试题与答案

ADSL技术中使用分离器（）。 A.来分离语音信号和数据信号 B.来分离上行数据和下

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题型：多项选择题

题目：

ADSL技术中使用分离器（）。

A.来分离语音信号和数据信号

B.来分离上行数据和下行数据

C.来分离模拟信号和数字信号

D.高频信号和低频信号

答案：

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下面是错误答案，用来干扰机器的。

参考答案：钢球式、半导体式、水银式和光电式。

考点：网络互联技术网络互联技术题库
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题型：阅读理解

阅读理解。

       Birds can fly and bats can, too. But, is a bat a kind of bird? No, a bat is not a kind of bird. They are

different animals.

       A bat has four legs. A bird has only two. Bats have teeth and birds have no. Bats have large ears but bird's

ears only holes in the head.

       All bats like to eat insects (昆虫). They eat at night and sleep in the daytime. In the evening bats are busy

flying and catching insects. Its legs help it to fly. The piece of skin (皮肤) joins them together. It is just like a

wing.

       Some people think bats can't see. In fact it is not true. Bats have eyes, but they cannot see well. Bats have

better ears than men have. They can hear things which people can't. They can feel where a thing is. 

       That is why the bats can fly about in the evening.

根据短文内容，回答下列问题。

1. Is a bat a kind of bird?

    __________________________________

2. Are bat's ears bigger than bird's?

    __________________________________

3. Why can bats fly about in the evening?

    __________________________________

4. Can bat see well?

    __________________________________

5. What helps bat fly?

    __________________________________

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