填空题

A strong El Nino is often associated with wet winters over the southern U.S., as well as drought in Indonesia, Philippines and Australia.

【参考答案】

N

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People can hardly ever observe a Rossby wave since it doesn’t occur on the surface and the process is very slow.

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The normal situation is warm water (about 30℃ ) in the east, cold (about 22℃) in the west.