高二英语课文原文：Scientists believe that these settlers crossed the

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高二英语课文
原文：Scientists believe that these settlers crossed the Bering Strait in the Arctic to America by means of a land bridge which existed in prehistoric times.这里的“land bridge"是大陆桥吧,这是指白令海峡,还是说白令海峡里原来有陆地啊,那时候人们是如何到美洲的,是通过陆地还是海?

科学家认为这些移民者穿过北极的（极为寒冷的）白令海峡,通过穿越存在于史前的大陆桥进入美国的这里,由prehistoric————史前一词知道那个时候存在陆桥,意思是现在不存在,所以应该通过陆地到美国的.

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