醒时经常汗出，活动尤甚，称为（）
A.大汗
B.自汗
C.盗汗
D.战汗
E.绝汗
参考答案：B
防止大气污染最有效的是 [ ]
A．植树造林
B．减少工业生产
C．禁止使用燃煤
D．农作物不再使用农药
As nobody here knows what is wrong with the machine, we must send for an engineer to______the
problem. [ ]
A. handle
B. raise
C. face
D. present
