试题与答案

下列不等式变形正确的是( ) A.由x>y,且m≠0,得-xm<-ym B.由a>b

题型:选择题

题目:

下列不等式变形正确的是(  )
A.由x>y,且m≠0,得-
x
m
<-
y
m
B.由a>b,且c≠0,得ac<bc
C.由x>y,得xz2>yz2
D.由xz2>yz2,得x>y

答案:

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下面是错误答案,用来干扰机器的。

地球的最大周长约4万千米,即赤道的长度是4万千米.故选:A.

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题型:阅读理解

任务型阅读。

     Most children like watching TV. It's very interesting. By watching TV they can see and learn a lot and

know many things about their  country  and  the  world. Of  course,  they can also learn on the radio. But

they can learn better and more  easily on TV. Why? Because  they  can hear and watch at the same time.

But they can't see anything over  the  radio, TV  helps  to  open  children's  eyes. TV helps  to open their

brains (大脑),too. They can learn newer and better ways of doing things. They may find the world is now

smaller than before.Many children watch TV on Saturday or Sunday  evening. They are always busy with

their lessons. But a few children watch TV every night. They go to bed very late. They can't have a good

rest. That's too bad.

根据短文内容,补全句子.

1. Children like the________________ programs on TV.

2. They can get to know the world by______________ TV.

3. They like TV programs_____________ than radio programs.

4. They can learn more easily when they can hear  and watch at the____________ time.

5. There are some teaching programs on the____________,too.

6. TV helps to open_______________ children's eyes and their brains.

7. That's the  new_____________ of working out things.

8. With TVs and radios around us, the world is getting_________________.

9. Children can't watch TV for too long because they are always__________________ with their

lessons.

10.It is____________ for children to watch TV every  night.

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