问题 选择题

下列关于有机化合物的说法正确的是(   )

A.甲烷、乙烯和苯在工业上都是通过石油分馏得到

B.乙烯、苯都可以和氢气发生加成反应,都能使酸性高锰酸钾溶液褪色

C.蛋白质、淀粉、油脂都能发生水解反应,它们分子中所含元素种类相同

D.乙醇与乙酸生成乙酸乙酯和乙酸乙酯水解生成乙醇与乙酸的反应类型相同

答案

答案:D

石油裂解可以得到甲烷和乙烯等,苯可以通过煤的干馏获得,A项错误;乙烯能使酸性KMnO4溶液褪色,而苯不能,B项错误;蛋白质含有C、H、O、N,有的还含有P、S等,而淀粉、油脂只含有C、H、O,C项错误;乙醇与乙酸生成乙酸乙酯和乙酸乙酯的水解均为取代反应,D项正确。

阅读理解

阅读理解。

     How often one hears children wishing they were grown-ups and, old people wishing they were young

again. Each age has its pleasures and its pains, and the happiest person is the one who enjoys what each age

gives him without wasting his time in useless regrets.

     Childhood is a time when there are few responsibilities to make life difficult. If a child has good parents,

he is fed, looked after and loved, whatever he may do. It is impossible that he will ever again in his life be

given so much without having to do anything in return. What's more, life is always giving new things to the

child-things that have lost their interest for older people because they are too well known. But a child has his

pains: he is not so free to do what he wishes to do; he is repeatedly being told not to do something, or being

punished for what he has wrongly done.

     When a young man starts to earn his own living, he can no longer expect others to pay for his food, his

clothes, and his room, but has to work if he wants to live comfortably. If he spends most of his time playing

about in the way that he used to as a child, he will go hungry. And if he breaks the laws of society as he used

to break the laws of his parents, he may go to prison. If, however, he works hard, keeps out of trouble and

has good health, he can have the great happiness of building up for himself his own position in society.

1. According to Paragraph 2, the writer thinks that _____.

A. life for a child is fairly easy

B. a child is always loved whatever he does

C. if much is given to a child, he must do something in return

D. only children are interested in life

2. According to the passage, after a child grows up, he _______.

A. will have little time playing

B. has to be successful in finding a job

C. can still ask for help in time of trouble

D. should be able to take care of himself

3. The underlined word "responsibilities" in the second paragraph means _______.

A. duties

B. jobs

C. suggestions

D. desires

4. The main idea of the passage is that _____.

A. life is not enjoyable since each age has some pains

B. young men can have the greatest happiness if they work hard

C. childhood is the most enjoyable time in one's life

D. one is the happiest if he can make good use of each age in his life

单项选择题