A． providing a panoramic view of the sea and an easier way to cross i
B． Only a small window zone of the sea as little as 2.5 miles wide could be crosse
C． The descending supplied a temporary opportunity to cross the sea easil
D． The sea was as narrow as a window so that people could cross it without effor
参考答案C
解析:【C】
【定位】题干给出定位在第5段。
【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，这就为人类轻易穿过海峡提供了一个“短暂的时机”。所以正确答案为C。
【定位】题干给出定位在第5段。
【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，这就为人类轻易穿过海峡提供了一个“短暂的时机”。所以正确答案为C。
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