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The word "conservation" has a thrifty meaning.To conserve is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment.Our forefathers had no idea that human population would increase faster than the supplies of raw materials: most of them, even until very recently, had the foolish idea that the treasures were "limitless" and could "last forever". Most of the citizens of earlier generations knew little or nothing about the complicated and delicate system that runs all through nature, and which means that, as in a living body, an unhealthy condition of one part will sooner or later be hamrful to all the others.

Fifty years ago, nature study was not part of the school work; scientific forestry was a new idea; wood was still cheap because it could be brought in any quantity from distant woodlands; soil destruction and river floods were not national problems; nobody had yet studied long-term climatic cycles in relation to proper land use; even the word "conservation" had nothing of the meaning that it has for us today. For the sake of ourselves and those who will come after us, we must now set about correcting the mistakes of our forefathers.Conservation should be made a part of everybody's daily life.To know about the water table in the ground is just as important to us as a knowledge of the basic math formulas.We need to know why all watersheds(上游集水区) need the protection of plant life and why the running current of streams and rivers must be made to yield their full benefit to the soil before they finally escape to the sea.We need to be taught the duty of planting trees as well as of cutting them.We need to know the importance of big, grown trees, because living space for most of man’s fellow creatures on this planet is figured not only in square measure of surface but also in cubic(立方体的)volume above the earth. In a word, it should be our goal to restore as much of the original beauty of nature as we can.

69.The author's attitude towards the use of natural resources is _____.

    A.positive     B.uninterested   C.optimistic    D.critical

70.According to the author,, the greatest mistake of our forefathers was mat    .

    A.they had no idea about scientific forestry

    B.they had little or no sense of environmental protection

    C.they were not aware of the importance of nature study

    D.they had no idea of how to make good use of raw materials

71.To avoid repeating the mistakes of our forefathers, the author suggests that _____.

    A.we plant more trees

    B.natural sciences be taught to everybody

    C.environmental education be directed toward everyone

    D.we return to nature

72.How can you understand the underlined sentence in the last paragraph?

    A.Our living space on the earth is getting smaller and smaller.

    B.Our living space should be measured in cubic volume.

    C.We need to take some measures to protect space.

    D.We must preserve good living conditions for both birds and animals.

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阅读下列短文,从每题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。
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B
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When the Japanese bump heads, they immediately bump heads again. According to a Japanese superstition, the first-bump means their parents will die, but the second bump "erases" the first bump         
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C.showing us the magic power of number
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