生产过程中产生的静电电压的最高值能达到( )以上。

A．数十伏

B．数百伏

C．数千伏

D．数万伏

单句改错。

1. He is still afraid of fly in an airplane.

     A             B         C       D

 ( )        

2. Jill could play piano when she was a child.

             A             B      C           D

 (     )        

3.He use to play the chess.     

          A  B C     D               

 (     )        

4. Do you use to go to work on foot?

    A           B                 C        D

 ( )        

5. He went out with the room light in last night.

                 A    B                          C    D

 (     )