问题 阅读理解

阅读理解。

Dear Victor,

     I am a college student. Nowadays games on the net are very popular with college students.Some of

my roommates are very interested in them. They not only play games in their free time, but also keep

talking about them at night when lights are off, and they regard games as part of life. I've begged them to

give it up, but they wouldn't listen to me. It has become a rather big problem. Should I report it to our

teachers or do something else?

                                                                                                                                           Ted

Dear Ted,

     Drop it. Your roommates, as grown-ups, can do whatever they want with their time so long as it doesn't break school rules or violate (妨碍) other people's interests.

     Playing perhaps gives these students relaxation(放松) from hard study. If they play too often, have

little time to study, and they will reap what they have sown. but you will not. Reporting to the teachers

would only harm your good name in your dormitory. However you have rights to ask your roommates to

be quiet when you need sleep. If they aren't angry with you, they will stop talking. But be polite and

friendly. Perhaps, in return, join them in a game or two.

                                                                                                                                         Victor

1. According to the first letter, many college students enjoy _________.    

A. playing computer games

B. searching information on the Internet

C. sending e-mails

D. buying things online

2. Ted wants his roommates to _________

A. break their computers

B. sell their computers to teachers

C. stop playing computer games

D. play games in the day, not at night

3. According to the second Jetter, some college students _________    

A. can violate school rules or other people's interests

B. have their rights to quarrel with Ted

C. can relax themselves while playing games on the net

 D. can study even better if they play games on the net

4. Victor asks Ted to _________.

A. report to the teachers

B. harm his good name in the dormitory

C. quarrel with his roommates

D. learn how to get on well with others

5. In the second letter, the underlined part means __________.

A. 自食其果

B. 随心所欲地做事

C. 回家种庄稼

D. 逃避责任

答案

1-5 ACCDA

问答题

实验盒中有5种没有标签的溶液,老师让实验小组同学鉴别这些溶液.

[调查研究]

①实验盒中记录单上登记的5种溶液是:Na2CO3、CuSO4、Ca(OH)2、NaOH和稀盐酸,其中有颜色的是______溶液;

②查阅资料:无色有刺激性气味的氯化氢气体溶于水得到盐酸;

③研究方式:从4种无色溶液中任意取出3种为一组进行鉴别.

[提出假设]同学们从4种无色溶液中取出3种,贴上A、B、C标签,并且假设这一组溶液可能是Na2CO3、Ca(OH)2和NaOH.

[实验探究]同学们按以下步骤进行鉴别:

第一步取3支试管,分别加入少量的A、B、C溶液,然后依次加入少量盐酸,实验现象记录如下:

溶液ABC
加入盐酸后的现象无明显变化无明显变化有气泡产生
实验结论:C是______溶液.

第二步依据如图装置进行实验,其中夹持固定装置已略去.从长颈漏斗加入盐酸,可以观察到C溶液中气泡产生,A溶液中有白色沉淀生成,B溶液无明显变化.

实验解释:

①A溶液中产生的白色沉淀是______(写出化学式),

则A是______溶液.

②写出C溶液中发生反应的化学方程式______.

第三步取少量B溶液倒入蒸发皿,加热,闻到有刺激性气味,

停止加热.

实验结论:B是______溶液.

经过上述三步实验,同学们认为最后一种溶液是______溶液.

[实验反思]老师提出:鉴别出C溶液后,不需外加试剂,就可以简便地鉴别出A、B溶液.请完成下列实验报告.

实验步骤实验现象结论
取A、B两溶液分别于两支试管中,各滴加C溶液______该溶液是A 溶液
______该溶液是B溶液

多项选择题