阅读理解。

     This is Jim's room. It's a nice room. There are some pictures on the wall (墙). There is a desk and a chair

in his room. There is a sofa and a bookcase, too. The desk is between (在……之间) the bed and the bookcase. His schoolbag and pencil case are on the desk. There are some pen-cils, a pen and a ruler in the pencil case.

Jim's sofa is near the desk. His baseball is under the bed.

1. There is _____ in his room.

A. a desk and a chair

B. a desk and some chairs

C. a chair and some desks

2. The desk is between the _____ and the _____.

A. sofa; bookcase

B. bed; bookcase

C. bed; sofa

3. Jim's pencil case is _____.

A. on the desk

B. next to the desk

C. under the bed

4. Jim's bed is near the _____.

A. sofa

B. plants

C. desk

5. Jim's _____ is under the bed.

A. pen

B. baseball

C. ruler

在放大电路中，用于产生（）偏流的电路，叫做偏值电路。

A.集电极

B.基极

C.发射极

D.三极