阅读理解。

     I have a good friend at home. Her name is Mimi. She is white and yellow. She is very cute. I play

with her when(当……的时候) I have time. She likes fish very much. When she is behind (在……之后)

the sofa or in her box, you can’t see her. When I sit on the sofa, she sits with me. In the evening I do my

homework at my desk, and she is on the desk. At that time I put her down(放下). Then she sits next to

me. Is she a good friend of mine?

1. Who is my good friend at home?

A. A boy.

B. A cat.

C. A fish.

D. A tiger.

2. When she is in the box or behind the sofa, you ______.

A. can’t see her

B. like her

C. play with her

D. don’t like her

3. When I do my homework, she ______.

A. does its homework

B. plays with a ball

C. sits on the sofa

D. sits on the desk

4. We can see ______ in the room.

A. a sofa

B. a black cat

C. some good friends

D. a computer

5. I do my homework ______.

A. in the morning

B. in the afternoon

C. in the evening

D. at noon

电机车轮对轮箍（车轮）踏而磨损余厚不小于原厚度的（）。

A、30%

B、50%

C、60%