试题与答案

A/D转换器与D/A转换器分别有哪些主要技术指标？分辨率和转换精度这两个技术指标有什

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题目：

A/D转换器与D/A转换器分别有哪些主要技术指标？分辨率和转换精度这两个技术指标有什么区别和联系。

答案：

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参考答案：A

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     There are many kinds of ants (蚂蚁) in America. One kind is very strong. People are afraid of it

 and animals are afraid of it, too. 

     These ants are often in big groups. They eat all the animals on their way. They can kill (杀死) and 

eat elephants. And they can eat houses. Sometimes they can kill (杀死) people and eat them. When

 the ants come near, people leave their homes. But people are sometimes happy after the ants pass by,

because they can see no insects (昆虫) or snakes.

1. Some ants in America can be very ____.

A. ugly            

B. strong

C. friendly

D. shy

2. People and animals are afraid of ____.

A. one kind of ants

B. all kinds of ants

C. small ants

D. big ants

3. People get away from the ants because ____.

A. the ants cannot eat and kill elephants

B. the ants cannot eat houses

C. the ants are not often in big groups

D. the ants can kill people

4. Where are the insects or the snake's after the ants pass by?

A. They are under the ground.

B. They go to other places before the ants come.

C. Ants kill and eat them.

D. People kill and eat them.

5. Which is the best title for the story?   

A. Ants              

B. American Ants   

C. Big Ants    

D. A Strong Ant
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