三、补全对话。

从方框中选择合适的选项补全对话。其中有两项多余。

A：Hi，Peter!Did you watch the World Service CCTV yesterday evening?

B：No，I didn't.21.________

A：Yes，there was.The African elephants are endangered.

B：Really?22.________

A：People killed a great number of elephants only for their tusks.

B：Was there anything about the manatees?How about them?

A：They are endangered，too.23.________

B：Why?

A：Because some of the swamps have become polluted.

B：24.________ We are supposed to try our best to protect these animals.

A：25.________ Animals are important to us.They are human's friends，you know.

A.What happened to them?

B.That's too bad!

C.Was there anything important?

D.I agree with you.

E.It's said that there are few left in the world.

F.It is important to keep the balance of nature.

G.Why don't they do something to protect them?

四、完形填空。(2013，广州)

It's very important that we all recycle (再利用).In nature，everything __26__again.For example，when an animal dies，it becomes __27__ animal's food.Nothing is wasted.But humans have created things like plastic bags __28__can't be broken down by nature.Our rubbish kills animals and __29__water and soil.__30__we continue making too much rubbish，the problem will only get worse.If nature can't reuse the rubbish，we must recycle __31__.We should clean up the rubbish we've made because nature can't.

Recycling is also the right thing to do for another reason.The earth is rich in natural materials like water and trees，__32__these materials are not endless.We use up our natural materials much __33__than the earth is able to reproduce them.For example，each year we cut __34__more than 6 000 square miles of forest.But it takes an average of 25 years for a new tree __

35__.

Recycling can help us save the earth，so let's take action right now.

26.A.use B.using C.is used D.used

27.A.another B.other C.others D.the other

28.A.who B.which C.how D.where

29.A.pollutes B.polluted C.polluting D.is polluted

30.A.When B.Whether C.Why D.If

31.A.them B.their C.it D.itself

32.A.but B.so C.and D.or

33.A.fastly B.fast C.faster D.fastest

34.A.out B.down C.in D.up

35.A.grows B.for growing

C.growing D.to grow