的区间为，故选：B．【点睛】本题主要考查了函数零点存在定理的应用，熟记定理是关键，属于基础试题．12.函数在区间上的最大值为2，则实数a的值为A. 1或B.C.D. 1或【答案】A【解析】试题分析：因为，令，故，当时，在单调递减所以，此时，符合要求；当时，在单调递增，在单调递减故，解得舍去当时，在单调递增所以，解得，符合要求；综上可知或，故选A.考点：1.同角三角函数的基本关系式；2.二次函数的最值问题；3.分类讨论的思想.二、填空题（本大题共4小题，共20.0分）13.计算______．【答案】11【分析】进行分数指数幂和对数式的运算即可．【详解】原式．故答案为：11．【点睛】本题考查对数式和分数指数幂的运算，熟记运算性质，准确计算是关键，是基础题.14.设，，，则______．【答案】【解析】【分析】利用向量的坐标运算先求出的坐标，再利用向量的数量积公式求出的值．【详解】因为，，，所以，所以，故答案为：【点睛】本题考查向量的坐标运算，考查向量的数量积公式，熟记坐标运算法则，准确计算是关键，属于基础题．15.函数的一段图象如图所示则的解析式为______．【答案】【解析】【分析】由函数的最值求出A，由周期求出，由五点法作图求出的值，从而得到函数的解析式．【详解】由函数的图象的顶点的纵坐标可得，再由函数的周期性可得，．再由五点法作图可得，．故函数的解析式为，故答案为．【点睛】本题主要考查函数的部分图象求解析式，由函数的最值求出A，由周期求出，由五点法作图求出的值，属于中档题．16.已知f（x）是定义在R上的偶函数，且在区间（−，0）上单调递增.若实数a满足f（2|a-1|）＞f（），则a的取值范围是______.【答案】【解析】试题分析：由题意在上单调递减，又是偶函数，则不等式可化为，则，，解得．【考点】利用函数性质解不等式【名师点睛】利用数形结合解决不等式问题时，在解题时既要想形又要以形助数，常见的“以形助数”的方法有：（1）借助数轴，运用数轴的有关概念，解决与绝对值有关的问题，解决数集的交、并、补运算非常有效．（2）借助函数图象的性质，利用函数图象分析问题和解决问题是数形结合的基本方法，需要注意的问题是准确把握代数式的几何意义实现由“数”向“形”的转化．三、解答题（本大题共6小题，共70.0分）17.已知函数，．1求的值；2若，，求【答案】(Ⅰ)=1；(Ⅱ)=【解析】试题分析：（1）将代入可得：，在利用诱导公式和特殊角的三角函数值即可；（2）因为，根据两角和的余弦公式需求出和，，，则，根据二倍角公式求出代入即可．试题解析：（1）因为，所以；（2）因为，，则。
六年级上册数学试题 - 【荔湾区】2018-2019学年第一学期期末测试 通用版(含解析)
0.8；8%=0.08
，要使比值不变，后项应（(B)乘4
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15
一个圆的直径是6厘米，它的周长是（
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（吨）
:0.125化成最简单的整数比是（），比值是（
7:1；7
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学期末，同学们要推选一名学习标兵。
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10911109 ;30%; 3030303030，王伟得票最多；1111
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（票）
在一个圆形的亭子里，小丽沿着直径从一端走步到达另一端，每步长约是。
小丽绕着这个亭子走一圈，大约要（（结果保留整数）
3.141237.6838（步）
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根据下面的描述，在右边平面图上标出各个场所的位置。
（4分）
1500米处。
【答案】
上衣和裤子的价格分别是多少？元 这套运动服共720元 裤子的价格是上衣的 4
5
的位置就餐，这张桌子大约能坐多少人？。
广东省广州市荔湾区2018-2019年九年级第一学期期末英语试卷(word版 含答案)
2018学年第一学期期末教学质量检测九年级英语2019年1月一、语法选择When I was in second grade, my friend Resi and I walked to school together every morning. We should ___1___ to a certain corner because it would be much ___2___ for us.Most mornings we did as we ___3___ by our parents, but sometimes we took shortcuts (捷径). One day, on one of those roads, we saw a young man, a stranger, in front of ___4___ house. He was cutting wood. We stopped and wondered ___5___ he was. The young man looked up from his woodpile ___6___ “Hi” to us with a smile. Was he talking to us? We wondered. What did he say? We had no idea: we didn’t know ___7___ English. So we ran away.Every morning, when we ___8___ by, the young man waved and repeated his “Hi”“Bye-bye”. Resi and I waved back and said “Hi”“Bye-bye”___9___ return. We became quite comfortable with this morning routine. Sometimes he would be singing, ___10___ we would stand, listening to the strange language. “You are my sunshine...” he sang over and over, slowly, ___11___ we could repeat it.We learned one line after another, and soon we could sing the whole song, not knowing the meaning and not caring. One day, the young man suddenly disappeared. He left Resi and ___12___ a wonderful gift: our first English lesson and many happy memories.Years later, at a picnic, someone started ___13___, “You are my sunshine...”. Of course I remembered the words, and I ___14___ joined in. And to this day, I remember him whenever I hear the song ___15___ he taught us.1.A. walk B. walked C. walking D. walks2.A. safe B. safety C. safer D. safest3.A. told B. were told C. were telling D. tell4.A. a B. the C. an D. /5.A. that B. which C. who D. why6.A. say B. says C. said D. to say7.A. some B. any C. every D. all8.A. pass B. have passed C. were passing D. were passed9.A. for B. to C. on D. in10.A. but B. if C. or D. and11.A. until B. if C. yet D. after12.A. I B. me C. myself D. mine13.A. sing B. sang C. sung D. singing14.A. happy B. happily C. happiness D. happier15.A. what B. who C. which D. when二、完型填空I first began experiencing anxiety (焦虑) at the age of 14, after being hurt at school for years. While at first anxiety would