句型转换。

1. Tony's favourite subject is science. (对划线部分提问)

    _____ Tony's favourite subject?

2. We have chemistry on Monday, Wednesday and Friday. (对划线部分提问)

    _____ _____ you _____ chemistry?

3. They go to school at 7:00 in the morning. (对划线部分提问)

    _____ _____ they go to school in the morning?

4. Tony and I have lunch at school. (变为否定句) 

    Tony and I _____ _____ lunch at school.

5. On Sunday, I watch TV. I play computer. (用连词合并成一句)

    On Sunday, I watch TV _____ play computer.

用亚甲基蓝比色法测定空气中硫化氢时，加入混合显色液后放置30min，再加磷酸氢二钠溶液的作用是（）

A.排除空气中二氧化硫的干扰

B.排除空气中氧化性气体的干扰

C.排除空气中甲醛的干扰

D.排除空气中氮氧化物的干扰

E.排除三氯化铁的颜色干扰