问题
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Before 1500 North America was inhabited by more than 300 cultural groups, each with differ
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The most distinguishable linguistic feature of a regional dialect is itsA.use of words.B.u
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Regional dialects are used most widely in a community.()
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The need of those starved people can be met unless the region has ample food resources.
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The northern and southern polar regions are different in many ways. The most important dif
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The rate of heat transfer from a hot region to a cold region is affected most by the _____