come and go, it ___16___ became a part of my life.I was so ___17___ that I hoped to find a way to get rid of my anxiety. I tried everything I read about in books, and advice given by doctors. But it didn’t quite work.But one afternoon, I saw a good ___18___ in a magazine, talking about how dogs were able to help people with anxiety. The next day, I decided to get a dog. When I brought my little dog, Buddy, home, I didn’t ___19___ how much he could change my life. It didn’t happen right away, however.Once the “puppy excitement” went away, my anxiety came back ___20___. One morning, I woke up with those ___21___ feelings again. I didn’t want to get out of bad. Suddenly, Buddy started to ___22___ all over me, letting me know that it was time to go outside. And for the first time in my life, on a day when my anxiety was strong, I got out of bed. I put on my winter clothes and went for a ___23___ in the snow with my new friend. I realized at that moment, walking down the street in winter, my life was changing. I really was a new ___24___. This was my new beginning.It’s been more than a year since that day, and I’ve never spent another morning unable to get out of bed. Sure, I still have days when I feel anxious. But with Buddy by my side, I’ve learned how to ___25___ these feelings and emotions.16.A. finally B. usually C. hopefully D. clearly17.A. honest B. pleased C. brave D. worried18.A. email B. article C. album D. notice19.A. care B. realize C. understand D. explain20.A. as usual B. all the time C. in this way D. for a second21.A. strange B. pleasant C. strong D. secret22.A. wash B. attack C. blow D. jump23.A. rest B. shower C. walk D. holiday24.A. person B. friend C. customer D. dog-keeper25.A. share B. control C. protect D. finish三、阅读第一节阅读理解AJane was sitting in the kitchen going over the party list with her mother. The exams were over, and Jane wanted to invite her friends for a party.“Jane, aren’t you going to invite Helen?” her mother asked. Helen had been her best friend since childhood.“Mother, you know I am now a part of Purple Girls Club and we have some rules about people we can be friends with,” Jane answered.“Really? And what are the rules?” her mother asked.“Well, only very pretty girl can be part of our group. And Helen is so ... dark.”“I can’t believe it,” her mother said angrily.As Jane left the kitchen, her father called her from the living room.Jane went to her father and her face paled when she saw the exam report in his hands. “Jane, what has happened to your grades? You have failed in math,” her father shouted.Jane had no answer. The truth was that the activities of Purple Girls Club left her with very little time for studies.“Jane, it says that you can take part in supplementary exams (补考). If your grades don’t improve then, I’ll have to say no to your trip to Spain.”Jane went to her room and called her friends in the club one by one. But no one seemed to care or wanted to help.Jane knew Helen would help her. Jane also knew Helen had been hurt by her, but Helen said, “If you need any help, just let me know. We can study together till your exams.”Next Monday, as two friends entered the school together, Gina called out.“Jane, you know our rules. You can’t be friends with those who do not belong to our club.”“Gina, I have a new rule about friendship,” Jane replied.26.After Jane became a member of Purple Girls Club, she chose a friend according to his/her ___________.A.appearanceB. hobbiesC. gradesD. family27.Jane turned pale after going to her father because _____________.A.she didn’t do well in the examsB.she had to leave Purple Girls ClubC.he asked her to improve her gradesD.he didn’t allow her to hold the party28.If Jane failed her exam again, she would not be able to __________.A.go to SpainB. hold a partyC. join the Purple Girls ClubD. make friends with Helen29.What did Jane mean by saying “I have a new rule about friendship” in the last paragraph?A.She will make a new rule for Purple