OG10 逻辑134 请教下！

yinshengsss

134. 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.


这个题目答案是C， 我第一次选的D。貌似找不出什么很好的理由来排除D。
请教下会做这道题目的人，帮忙分析下。谢谢！！

haonan15110

C说采用这种方法的话将会把益虫杀掉，因此不采纳（很好）。D的意思是因为需要多喷洒几次而不采用这种方法（几乎无法support）

yinshengsss

哦谢谢LS！我没看到several这个词，它是带有否定的意思。明白了！

jasondream

原文讲了一堆关于毛虫分泌的一种荷尔蒙已经抑制这种荷尔蒙可以起到杀死它的作用等等，而最后的题目和答案和原文一点关系都没有啊，如果不看原文，我们也可以知道杀虫剂把益虫杀死了不好，所以不能太多使用杀虫剂啊！～
求救！！！已经进入这种无逻辑的思路里了，是不是我疯了？MY GOD！

lyzero

选项中的go through 是什么意思？总不能翻译成有益动物经历了毛毛虫时期吧！！！！！！