句型转换，每空一词。

1. My sister is not heavy or thin. (改为同义句)  

    My sister is _______ _______ ______．  

2. Mr Dean is short and he has long brown hair. (改为同义句)    

    Mr Dean is a ____   man ____   long brown hair.  

3. Be quiet and listen to me. (改为同义句)    

    _______ _______ and listen to me.  

4. Don't forget to get here at 7:30 this evening. (改为同义句)   

    _______ _______ get here at 7:30 this evening.  

5. I think she can write stories. (改为否定句)    

    I ____    think she _______ write stories.

（）可以抽取制冷系统里的气体并获得足够的真空度。

A、真空泵

B、制冷压缩机

C、空气压缩机

D、制冷设备