Trees-are-useful-to-man-in-three-important-ways.pdf

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1、Trees are useful to man in three important ways:they give him wood and otheruseful things，they give him cool places,and they help to stop drought(干旱）andflood.Unluckily,in many parts of the world，man has not found that the third of thesepoints is the most important.Man wants to make money from trees，

2、so he has cutthem down in large numbers，only to find that without them he has lost the bestfriends 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 evenworse:for where t

3、here are trees,their roots（根）break up soil-make the rain inandalso bind（固定)the soil，thus stopping it from being washed away easily;but wherethere are no trees，the rain falls on hard ground and flows away，causing floods andcarrying away the rich topsoil。When all the topsoil is gone，nothing is left bu

4、tuseless desert。1。The most important points of trees to man is that _。A。they help him to make moneyB.they give him coolC。they give him wood and other thingsD.they help him to stop drought and floods2。In many places forests slowly disappear because _.A。many trees have been cut down by manB。new trees

5、are not well looked afterC.man has not paid enough attention to planting treesD。all the above3。Land becomes desert（荒地)after all trees are cut down because _。A.roots of trees break up the soilB。there are too many rainfallsC.strong winds bring a lot of sandD。there are no longer trees to keep the rain and protect the top-soil.4。Which title best fits the passage?A.Trees and ManB。The Function of Tree WoodC。How do People do with Trees?D.The Usage of Tree Roots5.Whats the main idea of this passage？A.B。C.D。1-5DDDA