Girls Club.B.She will have to end the friendship with Gina.C.She will invite Helen to join Purple Girls Club.D.She will go on being good friends with Helen.30.What is the best title of this passage?A.Be Slow in Choosing a FriendB.A Friend in Need is a Friend IndeedC.Friendship Can Be Developed EasilyD.A Perfect Friend Will Never Be FoundBA young girl named Malala, born in 1997 in the northwest of Pakistan, is famous for supporting children and women’s education.In 2012, she was shot and seriously injured when she returned home on the school bus. Luckily, she was sent to the hospital in time and saved. After that, she went back to school and began to fight for children and women to receive education.On October 10, 2014, the Nobel Peace Prize was awarded to Malala. She became the youngest winner in the history of Nobel Prize. However, Malala missed the most important event of being announced to be the winner of the prize. At that moment, she was taking chemistry lessons in the classroom! After hearing the news, Malala chose to take her history and physics lessons as usual. She said calmly to the reporter, “I’m proud of getting this prize. Although the unforgettable date itself means something to me, it’s more important to finish the rest lessons today. After all, it’s a normal school day.”One year later, Amy Mainzer, an astronomical scientist of NASA, found a new planet. She named it “Malala”. When Amy Mainzer was interviewed by Times, she explained, “I think Malala has set an example for us. She is fearless and insists on helping children and women get the right of being educated. Nothing can stop her.”Last year, Malala passed the entrance examination of Oxford University through her hard work. Before she finished her high school, she had written a book I am Malala in 2013. She said, “I hope the readers around the world have chances to read my book. My dream is that more and more people will realize it is very difficult for children and women in some areas to get education. Actually, my story is also the story of 61 million children.Every boy and every girl should have the right to go to school.”31.Malala was sent to hospital because ______________.A.she got a serious diseaseB.she was attacked with a gunC.she was hurt in a traffic accidentD.she fought with others and was hurt32.How old was Malala when she won the Nobel Peace Prize?A.15.B. 16.C. 17.D. 18.33.Why did Malala miss the event of being announced to be the winner of Nobel Prize?A.She was seriously injured and she had no choice but to stay in hospital.B.She was afraid to go because the place was too far away from Pakistan.C.She thought it more important to get education than to attend the award event.D.The lessons were so important that her school didn’t allow her to miss them.34.What is the correct order of the following events according to the passage?a.The Nobel Prize was awarded to Malala.b.Malala wrote a book called I am Malala.c.A planet was named after Malala for her great work.d.Malala became a student of Oxford University in the UK.e.Malala began to be interested in the education for children and women.A.e-a-c-d-bB. e-b-a-c-dC. b-a-c-e-dD. b-a-d-c-e35.Which of the following about Malala is NOT true according to the passage?A.She fights for helping children and women to go to school.B.She is the youngest winner in the history of Nobel Prize.C.She was taking chemistry lessons when she was awarded.D.She wrote a book about readers from all over the world.CEvery year on 15th October, over 200 million people around the world take part in Global Handwashing Day. But why do we have a day for something we do all the time? Well, research shows that not enough people often wash their hands with soap. It is believed that this leads to the deaths of millions of people every year.What’s more, the study from the US Department of Agriculture shows most people failed to wash their hands and rub (擦) with soap for 20 seconds. That’s the amount of time