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

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

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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【S1】______
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【S2】______
until very recently, have the foolish idea that the treasures were "limitless"
and "inexhaustible". Most of the citizens of early generations knew little or 【S3】______
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 【S4】______
will sooner or later be harmful to all others. 【S5】______
    Fifty years ago nature study was not part of the school work. Scientific 【S6】______
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 【S7】______
in relation with proper land use; even the word conservation had nothing of the 【S8】______
meaning that it has for us today.
    For the sake of ourselves and those who come after us, we must now set about 【S9】______
repairing the mistakes of our forefathers. Conservation should, however, be made 【S10】______
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.   
【S10】
选项
答案however—therefore
解析 篇章错误。should表明这一句是针对上一行说的要着手改正先人所提出的错误的建议，因此这两句应该是因果关系，而非转折关系。
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