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  3. PASSAGE THREE Actually, what is the key to the opportunity of people to move out of Africa?

PASSAGE THREE Actually, what is the key to the opportunity of people to move out of Africa?

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问题 PASSAGE THREE
Actually, what is the key to the opportunity of people to move out of Africa?
选项
答案Environment．
解析 第2段首句提到“在以前，我们都认为是文化发展给人们带来了离开非洲的机会”，但在段末又提到，“现在看来，环境因素才是关键”(it was the environment that was the key to this)，其中的this就是指代段首的the opportunity of people to move out of Africa，故可知本题答案为Environment。
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