recommended by the Centers for Disease Control and Prevention, which says that washing for shorter periods means fewer germs (细菌) are washed off.The study also states that quite many people didn’t dry their hands with a clean towel or air dryer.Sidibe, a public health officer says soap is the most beautiful invention in public health. Washing your hands with soap can have a huge impact on reducing the spread of diseases. It can also prevent babies from getting ill and keep children healthy.However, washing hands with soap does not happen as often as you might think. For manypeople, handwashing is simply not part of their everyday life. It’s not easy to get people to change habits they learned in early childhood.So what’s the right way to wash hands? There are some tips:Step 1: Wet hands with clean, running water.Step 2: Turn off the tap and apply soap after wetting hands with water.Step 3: Rub hands together with the soap for at least 20 seconds. Be sure to rub the backs of hands, between fingers, and under fingernails.Step 4: Wash hands well under clean, running water.Step 5: Dry hands with a clean towel or air dryer.In 2008 the Indian sports team joined around 100 million Indian schoolchildren in washing their hands with soap on the first ever Global Handwashing Day. Since then, many different events have been held around the world every year.Today, local and national leaders continue to use the day to spread the message about the importance of clean hands. The hope is that handwashing with soap becomes a necessary part of people’s lives and improves the health of millions around the world.36.Why do we have Global Handwashing Day?A.Because some people do not wash hands with clean water.B.Because soap is the most impportant invention in the world.C.Because there is not enough soap in the poorer countries.D.Because washing hands with soap can stop some diseases.37.The underlined word “impact” in Paragraph 4 means ___________.A.effectB. prizeC. surveyD. sense38.Which of the following statements is true according to the report?A.You should use soap directly when your hands are dry.B.The longer hands are washed, the fewer germs are washed off.C.Many people don’t wash their hands with soap and rub for 20 seconds.D.Dirty hands make people feel uncomfortable but won’t cause the death.39.Who started Global Handwashing Day?A.Public health officers.B. African schoolchildren.C. The Indians.D. Government leaders.40.What’s the main idea of the last paragraph?A.Local leaders will teach people how to wash hands.B.People are encouraged to wash hands with soap.C.Different events are held to fight against diseases.D.Washing hands with soap is good for public health.DJackie is writing a summary and feedback (反馈) about School Day to his teacher. Summary:School Day was held successfully on Dec 6th. Twenty-four students helpers from Grade 9 were divided into four groups of six. Each group had a task to raise money for the disabled.Group 1 Group 2 Group 3 Group 4School postcards (Leader: Natalie) Chinese paintings(Leader: Tina)Recycling bagsmade by students(Leader: Leo)Homemade snacksby parents(Leader: Nick)All of groups performed well on School Day and received praise from the visitors. In short, our School Day went well and we got no poor opinions from the visitors.Opinions from 300 students have been collected. Most students thought the activities were good. However, some students thought the prices of the school postcards were a little bit high.Follow-up:Have a meeting with the headmaster about prizes for excellent student helpers.41.The text is written to ____________.A.give a reportB. have School DayC. collect opinions from visitorsD. hold a meeting with teachers42.Visitors cannot buy ____________ on the School Day.A.Chinese paintingsB. School postersC. Recycling bagsD. Homemade snacks43.How did the visitors feel about the activities?A.Disappointed.B. Satisfied.C. Excited.D. Surprised.44.How many students like the recycling bags according to the feedback?A.50.B. 75.C. 150.D. 300.45.Which of the following is true about the activities?A.The postcards were cheap.B.Nick was the leader of Group 1.C.Twenty-four students offered their feedback.D.Student helpers who did well can get prizes.