哪些药物应慎用于消化性溃疡患者（）。
A.利血平
B.甲硝唑
C.氢氯噻嗪
D.阿司匹林
E.保泰松
参考答案：A, D, E
用“＜”或“＞”填空：-5______0．
The computer system _____ suddenly while he was playing computer games.
A．broke down
B．broke out
C．broke up
D．broke in
