What aspect of North America does the passage mainly discuss? The passage supports which of the following statements?

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问题 What aspect of North America does the passage mainly discuss?
The passage supports which of the following statements?

选项 A、Arid America is not necessarily characterized by the presence of deserts
B、Most of Canada and the northeastern United States consists of short-grass prairies wherever natural vegetation has not been modified by humans
C、The accumulation of loess is primarily the result of irrigation
D、Glaciation removed the fertile layer of soil from much of the Mississippi Valley

答案A

解析
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