第二节阅读填空During the 2016 RIO Olympics, people were surprised to see the round, purple marks on the body of the famous American swimmer Michael Phelps. ____46____ In fact, he just visited a doctor of traditional Chinese Medicine (TCM) and had “cupping (拔火罐)”.TCM is an important part of Chinese culture. The earliest medical classic in China, Huangdi’s Classic on Medicine (《黄帝内经》), came out more than 2000 years ago. ____47____ In Chinese culture, yin and yang are two parts of nature. Nature keeps balanced if yin and yang work well together. ____48____ TCM helps to do that. Quiet specially, for some health problems, a doctor of TCM will not give you medicine. Instead, he may give you just a food plan and right ways to eat.For example, it is common to eat on the way to school, at our desk, or in front of the TV. ____49____ Here are the correct ways: Sit down to eat. While eating, turn off the TV and get away from the work desk. Eat seasonal foods. Do not miss any of the three meals. Also, get your body moving often, just as the saying goes, “Running water is never stale.”Nowadays, traditional Chinese medicine is becoming more and more popular around the world. ____50____四、写作第一节单词拼写51.Della felt sad because she could not a____________ a present for her husband.52.The n__________ called The Adventures of Tom Sawyer attracts teenagers around the world.53.Angela was l__________ because she won a prize to the lovely city of Paris.54.A balanced d__________ means having different kinds of healthy food every day.55.I enjoy helping my mum cook a delicious m___________ in my spare time.56.Aunt Polly wants Tom to paint their fence. However, Tom is l___________. He would prefer to play games.第二节完成句子57.真可惜啊！Tom不能和我们一起出去玩。
广东省广州市荔湾区2018-2019学年高二上学期期末教学质量监测英语试题含详解
2019年5月2018——2019学年第一学期期末教学质量检测高二英语试卷分第Ⅰ卷（客观题）和第Ⅱ卷（主观题）两部分。
试卷共8页，卷面满分135分。
考试用时120分钟。
注意事项：1. 答题前，考生务必在答题卡上用黑色钢笔或签字笔填写自己的学校、班级、姓名、试室号、座位号和考生号，再用2B铅笔把考生号的标号涂黑。
2. 全部答案必须在答题卡上完成，答在本试卷上无效。
3. 选择题每小题选出答案后，用2B铅笔把答题卡上对应题目的答案标号涂黑；如需改动，用橡皮擦干净后，再选涂其它答案；答案不能答在试卷上。
4. 非选择题必须用黑色字迹的钢笔或签字笔作答，答案必须写在另发的答题卷各题目指定区域内的相应位置上；如需改动，先划掉原来的答案，然后再写上新的答案；不准使用铅笔和涂改液。
不按以上要求作答的答案无效。
5. 考生必须保持答题卡的整洁。
考试结束后，将答题卡交回。
第Ⅰ卷（满分70分）第一部分阅读理解（共两节，共20小题，满分40分）第一节（共15小题；每小题2分，满分30分）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，并在答题卡上将该项涂黑。
(A)I first began experiencing anxiety and depression at the age of 14, after being bullied (欺凌) at school for years. While at first anxiety and depression would come and go, it eventually became a constant part of my life.I was so eager to find the solution to overcoming my anxiety and depression that I tried everything from when I was in college to graduate school: mood-changing medication, special teas, yoga, anything I read about in books, and advice given by doctors. Despite this, I still fe lt I hadn’t even come close to managing the problem.But one afternoon, my eyes fell upon an article in a magazine I was reading that talked about how dogs were able to help people with anxiety and depression. The verynext day, I decided to get a dog—a corgi. When I brought my little corgi, Buddy, home. I didn’t realize how much he would change my life. It didn’t happen right away, however.Once the “puppy excitement” went away, my anxiety and depression came back as usual. One morning, I woke up with those familiar feeli ng again. I didn’t want to get out of bed. I turned to pull the covers back over my head and give up. That’s when I saw Buddy.Buddy started jumping all over me, licking my face, letting me know that it was time to go outside. It was as if he were saying, “There’s no time to be sad; the world is amazing!” And for the first time in my life, my life was changing. I really was a new person. This was my new