问题 单项选择题

碘量法测定酒精中醛的含量,下面有关解释不正确的是()。

A、用亚硫酸氢钠与醛起加成反应

B、用碘来氧化过量的亚硫酸氢钠

C、加入少量碳酸氢钠,调节溶液PH值

D、用碘滴定从与醛结合中游离出来的亚硫酸氢钠

答案

参考答案:C

阅读理解

阅读理解。

    Once upon a time, there lived a rich man. He had a servant (仆人). He and the servant loved wine (酒)

and good food very much. Each time the rich man left his home, the servant would drink the wine and

eat up all the nice food in the house. The rich man knew what his servant did, but he had never caught

his servant doing that.

    One morning, when he left home, he said to the servant, "Here are two bottles of poison (毒药) and

some nice food in the house. You must take care of them." With these words, he went out.

    But the servant knew what the rich man had said was untrue (假的), after the rich man was away

from his home, he enjoyed a nice meal. Because he drank too much, he was drunk and fell to the ground.

When the rich man came back, he couldn't find his food and his wine. He became very angry. He woke

(叫醒) the servant up. But the servant told his story very well. He said a cat had eaten up everything. He

was afraid to be punished (被惩罚), so he drank the poison to kill himself.

1. In the story, _____ liked wine and good food very much. [ ]

A. the rich man

B. the servant

C. both A and B

D. neither A and B

2. The rich man knew that it was _____ that drank the wine and ate up all the nice food.[ ]

A. the cat

B. himself

C. nobody

D. the servant

3. The rich man told the servant that there was poison in the two bottles, because _____. [ ]

A. there was in fact poison in the bottles

B. he did not want the servant to drink his wine

C. he wanted to kill the cat

D. he wanted to kill the servant

4. In fact _____ ate all the nice food and drank the wine.[ ]

A. the servant

B. cat

C. the rich man

D. nobody

5. From the story, we know that the servant is very _____. [ ]

A. lazy

B. bad

C. clever

D. kind

多项选择题