问题 选择题

X.Y两种元素形成含氧酸A和B,能说明酸A比酸B强的是

A.酸A中X的化合价比酸B中Y化合价高

B.酸A中X与酸B中Y在同一周期,且X在Y之后

C.酸A与酸B的铵盐溶液反应生成酸B

D.酸A具有强氧化性,酸B没有强氧化性

答案

答案:C

题目分析:A.错误;B.最高价含氧酸的酸性看非金属性,同周期非金属性增强,最高价含氧酸的酸性强,题中没说是最高价含氧酸,错误;C.强酸制弱酸原理,正确;D.酸性的强弱与氧化性没有直接的关

系,错误。

阅读理解

阅读理解。

     Many people like to watch TV. Watching TV is one of the most important(重要的) activities(活动)

of the day. TV brings the outside closer to people’s homes. Some people say the world is smaller than

before---because of TV.

    What’s going on in the other countries? How do people live in places far away? Is there a good sports

game somewhere(某个地方)? What’s the life like in the deepest(最深的) part of the sea?

     If you want to answer these and other kinds of questions, just turn on the TV. Turn it on and watch.

You can see a lot and learn a lot. Of course, people can also learn through(通过) reading or listening to

the radio. But with TV they can learn better and more easily. Why? Because they can hear and watch, too.

     TV helps to open our eyes. TV also helps to open our minds(思想).TV often gives us new ideas. We

learn newer and better ways of doing something.

1. Some people say the world is smaller than before because_______.

A. TV makes the earth smaller and smaller

B.all people like to watch TV

C.watching TV is one of the most important activities of the day

D.TV brings the outside world closer to people

2. We can _______ when we watch TV.

A. go to live in the other countries

B. answer TV many questions

C. get a lot of information(信息)

D. ask TV some questions

3. People learn better through TV than through radio because_______.

A.TV sets are bigger than radios

B. people can not only hear but also watch

C. without TV people can't open their eyes

D. it's easier to turn on TV than to turn on radio

4. The sentence "TV also helps to open our minds" means:

A. our minds can only be opened by TV.B.something is wrong with our minds.

C.it can help us to increase our knowledge(知识)D. TV is new to us.

5. This article(文章) tells us________.

A. it's good to watch TV

B. not to watch TV any more.

C. students shouldn't watch TV at any time.

D. to stop reading to watch TV.

单项选择题 案例分析题