beginning.It’s been more than a year since that day, and I’ve never spent another mornin g unable to get out of bed. I’ve not cried myself to sleep or spent my days stuck with fear and regret. Sure, I still have days when I feel sad or anxious. But with Buddy, my best friend, by my side, I’ve finally learned how to manage these feelings and emotions.1. According to the first two paragraphs, the author ________.A. has been a school bully for yearsB. suffered from depression since collegeC. tried many ways to fight depression but nothing workedD. felt less depressed after taking medication and doing yoga2. How did the author know having a dog might help with her depression?A. a doctor put it forward to her.B. She read it in an article by chance.C. She heard it from some other depression sufferers.D. She found out herself after spending some time with a corgi.3. How does the author feel in the last paragraph?A. hopefulB. AnxiousC. ConfusedD. Doubtful【答案】1. C 2. B 3. A【分析】本文是一篇记叙文，讲述了作者在学校被欺负后开始焦虑和抑郁，偶然在一篇文章中作者了解到宠物狗可能是治疗抑郁的好办法。
2018七上英语荔湾区期末考带答案
荔湾区2019学年第一学期期末教学质量检测七年级英语本试卷共四大题,共8页,满分100分;考试时间90分钟注意事项:1.答卷前,考生务必在答题卷上用黑色钢笔或签字笔填写自己的学校、班级、姓名同时填写考生号、座位号,再用2B铅笔把对应这两个号码的标号涂黑。
2..选择题每小题选出答案后,用2B铅笔把答题卷上对应题目的答案标号涂黑。
如需改动,用橡皮擦干净后,再选涂其他答案。
3.非选择题必须用黑色字迹的钢笔或签字笔作答,答案必须写在答题卷各题目指定区域的相应位置上:如需改动,先划掉原来的答案,然后再写上新的答案,改动的答案也不能超出指定的区域;不准使用铅笔、圆珠笔和涂改液。
不按以上要求作答的答案无效。
4.考生必须保持答题卷的整洁,考试结束,将答题卷交回。
一、单项选择(共20小题；每小题1分，满分20分)第一节语音(共5小题；每小题1分，满分5分)从1~5各题所给的A、B、C和D项中，选出及所给单词的划线部分读音相同的词，并在答题卷上将该项涂黑。
(共5小题；每小题1分，满分5分)1. many A. meat B. great C. bread D. teacher2. shine A. guide B. bridge C. minute D. swim3. thank A. other B. either C. these D. think4. warned A. opened B. attended C. asked D. joined5. town A. yellow B. follow C. brown D. throw第二节语法(共15小题；每小题1分，满分1分)从6~20各题所给的A、B、C和D项中选出可以填入空白处的最佳选项，并在答题卷上将该项涂黑。
6. Tom likes maths and science. He hopes to be ______ engineer.A. aB. anC. theD.不填7. Many teenagers in China enjoy ______ now. They often read books in the library.A. readB. readsC. readingD. to read8. I don’t want to eat ______ any more. I like to eat pork.A. chickenB. a chickenC. chickensD. the chickens9. My mum ______ me some Chinese exercises every day.A. giveB. givesC. givingD. is giving10. Today is a ______ day The sun shines ______.A. sun; brightB. sun: brightlyC. Sunny; brightD. sunny: brightly11. My parents and I like to have supper at home, so we ______ go to have dinner in the restaurants.A. seldomB. alwaysC. sometimesD. often12. Mary dropped her bowl and it ______.A. breaksB. broke C is breaking D. will break13. It takes us four days ______ to space by spaceshipA. getB. gotC. gettingD. to get14. If he ______ time, he ______ museum this Sunday morning.A. has; visitsB. as; will visitC. will have; visitsD. will have; will visit15. --______ are you talking about?-- The Olympics Games in Tokyo.A. WhatB. WhomC. whenD. Where16. ______ a book and four photos on the desk.A. There isB. There areC. There hasD. There have17. The Earth provides us ______ air, water and food.A. forB. withC. toD. at18. Linda and Leo felt ______ when they saw the rocket disappear into the sky.A. surpriseB. surprisingC. surprisedD. surprisingly19. This is not ______ book. It is ______.A. my, yourB. mine, yoursC. my; yoursD. mine, your20. -- You look very pretty today.-- __________A. Oh, I don’t.B. Thank you.C. The same to you.D. No, I’m not.二、完形填空(共10小题；每小题1分，满分10分)阅读下面短文，掌握其大意，然后从21~30各题所给的A、B、C和D项中，选出最佳选项，并在答题卷上将该项涂黑。
广东省广州市荔湾区2018-2019学年高一上学期期末考试物理试题PDF版含答案
2018-2019学年第一学期期末教学质量检测高一物理最新试卷多少汗水曾洒下，多少期待曾播种，终是在高考交卷的一刹尘埃落地，多少记忆梦中惦记，多少青春付与流水，人生，总有一次这样的成败，才算长大。
温馨提示：多少汗水曾洒下，多少期待曾播种，终是在高考交卷的一刹尘埃落地，多少记忆梦中惦记，多少青春付与流水，人生，总有一次这样的成败，才算长大。
高考保持心平气和，不要紧张，像对待平时考试一样去做题，做完检查一下题目，不要直接交卷，检查下有没有错的地方，然后耐心等待考试结束。
