A.It does not think B.It always stays calm C.It is a better recycler D. It never makes mistakes

4.What does "reduce "mean ?

A.We must reduce the amount of food we eat. B.We must smoke less.

　　C.We must throw away less rubbish D.We must control the world's population

5.To protect an ecosystem, the best way is to ______.

A.develop industrie quickly. B.turn lakes into fields

　　C.kill the wild animals which feed on the plants D.leave things as they are

II Language points :

1.keep .....from doing sth 阻止做某事

stop/prevent .......from doing sth 与keep ...from doing sth 同义，但是前者在主动语态中可以省略from , 后者不可省，但是在被动语态中都不可以省略。

2．as 在句中是从属连词，"按照....，像....那样"引导方式状语

　　e.g. You ought to do as I tell you.

　　　　When at Rome, do as the Romans do.

3.live a better life相关词组

　　lead a happy life making a living earn one's living come to life all one's life

4. way 做先行词，定语从句可以有三种表示方法

　　e.g.I don't like the way that he laughed at home.

　　 I don't like the way in which he laughed at home.

　　 I don't like the way he laughed at home.

　5.act 的含义

　 e.g.You will see how they will act.

　 I can't act this way.

　 He just wanted to see her act.

　 What forces seem to be acting in this experiment.

　 He acted as chairman in my absence.

　 He tried to act out a story that he had read.

　 It's a play in five acts.

　 The natural Gas Policy Act was passed.

6.measure