OG(11th)117

[lovekyoko]

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.

我想問 for pupation to take place does要怎麼翻譯 does是代替哪個動詞嗎


還有 最後一句的 on being ingested by immature caterpillars是插入句嗎
我看不懂這結構

最後一句是說 這酵素可以被綜合同時將會殺掉them=immature caterpillars
還沒有成熟的幼蟲藉著停止未成熟的幼蟲繼續吃這個行為 這樣說對嗎
那中間那句 要怎麼跟這句連上

[rurulu]

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.

這句話應該是下面的倒裝句：

A special enzyme halt the production of juvenile hormone only when a caterpillar has grown to the right size for pupation to take place.

原文的意思應該是說：

毛毛蟲靠著juvenile hormone維持feeding的行為，而有一種特殊的enzyme會讓毛毛蟲停止生產juvenile hormone，這種enzyme只有在毛毛蟲長到特定的大小、要結蛹時才會分泌。

但是後面說：

其實這種enzyme是可以被合成的（有點像是說可以被人工作出來的感覺，因為原文說只有在他要結成蛹時才會有）。

因此問題問說，如果要把一種跟毛毛蟲有同樣生長經歷的害蟲除掉，爲什麼噴灑有enzyme的東西不是好主意？因為照原文來看，enzyme這東西應該可以使毛毛蟲stop feeding阿～所以答案選Ｃ，Ｃ說很多對農產品有益的蟲也都跟毛毛蟲有一樣的生長歷程，所以如果用enzyme殺了害蟲，也會殺了益蟲。


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