本试卷分第一部分（选择题）和第二部分（非选择题），共100分．考试时间90分钟．注意事项：1．答题前，考生务必用黑色字迹的签字笔在答题卡上填写姓名、考号和座位号，再用2B铅笔将与考号和座位号对应的信息点涂黑．2．答题卡上第一部分必须用2B铅笔作答，将选中项涂满涂黑，黑度以遮住框内字母为准，修改时用橡皮擦除干净．第二部分必须用黑色字迹的签字笔按照题号顺序在各题目的答题区域内作答，未在对应的答题区域内作答或超出答题区域作答的均无效．3．考生务必将答案写在答题卡上，在试卷上作答无效．第一部分选择题（共56分）一、单项选择题（本题只有一个选项正确，共12小题，每小题3分，共36分）1．下列说法正确的是A．kg、m/s、N是导出单位B．质量、长度、时间是基本单位C．在国际单位制中，质量的基本单位是gD．在F kma中，k的数值由F、m、a的单位决定2．关于惯性，下列说法正确的是A．静止的物体没有惯性，运动的物体才有惯性B．物体的质量越大，惯性越大C．正在行驶的两辆汽车，行驶快的不易停下来，所以速度大的物体惯性大D．自由下落的物体处于完全失重状态，物体的惯性消失3．足球运动是目前全球体育界最具影响力的项目之一，深受青少年喜爱．如图所示为三种与足球有关的情景．下列说法正确的是A．甲图中，静止在草地上的足球受到的弹力就是它的重力B．乙图中，静止在光滑水平地面上的两个足球由于接触而受到相互作用的弹力C．丙图中，落在球网中的足球由于离开了地面，不再受到重力作用D．丙图中，落在球网中的足球受到弹力是由于球网发生了形变4．如图，光滑、质量不均匀的球，球心于O1，重心于O2，放于凹槽上，接触点分别为a和b．关于在a处，槽对球的弹力方向的说法正确的是A．由a指向O1B．由a指向O2C．由a指向b D．竖直向上5．如图，粗糙的水平地面上有一斜劈，斜劈上一物块正在沿斜面以速度v0匀速下滑，斜劈保持静止，则物块受到的力有哪些A．重力、沿斜面向下的滑动摩擦力、斜面的支持力B．重力、沿斜面向上的滑动摩擦力、斜面的支持力C．重力、沿斜面向下的下滑力、沿斜面向上的滑动摩擦力D．重力、沿斜面向下的下滑力、沿斜面向上的摩擦力、斜面的支持力6．关于速度、速度变化量、加速度，说法正确的是A．物体运动的速度变化量越大，加速度一定越大B．速度很大的物体，其加速度一定小，但不能为零C．某时刻物体速度为零，其加速度可能很大D．加速度很大时，运动物体的速度一定很大7．关于匀变速直线运动，下列说法中正确的是A．匀变速直线运动的加速度是大小恒定的，方向可以随时间而改变B．匀变速直线运动的速度－时间图象是一条倾斜的直线C．速度不断随时间增加的运动，叫做匀加速直线运动D．匀加速直线运动中，加速度一定为正值8．物体受到下列几组共点力的作用，其中一定能使物体产生加速度的是A．1N、3N、5N B．2N、4N、6NC．3N、5N、7N D．4N、6N、8N9．如图，水平地面上质量为m的物体连着一个劲度系数为k的轻弹簧，在水平恒力F作用下做匀加速直线运动．已知物体与地面间的动摩擦因素为，重力加速度为g，弹簧没有超过弹性限度，则弹簧的伸长量为A．mgkB．mgkC．FkD．F mgk10．如图所示，物块恰能沿斜面匀速下滑，运动过程中若在物块上再施加一个竖直向下的恒力F，则A．物块仍匀速下滑B ．物块将加速下滑C ．物块将减速下滑D ．物块如何运动要看F 的大小11．甲、乙两物体从同一位置出发沿同一直线运动的v －t 图象如图所示，下列判断正确的是A ．甲物体一直处于静止状态B ．2s 后，甲、乙两物体的速度方向相反C ．乙在0-2s 速度大于甲，在2-6s 速度小于甲D ．两物体两次相遇的时刻分别在2s 末和6s 末12．甲、乙两物体质量之比是1∶2，体积之比是4∶1，同时从同一高度自由下落，则下落加速度之比和下落时间之比分别为A ．1∶1 1∶8 B ．1∶11∶2 C ．1∶21∶4D ．1∶11∶1二、多项选择题（本题共5小题，每小题4分，共20分．在每小题给出的四个选项中至少有两个选项符合题目要求．全部选对得4分，选对不全得2分，有选错或不答的得分）13．对于站在电梯里的人，以下说法中正确的是A ．电梯向下加速时，电梯对人的支持力小于重力B ．电梯减速下降时，电梯对人的支持力大于重力C ．电梯对人的支持力在电梯上升时可能比下降时大D ．电梯下降时人对电梯的压力总比上升时大14．在如图所示的位移—时间(x-t)图象和速度—时间(v-t)图象中，给出的四条图线甲、乙、丙、丁分别代表四辆车由同一地点向同一方向运动的情况，则下列说法正确的是A ．t 1时刻，乙车追上甲车B ．0～t 1时间内，甲、乙两车的平均速度相等C ．丙、丁两车在t 2时刻相遇D ．0～t 2时间内，丙、丁两车的平均速度相等15．如图，P 、B 间轻线沿竖直方向，Q 、A 间轻线沿水平方向，重球A 、B 均静止，关于两球的受力个数，正确的是A ．球A 受四个力B ．球A 受三个力C ．球B 受三个力tvO丙丁2t txO乙甲1t QD ．球B 受两个力16．如图所示，把质量为m 的球夹在竖直墙壁AC 和木板BC 之间，不计摩擦，绕C 点将板BC 缓慢放[至水平的过程中，下列说法正确的是A ．球对墙的压力减小B ．球对墙的压力增大C ．球对板的压力减小D ．球对板的压力先增大后减小[来源:]17．如图所示，表示做直线运动的某一物体在0～5 s 内的运动图象，由于画图人粗心未标明是速度-时间v-t 图还是位移-时间x-t 图，但已知第 1 s 内的速度小于第3 s 内的速度，下列说法正确的是A ．该图一定是v-t 图B ．该图一定是x-t 图C ．物体的速度越来越大D ．物体的位移越来越大第二部分非选择题(共44分)三、实验探究题（共10分）18．(4分)在“探究合力与分力的关系”的实验中某同学的实验情况如图所示，其中A 为固定橡皮条的图钉，O 为橡皮条与细绳的结点，OB 和OC 为细绳．(1)本实验中，采取下列哪些方法和步骤减可以减小实验误差A ．细绳OB 和OC 的夹角越大越好B ．拉橡皮条的细绳要稍长一些C ．实验中，弹簧测力计必须与木板平行D ．读数时视线要正对弹簧测力计刻度(2)如果用两测力计向下拉橡皮筋的下端至O 点，而两测力计不是沿AO 线对称的方向，将___________（填“会”或“不会”）影响实验结果。
广州市荔湾区2018-2019学年第一学期人教版数学六年级上册期末试卷
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广州市荔湾区2018-2019学年第一学期期末考试 初一年级 语文 试卷及参考答案
1（234初一（2）班召开《西游记》读书分享会，主题是“最精彩的一幕”，每位同学选取自己认为小说中5最精彩的一个情节，写一段话，向大家介绍。
要求：①简要概括情节；②一句话点评精彩之处；③不超过60字。
古诗文默写（10分）6饭疏食饮水，，乐在其中矣。
(《论语》)7日月之行，若出其中；，若出其里。
（曹操《观沧海》）8正是江南好风景，。
（杜甫《江南逢李龟年》）9，却话巴山夜雨时。
（李商隐《夜雨寄北》）10，小桥流水人家。
（《天净沙·秋思》)11终古高云簇此城，。
（谭嗣同《潼关》）根据语境，在横线上填入最恰当的古诗文名句。
12风顺浪静之时，在三峡行船，看到这江面开阔、潮涨水漫的景象，他忍不住吟咏出王湾《次北固山下》的诗句：“ ，。
“张明挥笔写下诸葛亮《诫子书》中的名句“ ， ”以表达自己明确志向、努力达到远大13目标的决心。
根据课本，解释下面句子中加点词的意义。
14（1）险躁则不能治性。
(《诫子书》)（2）意将隧入以攻其后也。
(《狼》)（3）只使坠，亦不能有所中伤。
(《杞人忧天》)（4）好之者不如乐之者。
(《论语》)（5）友人惭，下车引之。
（《陈太丘与友期行》）阅读下面的文段，完成下面小题。
宋之丁氏，家无井而出溉汲，常一人居外。
及其家穿井，告人口：“吾穿井得一人。
”有闻而传之者：“丁氏穿井得一人。
”国人道之，闻之于宋君。
宋君令人问之于丁氏。
丁氏对曰：“得一人之使，非得一人于井中也。
”求闻之若此，不若无闻也。
（选自《吕氏春秋》）15 A.家无井而出溉汲 汲：从井里取水B.及其家穿井 及：待，等到C.丁氏对曰 对：应答，回答D.不若无闻也 闻：使……听说下列句子中，加点词的意义理解不正确的一项是（1）用现代汉语翻译下列句子。
（2）国人道之，闻之于宋君。
1得一人之使，非得一人于井中也。
2联系现实生活，这则寓言给你什么启发？（3）阅读下面的唐诗，然后回答问题 。
行军九日思长安故园[唐]岑参强欲登高去，无人送酒来。
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1广州市荔湾区2018-2019学年第一学期期末教学质量检测 九年级化学可能用到的相对原子质量：H-1 C-12 O-16 N-14 S-32第一部分 选择题（共40分）一、选择题（本题包括20小题，每小题2分，共40分） 1．化学使世界变得更加绚丽多彩，下列对化学认识错误的是A.利用化学合成药物，以抑制细菌和病毒，保障人体健康B.化学物质会造成环境污染，所以禁止一切化学药品的使用C.利用化学开发新能源和新材料，改善人类的生存条件D.化学是一门以实验为基础的科学，许多化学的重大发现和研究成果都是通过实验得到的 2．某矿泉水标签上印有的主要矿物质成分及含量如下（单位为mg/L ）:Ca ～20、K-3、Zn ～0.06、F ～0.02等。
这里的Ca 、K 、Zn 、F 是指 A.原子 B.分子 C.单质 D.元素 3．下列物质的用途中，只利用其物理性质的是A.千冰用作冷冻剂B.常温下，炭黑用作墨汁C.氧气用作气焊D.生石灰用作干燥剂4．十九大报告强调必须树立和践行”绿水青山就是金山银山”的理念，坚持节约资源和保护环境的基本国策。
对此，我国2018年环境日提出了“美丽中国，我是行动者”的主题。
