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  3. The word conservation has a thrifty meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such go

The word conservation has a thrifty meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such go

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问题     The word conservation has a thrifty meaning. To conserve is to save and
    protect, to leave what we ourselves enjoy in such good condition as others      【M1】______
    may also share the enjoyment. Our forefathers had no idea that human population
    would increase faster than the supplies of crude materials. Most of them, even  【M2】______
    until very recently, have the foolish idea that the treasures were "limitless"
    and "inexhaustible". Most of the citizens of early generations knew little or   【M3】______
    nothing about the complicated and the delicate system that runs all through the
    nature, which means that, as in a life body, an unhealthy condition of one part 【M4】______
    will sooner or later be harmful to all others.                                  【M5】______
    Fifty years ago nature study was not part of the school work. Scientific        【M6】______
    forestry was a new idea; timber was still cheap at that time because it could be
    brought in any quantity from distant woodlands; soil destruction and river floods
    were not national problems; nobody had already studied long-term climate cycles 【M7】______
    in relation with proper land use; even the word conservation had nothing of the 【M8】______
    meaning that it has for us today.
    For the sake of ourselves and those who come after us, we must now set about    【M9】______
    repairing the mistakes of our forefathers. Conservation should, however, be made【M10】______
    a part of everyone’s daily life. To know about the water table in the ground is
    just as important to us as a knowledge of the basic arithmetic formulas.
【M7】
选项
答案already→yet
解析 用词错误。already用在肯定句中，yet一般多用在否定句或含否定含义的句子中。从否定主语nobody可知，应改already为yet。
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