根据下列句子的意思及所给的汉语提示，写出空缺处单词、固定短语或固定搭配的

正确形式。

1. People should be p______ from polluting the environment.

2. Could you write a ______ (describe) of your mother?

3. I think it is ______ (danger) for children to be close to wild animals.

4. Can you type and talk ______ (同时)?

5. Cathy was ill. So I went on business ______ (代替) her.

研究生课程分为学位课和（）两类

A.非学位课

B.公共基础课

C.以上都不对