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逻辑CR-17936 【难度:650-680】 Time Cost
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Biologist: Species with broad geographic ranges probably tend to endure longer than species with narrow ranges. The broader a species’ range, the more likely that species is to survive the extinction of populations in a few areas. Therefore, it is likely that the proportion of species with broad ranges tends to gradually increase with time.

The biologist’s conclusion follows logically from the above if which of the following is assumed?

  • 分析A选项 分析选校图标
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  • 分析B选项 分析选校图标
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  • 分析C选项 分析选校图标
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  • 分析D选项 分析选校图标
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  • 分析E选项 分析选校图标
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暂无雷哥网文字解析
当前版本由 441420ztyf 更新于2021-11-02 14:11:49 感谢由 441420ztyf 对此题目的解答所做出的贡献。
题目给了两个事实
1.生存范围越大,存活的越久
2.生存范围越大,生存的几率越大
结论,生存范围大的物种比例越来越多
这里两个事实都没有说比例的问题,需要一个假设,存活的越长,比例越高 = 范围大>存活久>比例高

题目讨论 (7条评论)

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    321800m

    这题c为什么不对啊
    0 0 回复 2022-10-25 19:51:02
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    194279xfone

    Assumption題型的搭橋:在結論中出現前提並未提及的新訊息即gradually increase這件事情,所以assumption必須把broad/endure longer跟increase這件事情連接起來,也就是d選項
    1 0 回复 2022-04-23 20:38:33
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    632530aeusq

    只有D选项可以确保比例变大,E和C选项都可以假设分子分母同时变小,那么比例就不一定会变大。
    0 0 回复 2021-08-26 15:03:09
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    Mariposa爱学习

    活动区域大--活得久;小范围灭绝但整体不会
    所以活动范围广的品种很可能比例越来越大
    涉及到一点数学思维:
    比例怎么变大?1.分母变大:活动范围广的数量变大 2.分子变小:活动范围小的数量变小
    D选项表达的就是分母变大

    0 5 回复 2020-11-13 15:56:46
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    Mariposa爱学习

    活动区域大--活得久
    小范围灭绝但整体不会
    所以活动范围广的品种很可能比例越来越大
    涉及到一点数学思维:
    比例怎么变大?1.活动范围广的数量变大 2.活动范围小的数量变小
    D选项表达的就是第一个方法
    0 2 回复 2020-11-13 15:55:22
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    285544bkqh

    gap题
    0 0 回复 2020-11-10 14:57:52
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    鸡鸡沙西米

    his question asks us to find an assumption that allows the biologist's conclusion to be logically drawn if made in conjunction with the premises of the biologist's argument.
    
    The biologist claims that species with broader ranges are more likely to survive the extinction of populations in certain areas than are species with narrow ranges. The biologist concludes that over time the proportion of species with broader ranges will probably increase.
    
    Note that the argument as it stands is not logically valid: it is possible that if species that now have broad ranges survive the extinction of populations with narrow ranges, the proportion of species with broad ranges could still decline. That is, decimation of populations in certain areas may in fact cause the ranges of species that now have broad ranges to shrink in size, thereby becoming narrow ranges.
    
    Were this to happen at a faster pace than the extinction of species that currently have narrow ranges, the proportion of species with broad ranges would decline rather than increase. The correct answer to this question must rule out this possibility.
    
    A. This choice does not rule out the possibility that the proportion of species that have broad ranges would decline.
    B. This choice does not rule out the possibility that the proportion of species that have broad ranges would decline.
    C. This choice does not rule out the possibility that the proportion of species that have broad ranges would decline. In fact, this assumption helps to support the claim that as certain populations of a species that once had a broad range die out, that species' range could narrow.
    D. Correct. This assumption rules out the possibility described above; furthermore, it rules out any other possibility that allows the biologist's conclusion to be false even if the premises were true.
    E. This choice does not rule out the possibility that the proportion of species that have broad ranges would decline.
    0 0 回复 2020-10-29 14:22:52
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