【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。考查疑問詞辨析。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(jù)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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