问题 选择题

下列各方案中,你认为可行的是(  )

A.按溶解、过滤、蒸发的操作顺序,可以分离CaCl2和Na2CO3的混合物

B.用NaOH溶液可除去二氧化碳中混有的少量氯化氢杂质

C.除去H2中混有的HCl,将气体通过装有NaOH溶液的洗气瓶

D.除去CO2中混有的少量CO杂质,可将气体导出点燃

答案

答案:C

选择题
阅读理解

阅读理解。

     Bill and his family has been living in the six-family building for years. All the neighbors got

along fairly well with each other until recently.

     An old man and his wife used to live on the second floor. Bill's mother and the old lady were

good friends. Unfortunately the lady died last month. Her husband could not live alone, so he had

his grandson move over and live with him.

     The grandson has become a problem to all the neighbors, especially to Bill's family. The walls

of the buildin g are thin and he is noisy. Bill is used to peace and quiet but the young man likes to

listen to the radio late at night. Sometimes friends of his visit and they make a lot of noise. That is

too much for Bill's family.

      Bill's mother once asked the old man politely if he was able to sleep well at night, but obviously

the man didn't understand what she meant. If he did and spoke to his grandson, the young man

obviously didn't listen, since things haven't changed any. Everyone in Bill's family agrees that

something must be done though they don't want to hurt the kind old man.

1. Bill's family got angry because ________.

A. the old lady had died

B. a young man moved in

C. the old man could not live alone

D. the grandson made a lot of noise

2. Which of the following statements is true?

A. The old man could not live without his wife's help.

B. The old man and his wife were sometimes making trouble too.

C. Bill's mother was kind to her neighbors.

D. Bill's mother was the only one who likes the young man.

3. The grandson makes a lot of noise as ________.

A. he never thinks other people might not be happy with so much noise around

B. the walls of the building are thin

C. he likes to listen to the radio at night

D. friends of his visit

4. It seems that ________to solve the problem.

A. anyone is able

B. only the grandfather is going

C. Bill's mother is able

D. nobody is likely