下列做法符合这一理念的是 A.生活污水直接排放到河涌中B.在种植农作物时，为了增产可大量使用化肥和农药C.化工厂产生的有害气体不经处理就排放到大气中D.工业用水经处理后重复利用 5．PD-L1是一种免疫抑制剂，用于治疗晚期癌症病人效果显著，其化学式为C 29H 33NO 5，下列关于PD-L1说法正确的是 A.PD-L1是一种氧化物B.PD-L1的相对分子质量为:475gC.PD-L1分子中C 、H 、N 、O 的原子个数比:29:33:1:5D.PD-L1中氧元素的质量分数为: 1612×29+1×33+14+16 ×100％6．右图是某粒子的结构示意图，下列关于该粒子的说法错误的是A.图中x ＝8B.该粒子中能量最低的电子层上有1个电子C.在化学反应中该粒子易失去电子D.该粒子的核电荷数为11 7．化学是一门以实验为基础的科学。
下列实验操作正确的是A.取固体药品B.添加酒精C.检验氢气纯度D.代替玻璃棒进行搅拌8．工业上把氯气通入冷的熟石灰中制得漂白粉［效成分Ca(ClO)2，其反应的化学方程式为 2C12＋2Ca(OH)2 === Ca(ClO)2＋CaCl 2＋2X ，则X 的化学式为A ．HClB ．H 2C ．H 2OD ．CaO9．下列关于能源、资源的叙述正确的是A.石油炼制可得到汽油、柴油、煤焦油等B.氢气还不能作为燃料被广泛使用的主要原因是其制取成本高、贮存困难C.海水中含有的化学元素有80多种，其中含量最多的元素是氢元素D.地球上的水储量是丰富的，可供利用的淡水资源也是丰富的 10．学习化学以后，我们对水有了更全面的认识。
下列说法正确的是A.在自来水厂净化水的过程中，用了沉淀、过滤、吸附等净化方法B.生活中常用蒸馏来降低水的硬度C.水的天然循环主要是通过化学变化完成的D.电解水时在负极得到氧气 11．下列有关金刚石、石墨、C 60的说法中，正确的是A.C 60是一种新型的化合物B.石墨是天然存在最硬的物质C.金刚石、石墨、C 60在氧气中充分燃烧后的生成物都是二氧化碳D.金刚石与石墨物理性质不同的原因是碳原子的结构不同 12．下列成语不涉及燃烧条件和灭火原理的是A.釜底抽薪B.火上浇油C.钻木取火D.水滴石穿13．2018年，美国特朗普正式签署关税令对进口钢铁和铝分别征收25％的关税”，这一做法严重违反国际贸易规则，严重损害我国利益。
下列选项中不属于合金的是A.钢B.生铁C.硬铝D.铝 14．据报道，中国科学技术大学研究人员利用钴及其氧化物成功研制出一种新型催化剂，可将二氧化碳高效“清洁”地转化成液体燃料，其转化的微观示意图如下图。
有关该反应的说法错误的是 A.反应前后原子种类减少 B.反应前后碳元素质量不变C.得到的液体燃料化学式是CH 2O 2D.可用于减少温室气体的排放16．下列鉴别物质的方法中，错误的是A.通过点燃气体观察火焰的颜色鉴别氢气和甲烷B.通过燃着的木条鉴别氧气和氮气C.通过加热法鉴别黄金和黄铜D.通过观察固体颜色鉴别高锰酸钾和氯酸钾17．建立模型是学习化学的重要方法，下列有关模型正确的是A.原子结构模型B.燃烧条件模型C.空气组成模型D.物质分类模型19．空气是一种宝贵的自然资源。
下列有关空气的说法错误的是A.空气中的氧气能支持燃烧，可做燃料B.空气中各成份的含量不是恒定不变的C.空气中的有害气体和烟尘对空气造成污染D.空气中的稀有气体都没有颜色、没有气味，化学性质很不活泼 20．下列实验方案的设计中，没有正确体现对比这种科学思想的是A.探究金属活动性B.探究燃烧条件C.区别硬水和软水D.探究CO 2与水反应第二部分 非选择题（共60分）二、填空题（本题包括6小题，共31分） 21．（4分）用化学用语或名称填空: （1）2个钙离子________，（2）碳酸钠___________，（3）Al(OH)3__________ （4）已知过氧化氢中氧元素的化合价是-1价，则过氧化钠的化学式为_____________ 22．（4分）某化学反应的微观示意图如下:（1）上述微观示意图中，属于非金属单质的是_________（填化学式）； （2）该反应的化学方程式为___________________________ （3）下列物质能与镁发生化学反应的是_________（填字母）。
A.稀盐酸B.硫酸钠溶液C.硫酸铜固体D.氧气 23．（7分）2017年9月2日，我国成功提纯了“超级金属”铼。
右图是铼在周期表中的相关信息。
铼是一种银白色金属，它在制造火箭、导弹上用作耐高温涂层。
在高温下用氢气还原高铼酸铵（NH 4ReO 4）可制成金属铼。
请回答下列问题: （1）上述信息中，铼的原子序数为_________，金属铼的物理点燃反应前 反应后镁原子碳原子干燥紫色 石蕊纸花湿润紫色 石蕊纸花CO 2CO 2加入等量 的肥皂水2mL 1mL硬水 软 水大小形状相同5mL10%的 硫酸溶液5mL10%的 硫酸溶液铁片锌片① ②滤纸片 乒乓球碎片薄铜片电子原子核质子固体 温 度气体 (按体积计)N 2:78% O 2:21%其他成分:1%混合物纯净物 化合物新型催化剂氢原子氧原子碳原子2性质是______________________________________________。
（2）高铼酸铵（NH 4ReO 4）中铼元素的化合价为_________。
（3）铼在高温下能与硫化合形成二硫化铼，写出反应的化学方程式____________________________________。
二硫化铼中硫元素与铼元素的质量比为_________。
24．（6分）在学习中我们通过实验观察到几种物质的燃烧现象：（1）蜡烛在空气中燃烧可以观察到明亮的黄色火焰，在氧气中燃烧的火焰颜色呈白色（发出白光）；铁在空气中加热只能产生红热现象，而在氧气中点燃细铁丝可观察到的现象是__________________________。
（2）由此小丽对物质燃烧时产生火焰的原因感到困惑，在查阅资料之后整“气”）态物质燃烧形成的。
②由表中信息以及你所学知识，可以推测:a 钠燃烧时__________（填“有”或“无”）火焰产生；b 硫粉的沸点__________（填“＞”或“＜”）燃烧时的温度，推测的依据是____________________，其燃烧的化学方程式为______________________________。
25．（6分）下图几种物质的转化关系中，已知A 、B 、E 是三种无色无味的气体，其中E 是一种供给动植物呼吸的气体，C 是目前世界年产量最高的金属，D 、F 、H 都是含有钙元素的化合物，请回答下列问题:（1）E 的化学式是__________。
（2）稀盐酸与C 反应生成A 的实验现象是生成物除A 外，另一种生成物的化学式是__________。
（3）B ＋F →D 的化学方程式为_________________________________。
（4）G ＋H →F 的反应是____________（填“放热反应”或“吸热反应”）。
26．（4分）工业上用液氨（NH 3）制取硝酸（HNO 3），生产流程如下图所示:以下是流程中涉及的化学反应：①4NH 3＋5O 2=======催化剂加热4NO ＋6H 2O②2NO ＋O 2＝2NO 2③3NO 2＋H 2O ＝2HNO 3＋NO （1）液氨转化为氨气的过程属于_________（填“物理变化”或“化学变化”） （2）以上三个反应中属于化合反应的是__________（填序号）（3）物质循环利用是绿色化学对化工生产的基本要求，该流程中可循环使用的含氮化合物是_____________（填物质名称）（4）请计算理论上要生产得到12.6t 硝酸，至少需要液氨_________t 。
三、实验题（本题包括3小题，共29分） 27．（9分）实验探究一:探究红砖粉末能否作为过氧化氢溶液分解的催化剂？如果能，催化效果如何？探究小组据此设计了如下探究方案。
步骤Ⅱ.向试管B 中重新加入5％的过氧化氢溶液，反应停止后过滤、洗涤、干燥、称量滤渣 步骤Ⅲ【拓展应用】探究小组利用以下仪器进一步验证4氢的分解也具有催化作用”，请回答:A B C D （1）写出仪器C 的名称: _____________；（2）从方便取用液体并节约试剂的角度考虑，该探究小组最好选用以上所示仪器中的_____________（填字母）实验探究二:探究过氧化氢分解的影响因素。
探究小组使用压强传感器等设备，检测不同温度下过氧化氢分解时气体压强的变化。
经过实验、数据处理等，获得如下图所示的压强时间变化曲线。
由此可知，过氧化氢的分解速率与温度之间的关系是_______________________________________________。
28.（9分）同学们在学习了焦炭还原氧化铁的反应后，联想到单质碳的一些化学性质，对反应后的气体成份产生了疑问，并对其气体成份进行了如下探究。
【猜想】①气体产物全部是CO 2； ②气体产物全部是__________；③气体产物是CO 和CO 2的混合物。
【查阅资料】CO 气体能使湿润的黄色氯化钯试纸变蓝色。
【设计实验】根据各自的猜想，他们共同设计了如下图的实验装置进行探究。
【反思】（1）同学们对CO 产生的原因进行了分析:首先Fe 2O 3与焦炭反应，生成的其中一种产物和焦炭又发生了化学反应，产生了CO ；请你用化学方程式表示生成CO 的原因______________________________________、 _________________________________________________。