问题
选择题
The computer system ____ suddenly while he was searching for information on the Internet.
A．broke out
B．broke down
C．broke up
D．broke in
答案
答案：B
考查短语辨析。句意“电脑闹系统突然失灵了，当他上网找信息时。”A“爆发”；B“出毛病，瓦解，中止，彻底失败”；C“分解，解散”；D“打断，闯入”。故选B。