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OG20官方指南,建议同学们刷3遍。第一遍做题了解题型和考点,第二遍精刷,第三遍集中解决疑难问题。建议考生第一遍刷题采用官方正版纸质书籍,若遇到疑难问题,欢迎在此专区查阅解析,提供解析,参与题目讨论,与所有考生一起解决疑难问题。
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There are recent reports of apparently drastic declines in amphibian populations and of extinctions of a number of the world’s endangered amphibian species. These declines, if real, may be signs of a general trend toward extinction, and many environmentalists have claimed that immediate environmental action is necessary to remedy this “amphibian crisis,” which, in

their view, is an indicator of general and catastrophic environmental degradation due to human activity.

To evaluate these claims, it is useful to make a preliminary distinction that is far too often ignored. A declining population should not be confused with an endangered one. An endangered population is always rare, almost always small, and, by definition, under constant threat of extinction even without a proximate cause in human activities. Its disappearance, however unfortunate, should come as no great surprise. Moreover, chance events—which may indicate nothing about the direction of trends in population size—may lead to its extinction. The probability of extinction due to such random factors depends on the population size and is independent of the prevailing direction of change in that size.

For biologists, population declines are potentially more worrisome than extinctions. Persistent declines, especially in large populations, indicate a changed ecological context. Even here, distinctions must again be made among declines that are only apparent (in the sense that they are part of habitual cycles or of normal fluctuations), declines that take a population to some lower but still acceptable level, and those that threaten extinction (e.g., by taking the number of individuals below the minimum viable population). Anecdotal reports of population decreases cannot distinguish among these possibilities, and some amphibian populations have shown strong fluctuations in the past.

It is indisputably true that there is simply not enough long-term scientific data on amphibian populations to enable researchers to identify real declines in amphibian populations. Many fairly common amphibian species declared all but extinct after severe declines in the 1950s and 1960s have subsequently recovered, and so might the apparently declining populations that have generated the current appearance of an amphibian crisis. Unfortunately, longterm data will not soon be forthcoming, and postponing environmental action while we wait for it may doom species and whole ecosystems to extinction.

【OG20-P446-571题】

It can be inferred from the passage that the author believes which of the following to be true of the environmentalists mentioned in highlight lines ?

  • 分析A选项
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  • 分析B选项
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  • 分析C选项
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  • 分析D选项
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  • 分析E选项
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该题目由网友ztuwv提供。更多GMAT题目请
暂无雷哥网文字解析
当前版本由 感觉自己萌萌哒 更新于2015-11-03 11:06:42 感谢由 感觉自己萌萌哒 对此题目的解答所做出的贡献。
题干:关于第一段中出现的environmentalists,作者最有可能同意的
定位:第一段中,关于environmentalists有2点,如果数量的减少是灭绝的信号,那么1 环保措施很重要 2 这个现象时由人类活动引起的
作者对1的态度在第4段,对 2 的态度在第2段
A They have wrongly chosen to focus on anecdotal reports rather than on the long-term data that are currently available concerning amphibians.
原文相反:第四段开头,there is simply not enough long-term scientific data,是对第三段结尾 anecdotal reports的回应,支持观点。没有涉及到wrongly chosen to focus on anecdotal reports
B Their recommendations are flawed because their research focuses too narrowly on a single category of animal species.
无涉及too narrowly on a single category of animal species.
C Their certainty that population declines in general are caused by environmental degradation is not warranted.
无涉及,原文中作者对population declines没有提出质疑
D They have drawn premature conclusions concerning a crisis in amphibian populations from recent reports of declines.
对应第二段:A declining population should not be confused with an endangered one.
E They have overestimated the effects of chance events on trends in amphibian populations.
原文相反,文中是没有考虑,非overestimated

题目讨论 10条评论)

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  • 用户头像

    卿卿绿草mua~

    E错在哪里?最近报道amphibian populations 下降,这不就是个随机事件么?他们从这个事件中就得出A物种灭亡,这不就是overestimated, 高估这个事件的影响严重程度么?
    0 0 回复 2020-12-13 12:05:15
    • 评论用户头像

      Dora6688回复卿卿绿草mua~

      个人理解:chance events是后文提到的内容,这个地方的infer是针对第一段highlight的环境学家在第一段的观点上infer的,可先localize之后immediate 进行推理,highlight部分没有提到关于chance events的什么事情;后文的的chance event指的是导致灭绝的事件,不是灭绝这件事本身。

      0 0 回复 2020-12-30 16:22:26

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    jamsmo

    c错在强加因果 文章中degradation是结果而不是原因,human activity才是原因。
    1 0 回复 2020-11-18 00:20:39
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    1047789l

    premature是哪看出来的啊
    0 0 回复 2020-11-09 16:15:37
    • 评论用户头像

      jamsmo回复1047789l

      if real

      0 0 回复 2020-11-18 00:20:56

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    Jennie在学习

    
                                                
    0 0 回复 2020-09-09 08:05:57
    • 评论用户头像

      Jennie在学习回复Jennie在学习

      补一下,ED是由human activity造成的。“ED due to human activity”

      0 0 回复 2020-09-09 08:08:26

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    小火火火箭

    C错哪?
    0 0 回复 2019-10-14 17:06:58
    • 评论用户头像

      小火火火箭回复小火火火箭

      物种数量减少不是由于环境退化导致的,作者确实有这个观点啊

      0 0 回复 2019-10-14 17:07:37

    • 评论用户头像

      徐小小纯回复 小火火火箭

      作者质疑的是对于环境degradation是由于human activity造成的,并不是环境退化本身

      0 0 回复 2019-10-16 23:27:00

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    161866lz

    作者是质疑数据不够充分支持结论,不是结论错误
    0 0 回复 2019-09-01 19:18:47
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    Joyce L

    indicator 标志
    0 0 回复 2019-08-04 01:30:28
  • 用户头像

    Joyce L

    due to human activity,  not environmental degradation
    0 0 回复 2018-06-02 12:04:57
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    轩娅

    an indicator ≠ caused by
    0 0 回复 2017-12-22 20:57:15
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    pano

    原文说环境学家认为,种群数量下降暗示着人类活动造成环境退化,并没有说环境退化造成种群数量下降
    0 0 回复 2017-10-07 19:10:56
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