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    阅读理解

    　　Trees are useful to man in three very important ways: they provide him with wood and other products, they give him shade and they help to prevent drought(干旱)and floods. Unfortunately, in many parts of the world, in his eagerness to draw quick benefit from the tree, man has cut down a large number of trees. Even where a government realizes the importance of plentiful supply of trees, it is difficult for it to persuade the villagers to see this. So unless the government has a great system(体系)of control, or can educate the people, the forests will slowly disappear.

    　　The results are mom serious: for where there are trees their roots break the soil up—allowing the rain to sink—and also hold the soil, thus preventing it being washed away easily. but where there are no trees, the soil becomes hard and poor.

    　　The rain falls on hard ground and flows away on the surface, causing floods, and carry with it the rich top-soil, in which crops grow so well. When all the top-soil is gone, nothing remains but worthless desert .

    1．The purpose that the writer wrote this article for is ________.

    [　　]

    A．to tell people that trees are very useful to man

    B．to warn people not to cut down trees any more

    C．to warn that man mustn't destroy forests any more

    D．to explain how trees help to prevent drought and floods

    2．In the writer's opinion, ________, or the forests slowly disappear.

    [　　]

    A．measures must be taken

    B．people shouldn't draw benefit from the tree

    C．government must realize the serious results

    D．unless trees never be cut down

    3．According to the article we know it is ________ to prevent the forests from slowly disappearing.

    [　　]

    A．necessary but impossible

    B．necessary but difficult

    C．impossible and unimportant

    D．difficult and impossible

    4．In the last two paragraphs the writer to make it clear that ________.

    [　　]

    A．where there are no trees, the soil becomes hard and poor

    B．where there are many trees, there are fewer floods

    C．where there are no trees, the land might become desert slowly

    D．where there are many trees, there are more floods

    答案：C;A;B;C
    解析：

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