Treesareusefultomaninthreeimportantways:theygivehimwood...

問題詳情：

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.

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

help him to make money          give him cool

give him wood and other things    help him to stop drought and floods

39. In many places forests slowly disappear because ________ .

trees have been cut down by man     trees are not well looked after

has not paid enough attention to planting trees        the above

40. 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.

41. Which title best fits the passage?

s and Man                 Function of Tree Wood

do People do with Trees?   Usage of Tree Roots

【回答】

DDDA

知識點：閱讀理解

題型：閱讀理解