问题 单项选择题

天花是通过下列哪一种疫苗的应用而被消灭的()

A.天花病毒疫苗

B.灭活疫苗

C.痘苗病毒疫苗

D.减毒活疫苗

E.传代细胞疫苗

答案

参考答案:C

解析:天花疫苗是人类使用时间最长、人数最多的疫苗,也是最成功的疫苗,人类用其于1979年在地球上消灭了天花。我国的天花疫苗——天坛株痘苗病毒是世界卫生组织向国际上推荐的4个主要天花疫苗之一。

阅读理解

阅读理解。

    Young people can have problems with their minds. Some student becomes worried because they have to

study very hard. Others have trouble getting on well with people like their parents and classmates.

     Liu Wei, a junior 2 student from Hefei, could not understand his teacher and was doing badly in his lessons.

He became so worried about it that he started to cut his finger with a knife.

     Another student, 14-year-old Yang Fang from Guangzhou, was afraid of exams. She got very worried in

one, and when she looked at the exam paper, she couldn't think of anything to write.

     A recent report from Jiefang Daily says about 18% of Shanghai teenagers have mental problems. Their

troubles include being worried and very unhappy, and having problems in learning and getting on with people.

Many students who gave problems won't go for advice or help. Some think they will look stupid if they go to

see a doctor. Others don't want to talk about their secrets.

     Liang Yuezhu, an expert on teenagers from Beijing Anding Hospital has the following advice for teenagers:

    Talk to your parents or teachers often. 

    Take part in group activities and play sports. 

    Go to see a doctor if you feel unhappy or unwell.

1. The students who often become worried or have trouble getting on with others may have _____. [ ]

A. mental problems

B. a headache

C. knife with them

D. no parents

2. Liu Wei cut his finger with a knife because _____. [ ]

A. he was afraid of his teacher

B. he wanted to frighten his parents

C. he was so worried about his studies

D. his finger was badly hurt

3. Yang Fang's problem happened when _____. [ ]

A. she studied very hard

B. she had exams

C. she talked with her parents

D. she thought of something

4. Students who have problems won't ask others for help because _____. [ ]

A. they won't let others think they are stupid

B. they don't think doctors can help them

C. they think the problems are not serious

D. they have no secrets about others

5. Liang Yuezhu's advice tell us that _____. [ ]

A. it's unnecessary for them to be with others

B. only group activities and sports can help them

C. teachers and parents can't do anything about mental problems

D. it's better for the students who have mental problems to join others.

多项选择题