【GMAT考满分阅读RC题库】More selective than most chemical pesticides in th_真题_答案

GWD - 阅读RC - 127

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题目材料

More selective than most chemical pesticides in that they ordinarily destroy only unwanted species, biocontrol agents (such as insects, fungi, and viruses) eat, infect, or parasitize targeted plant or animal pests. However, biocontrol agents can negatively affect nontarget species by, for example, competing with them for resources: a biocontrol agent might reduce the benefits conferred by a desirable animal species by consuming a plant on which the animal prefers to lay its eggs.

Another example of indirect negative consequences occurred in England when a virus introduced to control rabbits reduced the amount of open ground (because large rabbit populations reduce the ground cover), in turn reducing underground ant nests and triggering the extinction of a blue butterfly that had depended on the nests to shelter its offspring. The paucity of known extinctions or disruptions resulting from indirect interactions may reflect not the infrequency of such mishaps but rather the failure to look for or to detect them: most organisms likely to be adversely affected by indirect interactions are of little or no known commercial value and the events linking a biocontrol agent with an adverse effect are often unclear. Moreover, determining the potential risks of biocontrol agents before they are used is difficult, especially when a nonnative agent is introduced, because, unlike a chemical pesticide, a biocontrol agent may adapt in unpredictable ways, so that it can feed on or otherwise harm new hosts.

The passage is primarily concerned with

Aexplaining why until recently scientists failed to recognize the risks presented by biocontrol agents.
Bemphasizing that biocontrol agents and chemical pesticides have more similarties than differences.
Csuggesting that only certain biocontrol agents should be used to control plant or animal pasts.
Darguing that biocontrol agents involve risks, some of which may not be readily discerned.
Esuggesting that mishaps involving biocontroll agents are relatively commonplace.

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正确答案: D

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IELTS_killer

排除得太快，没有好好对比DE
E中commonplace（普遍的）错
D中discern察觉

2016-09-30 09:28:15 IP属地：局域网举报

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oliviawoo

这题做错我就傻了。。
怎么选了E呢。。are relatively commonplace.。。。没有体现啊

2014-11-14 12:58:56 IP属地：上海举报

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PeggyChiang

A ) explaining why until recently scientists failed to recognize the risks presented by biocontrol agents. （只是推測有些fail to recognize的原因，且此部分只包含最後1/3，不能成為主旨。）

D ) arguing that biocontrol agents involve risks, some of which may not be readily discerned.
（本題舉了兩個例子，占了1/2篇幅，應該重點在陳述biocontrol有風險。some of which may not be readily concerned改寫 “The paucity of known…are often unclear.”）

2014-10-02 00:38:56 IP属地：中国台湾举报

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Octavian

这是一片典型的”结论---论证解释“类的文章。行文思路：作者抛出自己的观点，然后辅以具体的例子来解释论证之。读完第一段，就能做出第一题。否则便是对文章结构和思想把握的不到位。这篇文章的主题句是：However, biocontrol agents can negatively affect nontarget species 。

2015-02-28 10:12:05 IP属地：局域网举报

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MartinTao

这篇并不算难，第二段第一句的『in turn』各位注意一下第二个意思。
【in turn】
in succession; one after the other:
everyone took it in turn to attack my work.
▪ (also in one's/its turn)
❗️used to convey that an action, process, or situation is the result of a previous one:
he would shout until she, in her turn, lost her temper.

2019-09-02 22:57:16 IP属地：北京举报

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MartinTao 回复 MartinTao

长难句：The paucity of known extinctions or disruptions resulting from indirect interactions may reflect 『not 』the infrequency of such mishaps 『but rather』 the failure to look for or to detect them. 我楼下那哥们理解错了。注意句中的not ... but (rather)结构，本句的意思是：对间接作用造成的灭绝或扰乱的知之甚少并非意味着这种不幸之事（即，extinctions or disruptions）很少发生，而是意味着对他们（即，extinctions or disruptions）的寻找或者探查的失败。

2019-09-02 23:09:04 IP属地：北京举报

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yiwaki

文章的最后一句，Moreover, determining the potential risks of biocontrol agents before they are used is difficult, especially when a nonnative agent is introduced, BECAUSE, unlike a chemical pesticide, a biocontrol agent may adapt in unpredictable ways. so that it can feed on or otherwise harm new hosts.
because后面不是就解释了为何难以识别的原因么，为何不选A？

2013-07-12 14:37:30 IP属地：广东举报

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houruiqiGMAT

【金句】The paucity of known extinctions or disruptions resulting from indirect interactions may reflect not the infrequency of such mishaps but rather the failure to look for or to detect them: most organisms likely to be adversely affected by indirect interactions are of little or no known commercial value and the events linking a biocontrol agent with an adverse effect are often unclear.
paucity n

2014-07-16 13:18:29 IP属地：广东举报

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跪下叫脸脸

most organisms likely to be adversely affected by indirect interactions are of little or no known commercial value and the events linking a biocontrol agent with an adverse effect are often unclear.
请大神给翻译一下这句话and前半部分内容，不是很理解。

2018-01-16 20:31:37 IP属地：河南举报

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ITISOPHIE

原来arguing有“表明”的意思啊。。。

2020-07-22 19:00:14 IP属地：局域网举报

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stephytang

However, biocontrol agents can negatively affect nontarget species = biocontrol agents involve risks
Moreover, determining the potential risks of biocontrol agents before they are used is difficult = some of which may not be readily discerned.

2021-09-24 19:04:21 IP属地：局域网举报

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正确率： 89%

难度：

选择材料题号

GWD

GWD
PREP07 Test 1
PREP07 Test 2
PREP2012
OG16
OG17
PREP08 Test 1
PREP08 Test 2
Manhattan
Magoosh
OG18
OG18-数学分册
OG18-语文分册
OG19
OG19-语文分册
OG19-数学分册
OG20
OG20-语文分册
OG20-数学分册

SET 1

题目来源

题目来源1:GWD

题目来源2:PREP07 Test 2

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