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标题: OG12 CR 第115题 [打印本页]

作者: summerwaker 时间: 2012-5-4 07:00 标题: OG12 CR 第115题

Caterpillars of all species produce an identical hormone called “juvenile hormone” that maintains feeding behavior. Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone. This enzyme can be synthesized and will, on being ingested by immature caterpillar, kill them by stopping them for feeding.

Which of the following, if true, most strongly supports the view that it would NOT be advisable to try to eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme mentioned above?

(B) Many agricultural pests do not go through a caterpillar stage
(C) Many agricultural beneficial insects go through a caterpillar stage

我选了B，答案选C，我理解为什么选C可以，但为什么B不能选呢？这道题目在讨论杀害虫的问题，B不是更直接么？

作者: huanzitou 时间: 2012-5-4 21:57

请问一下这题的 (E) Although the enzyme has been synthesized in the laboratory, no large-scale production facilities exist as yet. 为什么不可以的。。OG 的解释是现在不能生产不代表以后。。有点模糊。。。。求解释~~

作者: oovictoroo 时间: 2012-5-5 09:23

E的选项不是针对问题的情况讲的吧。。

作者: xiaomakunkun 时间: 2012-5-6 08:31

According to OG:
E is wrong because：The mere lack of current production facilities does not mean that it would be inadvisable to
develop and use the spray in the future.
However in my opinion, I think E is not the right answer, because it contradict the premise
stimulus: cause enzyme can kill all the pests that go though a caterpillars stage,
conclusion: enzyme should be used to eradicate pests
potential assumption: there are enough synthesized enzyme
For E: there is no enzyme ---> So it is wrong

But I am not sure whether there are some flaws in my reasoning,
If so, please corret me``thanks a lot!

作者: lzlsnake 时间: 2012-5-6 21:37

仍然不太明白为什么B选项不对。楼主明白了或者其他明白的能不能讲解一下？
谢谢！

作者: lzlsnake 时间: 2012-5-7 06:32

继续问问看有没有人能解答一下为什么B选项不对呢？谢谢！

作者: james2201 时间: 2012-5-8 06:27

继续问问看有没有人能解答一下为什么B选项不对呢？谢谢！
lzlsnake 发表于 2012-5-7 06:32

问题所问是（主要看粗体）根除什么样的pest呢，是go through a caterpillar stage的pest。。。
Which of the following, if true, most strongly supports the view that it would NOT be advisable to try to eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme mentioned above?

(B) Many agricultural pests do not go through a caterpillar stage－－－很多pests没有go through a caterpillar stage－－－跟问的就没关系。都没有go through a caterpillar stage，这种enzyme就对根除这种pests没用了。
(C) Many agricultural beneficial insects go through a caterpillar stage－－－有益的insects也go through a caterpillar stage了，这种不能根除啊。

作者: liuqiaoqi77 时间: 2012-5-8 21:52

LS 正解问题问的是pest that go through a caterpillar stage

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