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GWD-18-Q13

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发表于 2010-6-21 12:10:26 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
13. GWD-18-Q13

Eurasian watermilfoil, a weed not native to Frida Lake
, has reproduced prolifically since being accidentally introduced there.In order to eliminate the weed, biologists proposed treating infested parts of the lake with a certain herbicide that is nontoxic for humans and aquatic animals.However, the herbicide might damage populations of certain rare plant species that the lake contains.For this reason local officials rejected the proposal.


Which of the following, if true, points out the most serious weakness in the officials’ grounds for rejecting the biologists’ proposal?



A.The continuing spread of Eurasian watermilfoil in Frida Lake
threatens to choke out the lake’s rare plant species.
B.Because of ecological conditions prevailing in its native habitat, Eurasian watermilfoilis not as dominant there as it is in Frida Lake
.
C.The proliferation of Eurasian watermilfoil in Frida Lake
has led to reductions in the populations of some species of aquatic animals.
D.Although Eurasian watermilfoil could be mechanically removed from Frida Lake
, eliminating the weed would take far longer this way than it would using herbicides.
E.Unless Eurasian watermilfoil is completely eliminated from Frida Lake
, it will quickly spread again once herbicide treatments or other control measures cease.

A

B为什么不行呢?
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沙发
发表于 2010-7-30 14:49:49 | 只看该作者
原文说用了除草剂不仅杀死W植物,还会杀死某种稀有植物。

A说如果不用除草剂,W植物疯狂泛滥也会把氧气耗尽,从而搞死该稀有植物
板凳
发表于 2010-7-30 17:06:26 | 只看该作者
B属于无关选项。我个人认为weakness的题目就是要根据原文提出的问题,结合原文挑刺儿。GWD的题目有的答案比较怪异,不过这题我昨天做的时候还是很快得出答案的。呵呵
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