[句填] Before 1500 North America was ...
Before 1500 North America was inhabited by more than 300 cultural groups,
each with different customs, social structures, world views, and
languages;such diversity____the existence of a single Native American culture.
(D)argues against
(E)explains away
ans D why not E??
Biologists____isolated oceanic islands like the Galapagos, because, in such
small, laboratory-like settings, the rih huryly-burly of continental plant
and animal communities is reduced to a scientifically ____complexity.
Ans prize tractable 原因是?
tks ^^
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