When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the worldA.broke offB.broke downC.broke outD.broke away
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C解析考查短语辨析。句意“当H1N1病毒最初在墨西哥暴发时，没有人会想到它会传播得这么快。”A“折断，突然停止；解除”；B“分解，坏掉”；C“暴发”；D“脱离，打破”。故选C。