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实现绿色化学的途径

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谈谈你是怎样理解化学是一把双刃剑的

我国动物种类最多的是以下哪种（）

A. 哺乳动物
B. 鸟类
C. 爬行类
D. 鱼类

物种多样性是指地球上（）等生物种类的丰富程度。

A. 植物
B. 动物
C. 微生物
D. 空气

This section is to test your ability to understand short dialogues. There are 7 recorder dialogues in it. After each dialogue, there is a recorded question. Both the dialogues and questions will be spoken two times. When you hear a question,you should decide on the correct answer from the 4 choices marked A),B),C),and D) given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.

A movie ticket.
B. A meeting room.
C. A fight.
D. A table.