【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(jìn)森林里?——為了保護(hù)生態(tài)環(huán)境�？疾橐蓡�(wèn)詞辨析。why為什么，問(wèn)原因；which哪一個(gè)，問(wèn)事物；how怎樣，問(wèn)方式；when什么時(shí)候，問(wèn)時(shí)間。根據(jù)回答To protect the ecosystem.（為了保護(hù)生態(tài)環(huán)境，答句的不定式表目的或原因）可知問(wèn)的是原因，故選A。

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