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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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