按要求改写句子.

1. He is enjoying himself in the park. (改为同义句)

     He is __   __ __   __ __   __ __   __ in the park.

2. It's warm and humid in spring here. (就画线部分提问)

     __   __ __   __ the __   __ in spring here?

3. They are taking photos. (就画线部分提问)

     __   __ __   __ they __   __?

4. He likes to lie on the sofa. (改为同义句)

    He __   __ __   __ on the sofa.

5. I'm surprised they can play in this heat. (改为同义句)

    To my__   __, they can play in such __   __ weather.

可使婴儿牙齿黄染的药物是（）

A.溴隐亭

B.麦角胺

C.放射性碘

D.四环素类

E.溴化物