问题 不定项选择题

某探究小组利用丙酮的溴代反应(CH3COCH3+Br2→CH3COCH2Br+HBr)来研究反应物浓度与反应速率的关系。反应速率v(Br2)通过测定溴的颜色消失所需的时间来确定。在一定温度下,获得如下实验数据:

分析实验数据所得出的结论不正确的是 [ ]

A.增大c(CH3COCH3),v(Br2)增大

B.实验②和③的v(Br2)相等

C.增大c(HCl),v(Br2)增大

D.增大c(Br2),v(Br2)增大

答案

答案:D

单项选择题
阅读理解

.

Dear Cassy,

Thanks for reminding me by e-mail that you want to baby-sit our children. Although you are only 12 years old, my wife and I would be willing to consider your application(申请)if you can meet(满足) a few requirements:

1)Send us three letters from teachers who will prove that you have never failed to follow instructions perfectly in class and never failed to hand in your homework on time.

2)Send us a note from two doctors who will prove that you are in perfect health, have never been sick, and never will be sick.

3)Send us a document from your physical education teacher or team coach that proves that you can do each of the following: Run two miles in less than four minutes, climb an oiled rope to a height of twenty feet in thirty seconds while balancing a glass of water on your nose, and walk in bare feet over hot coals and broken glass without injury.

4)Send us notarized(得到公证的)letters from at least two mental health experts saying that you have never had an envious thought towards other people.

5)Play and defeat five expert chess players while blindfolded(蒙着眼睛)after going without sleep for 48 hours.

6)Wait patiently(耐心地)for two years while we have investigators(调查)certify(确保)that all your documents(文件)are real

Your loving and trusting friends,

The Smiths

40. The Smiths send their message to Cassy by     .

A. e-mail       B. a letter        C. a newspaper    D. a report

41. According to the first paragraph,        .

A. the Smiths must have had an advertisement made, saying that they want someone to look after their children

B. the Smiths have informed Cassy that they need some children

C. the Smiths have promised to provide what Cassy asked for

D. the Smiths would be very glad if Cassy can meet their requirements

42.What is the attitude of the Smiths about hiring the 12-year old girl to look after their baby?

A. The Smiths try to tell her how to baby-sit children.

B. The Smiths don’t think a girl is good for the job.

C. The Smiths don’t want to hire her.

D. The Smiths are willing to offer her the job.

43. Which of the requirements mentioned by the Smiths do you think Cassy can meet?

A. All of them               B. Half of them  

C. None of them             D. Most of them