问题补充:
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:
A. broke out
(答案→)B. broke down
C. broke up
D. broke in
解析: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。