问题 问答题

实验课上花花从老师提供的两瓶无标签的试剂瓶中分别取出少量固体和液体在试管中混合,立即看到有大量无色气体生成.大家对此实验展开了一系列探究活动:

(1)这种无色气体你猜想可能是______气体,写出生成该种气体的化学方程式:______.

(2)按照你的猜想,请根据提供的实验装置回答问题:实验室如果制取该种气体,可以选用的发生装置为(填序号)______,能否选用C置收集这种无色气体(填“能”或“不能”)______,原因是______.

答案

(1)固体和液体直接反应产生的气体可以是氧气(2H2O2

 催化剂 
.
 
2H2O+O2↑)、二氧化碳(CaCO3+2HCl=CaCl2+H2O+CO2↑)、氢气(Zn+H2SO4═ZnSO4+H2↑).故答案为:氧气;2H2O2
 催化剂 
.
 
2H2O+O2

(2)A装置是加热固体制取气体的发生装置,B装置是固液在常温下反应制取气体的发生装置.实验室如果制取氧气或氢气或二氧化碳,可以选用的发生装置为B.氧气不易溶于水,氢气难溶于水,故两者可用排水法收集;二氧化碳能溶于水,不能用排水法收集.故答案为:B;能;氧气不易溶于水

选择题
阅读理解

阅读理解。

     An “apple polisher” is one who gives gifts to win friendship or special treatment. It is not exactly

a bribe(贿赂), but is close to it.

     All sorts of people are apple polishers, including politicians and people in high offices-just abou

t everybody. Oliver Cromwell, the great English leader, offered many gifts to win the support of

George Fox and his party, but failed.

     There are other phrases meaning the same thing as “apple-polishing”-“soft-soaping” or

“buttering-up”. A gift is just one way to “soft-soap” somebody, or to “butter him up”. Another

that is just as effective is flattery, giving someone high praise-telling him how good he looks, or how

well he speaks, or how talented and wise he is.

     Endless are the ways of flattery. Who does not love to hear it? Only an unusual man can resist the

thrill of being told how wonderful he is. In truth, flattery is good medicine for most of us, who get so

little of it.

     We need it to be more sure of ourselves. It cannot hurt unless we get carried away by it. But if we

just lap it up for its food value and nourishment, as a cat laps up milk, then we can still remain true to

ourselves.

     Sometimes, however, flattery will get you nothing from one who has had too much of it. A good

example is the famous 12th century legend of King Canute of Denmark and England. The king got

tired of listening to endless sickening flattery of his courtiers(朝臣). They overpraised him to the skies,

as a man of limitless might.

     He decided to teach them a lesson. He took them to the seashore and sat down. Then he ordered

the waves to stop coming in. The tide was too busy to listen to him. The king was satisfied. This might

show his followers how weak his power was and how empty their flattery.

1. Which of the following activities has nothing to do with “apple-polishing”?

A. A boy tells his girlfriend how pretty she looks.

B. An employee tells her boss how good he is at management.

C. A knight is said to be of limitless power by his followers.

D. A teacher praises her students for their talent and wisdom.

2. What does the writer want to prove with Cromwell’s example?

A. Everybody can be an apple-polisher.

B. Cromwell was not a good apple-polisher.

C. George Fox and his party were not apple-polishers.

D. There are people who don’t like being apple-polished.

3. Which of the following statements about flattery is true according to the author?

A. Too much flattery can carry us away.

B. Flattery is too empty to do people any good.

C. Flattery can get you nothing but excessive(过度的) pride.

D. Flattery is one of the ways to apple-polish people.

4. King Canute of Denmark and England took his follows to the seashore because _______.

A. he was sick of his normal life

B. he disliked being overpraised any more

C. he wanted them to realize how wise he was

D. he wanted them to see how weak he was as a king

5. The author thinks that flattery can do good to those who _______.

A. are politicians or in high offices            

B. lack confidence

C. are really excellent                      

D. think highly of themselves