Trees are useful to man in three important ways: they give him wood and other useful things, they give him cool places, and they help to stop drought and flood.

Unluckily, in many parts of the world, man has not found that the third of these points is the most important. Man wants to make money from trees, so he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And also, he is usually too careless to plant and look after new trees. So the forests slowly disappear.

This does not only mean that man will have fewer trees. The results are even worse: for where there are trees, their roots break up soil-make the rain in-and also bind the soil, thus stopping it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing is left but useless desert.

1.The most important points of trees to man is ________.

A. they help him to make money

B. they give him cool

C. they give him wood and other things

D. they help him to stop drought and floods

2.In many places forests slowly disappear because ________ .

A. many trees have been cut down by man

B. new trees are not well looked after

C. man has not paid enough attention to planting trees

D. all the above

3.Land becomes desert after all trees are cut down because ________ .

A. roots of trees break up the soil

B. there are too many rainfalls

C. strong winds bring a lot of sand

D. there are no longer trees to keep the rain and protect the top-soil.

4. Which title best fits the passage?

A. Trees and Man.

B. The Function of Tree Wood.

C. How do People do with Trees?

D. The Usage of Tree Roots.

综合填空

根据短文和所给首字母写出所缺单词，使短文完整，意思通顺、连贯

Do you know something about tree rings (年轮)? Do you know they can tell us what the weather was l__1___, sometimes even hundreds of years ago?

A tree will grow well in a climate with lots of sunshine and rainfall. And l__2__ sunshine or rainfall will limit (限制) the growth of a tree. We can see the change of climate by studying the tree rings. For e___3___, to find out the weather of ten years ago, count the rings of a tree from o___4___ to the inside. If the t___5___ ring is far from the eleventh ring, then we are sure that it was sunny and rainy most of that year. If it is near to the eleventh ring, then the climate that year was bad.

Tree rings are i___6___ not only for studying the history of weather but also for studying the history of man. Long long ago there lived a lot of people at a place in New Mexico. But now you can find only s___7___ there—no trees and no people. What h____8___?

A scientist studied the rings of d___9__ trees there. He found that the people had to leave b__10___ they had cut down all trees to make fires and buildings. As all trees had gone, the people there had to move. 

There are some easy things you can do to protect(保护) the environment and the earth. Choose ideas from the list or come up with a few of your own.
● Plant flowers, grass or trees.
●Whenever you visit a park or beach, take away what you bring there----keep rubbish in a bag until you can put it in a dustbin (垃圾箱).
●Turn off the lights, TV sets when you leave the room. This saves (节约)a lot of electricity.
●Turn off the tap (水笼头)when you brush your teeth. You can save some water by not letting it run. Also, use a glass cup instead of a paper cup because this saves paper.
●Keep the doors and windows closed in winter to keep warm air in.
●Give your old books and magazines to a library instead of throwing them away.
●Give your old clothes to poor children you know instead of throwing them away.
●Use both sides of paper.
●Stop pouring (倒)dirty water into the rivers or the lakes nearby (附近).
●Encourage all your friends to do the same things you do to help protect the earth.
You don’t have to wait until Earth Day to do these things. Make every day Earth Day.
If everyone makes a contribution (贡献)to protecting the environment, the world will become much more beautiful.
【小题1】From the above, we know that this is ____________.

There are some easy things you can do to protect the environment and the earth. Choose ideas from the list or come up with a few of your own.

·Plant flowers, grass or trees.

·Whenever you visit a park or beach, take away what you bring there—keep rubbish in a bag until you can put it in a dustbin.

·Turn off the lights and TV sets when you leave the room. This can save a lot of electricity.

·Turn off the tap when you brush your teeth. You can save some water by not letting it run. Also, use a glass cup instead of a paper cup because this saves paper.

·Keep the doors and windows closed in winter to keep warm air in.

·Give your old books and magazines to a library instead of throwing them away.

·Give your old clothes to poor children you know instead of throwing them away.

·Use both sides of paper.

·Stop pouring dirty water into the rivers or lakes nearby.

·Encourage all your friends to do the same things you do to help protect the earth. You don’t have to wait until Earth Day to do these things. Make every day Earth Day. If everyone makes a contribution to protecting the environment, the world will become much more beautiful.

1.From the above, we know that this is           .

A. a sign                     B. a proposal (倡议书)       C. an ad(advertisement)

2.The writer tells us           .

A. that we can’t do all these things until Earth Day

B. to pour dirty water into the rivers

C. to save water by not letting it run while brushing our teeth

3. We can            to save paper.

A. use a paper cup            B. use both sides of paper       C. give new books to a library

4.Which of the following is wrong according to the writer?

A. Turn off the lights when you leave the room.

B. Close the doors and windows in winter.

C. Use a paper cup when you brush your teeth.

5. What’s the best title of the passage?

A. Protect the Earth                  B. Save Money      C. Make Better Use of Old Things