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?

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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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