中间图

Or
banner
icon
OG18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。
阅读RC-14301 (第3/6题) Time Cost00:00
收藏
该题平均耗时:2m16s,平均正确率:40.1%

建议使用官方纸质指南,查看对照完整题目

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-P446-572题】

It can be inferred from the passage that the author believes which of the following to be true of the amphibian extinctions that have recently been reported?

  • 分析A选项
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • 分析B选项
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • 分析C选项
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • 分析D选项
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • 分析E选项
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
该题目由网友DPPWnz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 11:06:22 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:作者对 amphibian extinctions 
考作者态度,选项带入,排除法
A They have resulted primarily from human activities causing environmental degradation.
原文相反:n endangered population is always rare, almost always small, and, by definition, under constant threat of extinction even without a proximate cause in human activities.
B They could probably have been prevented if timely action had been taken to protect the habitats of amphibian species.
原文无涉及protect the habitats of amphibian species
C They should not come as a surprise, because amphibian populations generally have been declining for a number of years. 无涉及because之后内容
D They have probably been caused by a combination of chance events.
提到chance events,但是无涉及a combination of chance events
E They do not clearly constitute evidence of general environmental degradation.

题目讨论 5条评论)

用户头像
提交
  • 用户头像

    159144t

    选E,还是因为第一段最后一句:which, in their view, is an indicator of general and catastrophic environmental degradation due to human activity。 作者的态度是反驳第一段的。
    0 0 回复 2019-08-17 22:52:13
  • 用户头像

    Chongdi

    D提到chance events,但是无涉及a combination of chance events,我的天这也行?
    0 0 回复 2018-09-07 16:28:30
    • 评论用户头像

      peterbearpan回复Chongdi

      确实是这样,但如果E是一个特别明显的错误选项,我觉得这个也不是不可以选。不过和E比较后发现,E确实更准确。

      0 0 回复 2019-04-02 12:01:41

    • 评论用户头像

      囡囡回复Chongdi

      其实如果理解了第二段后面的话是很好排除的,d的话属于范围扩大,文章只说了chance event是其中一个可以引发的现象,但是并不是唯一也不一定绝对是引发的条件,后面还提到了别的可能。所以他说作者说是很多个chance event引发是错误的

      0 0 回复 2019-07-28 20:30:10

    • 评论用户头像

      Joyce L回复Chongdi

      probably是几乎肯定的意思,但是文中chance events只是一种可能,并不是“几乎肯定”

      0 0 回复 2019-07-29 11:51:06

  • 用户头像

    SeanDing

    看第三段最后一句。 Anecdotal reports of population decreases cannot distinguish among these possibilities, and some amphibian populations have shown strong fluctuations in the past.
    
    就是说现在还不知道是什么原因
    0 0 回复 2018-08-06 19:56:49
    • 评论用户头像

      crystal yu回复SeanDing

      这句话是说decrease,题目中是extinction,所以你的解释不对哦

      0 0 回复 2018-10-14 23:41:44

    • 评论用户头像

      Yang1116回复 crystal yu

      我也是认为看这句话比较能够说明白,因为在report中 decrease和extinction是等价的,所以才用后面篇幅说需要区分是如何下降的。这句话恰好说了报道里的下降不能够区分,因为过去出现了很大的波动——They do not clearly constitute evidence of general environmental degradation.

      0 0 回复 2018-10-21 03:08:14

  • 用户头像

    小X

    为什么不能因为最后一句postponing environmental action while we wait for it may doom species and whole ecosystems to extinction.而选B呢
    0 0 回复 2017-11-08 17:43:00
    • 评论用户头像

      Better vivi回复小X

      B选项我觉得是和E对比出来不够好的选项。但是有时候老头子们出题是会出B项这个思路的推断题。 为什么不够好呢。 最后一段第一句话: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. 这个是很清楚明白地反驳了开头中提到过的学者的观点,也就是E的意思。 而B选项,是推断出来的,也是一个逻辑问题。文中说的是。。如果不及时处理环境问题,可能会导致。。。但是并不一定表示这么做了,会有效。。

      0 0 回复 2018-02-01 16:26:02

    • 评论用户头像

      Yunaaa回复小X

      和habitat无关吧

      0 0 回复 2019-03-23 16:40:33

    • 评论用户头像

      210回复小X

      原文没有提到habitat

      0 0 回复 2019-09-25 15:22:55

  • 用户头像

    Gmatlulu

    作者的态度就是:目前没有能决定是哪种的方法
    0 0 回复 2017-11-05 20:28:22
    • 手机注册
    • 邮箱注册
    登录>







    关闭图标

    标题图

    • 图标

      知识库学习

      GMAT语法、逻辑、阅读、数学各单项备考知识点学习及测验
    • 图标

      在线做题

      包含GMAT各单项必考知识点题目、OG/PREP/GWD/雷哥讲义题目、难度650/680/700/730题库题目练习及题目解析
    • 图标

      在线模考

      语文套题/数学套题/全套仿真模考,包含GWD/PERP/精选模考等上百套套题模考
    • 图标

      在线测评

      适合5种不同基础的GMAT学员,测评后可自动出具分数报告及复习计划指导
    • 图标

      资料下载

      GMAT必备备考资料下载、鸡精下载、课程课件等免费下载
    • 图标

      课程学习

      注册会员后,可在GMAT课程区,选择免费直播课程及公开课程进行在线学习
    ×
    请你选择你要查看的模考成绩单
    立即开通 暂不开通
    加载图片
    网络异常