A.Scientists have never been very successful in predicting the hurricanes.B.The hurric

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A.Scientists have never been very successful in predicting the hurricanes.

B.The hurricane season changes every year.

C.Hurricanes are always too changeable to be followed.

D.Some people ignore hurricane warnings and do not move to safety.

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热搜:a是b的充分条件,b是a的必要条件吗