根据所给汉语，完成下列各句。

1. _____ _____ _____ _____ _____ (当我们的老师进来的时候), the students were singing.

2. I was in the bedroom _____ _____ _____ _____ _____ _____ (他来看我时).

3. Sally was standing in front of the library _____ _____ _____  (天下雨时).

4. _____ _____ _____ _____ _____ _____  (凯蒂步行去学校的时候), she saw a car in the tree.

5. _____ _____ _____ _____ _____ _____ (我爸爸正在看报) at 8:00 yesterday evening.

6. I was deep in thought _____ _____ _____ _____ (这时电话铃响了).

下列属于红外线作用的是（）

A．杀菌作用

B．光敏性皮炎

C．红斑作用

D．日射病