PASSAGE THREE What does the phrase "offering a ’brief window of time’ for humans to easily cross the sea" (5th paragraph) mean?

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问题 PASSAGE THREE
What does the phrase "offering a ’brief window of time’ for humans to easily cross the sea" (5th paragraph) mean?

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答案Supplying a temporary opportunity to cross the sea easily.

解析 根据第5段第1句话可知,由于红海南部的水平面下降,而且海面不宽,这为人类轻易穿过海峡提供了机会,而红海南部水平面曾经降低的那段时间只是漫长的人类史上的一个短暂时期(brief window of time),所以本题答案为Supplying a temporary opportunity to cross the sea easily。
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