标题: 大全-14-11 [打印本页]
作者: luckytu 时间: 2008-12-17 08:39 标题: 大全-14-11
11.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 caterpillars, kill them by stopping them from 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?
(A) Most species of caterpillar are subject to some natural predation.
(B) Many agricultural pests do not go through a caterpillar stage.
(C) Many agriculturally beneficial insects go through a caterpillar stage.
(D) Since caterpillars of different species emerge at different times, several sprayings would be necessary.
(E) Although the enzyme has been synthesized in the laboratory, no large-scale production facilities exist as yet.
请问B和C有什么区别？
作者: zouweiyao 时间: 2008-12-17 20:54
B说的是pest对农业有害，beneficial insects指的是那些益虫，如果它们在这
一过程中也别杀死了，那么这一手段显然不够好，所以是NOT ADVISABLE
作者: qiuqiaomm 时间: 2008-12-18 07:07
其实这道题只要能读懂题目，应该是比较简单的。
不过说实话，我在第一遍读的时候遇到了很多的生词，没有理解清楚的。
C才是正确答案了。
作者: sinadragon 时间: 2008-12-18 19:29
有疑问
我觉得B也是削弱
B说害虫不经过毛虫期（自己瞎翻译的），但是文中说这种enzyme对毛虫有效，B说
害虫不经过毛虫期，那就是说enzyme没用了，那么B不是断桥削弱么?
请大虾解答
谢谢
辛苦
作者: EagerBeaver 时间: 2008-12-19 07:16
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?
题目只指针对through caterpillar stage 的pest.
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