按要求改写下列各句，每空一词。

1. I went to Hefei yesterday. (改为一般疑问句) 

   ______ you ______ to Hefei yesterday?

2. The weather was very bad. (改为否定句)

    The weather ______ ______ very bad.

3. The girls had a good time on the school trip. (改为同义句)

    The girls ______ ______ on the school trip.

4. The science teacher cleaned the bus yesterday afternoon. (对画线部分提问) 

    ______ ______ the science teacher ______ yesterday afternoon?

5. Tina got Jack Dean's autograph. (对画线部分提问) 

   ______ autograph ______ Tina ______?

船用雷达的天线是收发共用的，控制这转换的装置是（）

A、收发开关

B、波导管.

C、定时器

D、方位同步接收机