Question

When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the world.

A．broke off

B．broke down

C．broke out

D．broke away

Answer 1

C

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。