病人突然昏迷、抽搐、瞳孔缩小、皮肤湿冷、多汗、呼吸困难，呼出气有大蒜气味。应首先考虑的诊断是（）

A.CO中毒

B.巴比妥类药物中毒

C.吗啡中毒

D.阿托品中毒

E.有机磷农药中毒

The computer system _____suddenly while he was surfing the Internet.

A．broke up

B．broke out

C．broke in

D．broke down