Early in April this year some experts in...

Early in April this year some experts indicated that H1N1 would _____ this autumn.

A.break down B.break out C.break up D.break off

B 【解析】考查动词短语辨析。句意：今年四月初，一些专家暗示，H1N1会在秋天爆发。A. break down出故障、分解；B. break out爆发；突然发生；C. break up解散、瓦解；D. break off中断、断交。根据句意可知，空白处表疾病爆发，故选B。

考点分析：

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