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【題目】 do you put a lot of snakes into the forest?

—To protect the ecosystem.

A. WhyB. WhichC. HowD. When

【答案】A

【解析】

句意:——你為什么把很多蛇放進森林里?——為了保護生態(tài)環(huán)境?疾橐蓡栐~辨析。why為什么,問原因;which哪一個,問事物;how怎樣,問方式;when什么時候,問時間。根據回答To protect the ecosystem.(為了保護生態(tài)環(huán)境,答句的不定式表目的或原因)可知問的是原因,故選A。

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