溃疡病并发幽门梗阻患者其最佳的洗胃时间为（）
A.清晨
B.上午
C.下午
D.睡前
E.半夜
参考答案：A, D
All possible means ______. However, nothing can _____ his wife dying of lung cancer.[ ]
A. has tried; stop
B. have tried; keep
C. have been tried; prevent
D. has been tried; stop
“中山舰事件”发生在哪一年？
