为了维持生命活动，每人每天至少需要（）升水。
A.2
B.5
C.10
D.15
参考答案：A
A．电子从A转移到B，瞬时电流方向由A至B
B．电子从B转移到A，瞬时电流方向由A至B
C．电子从A转移到B，瞬时电流方向由B至A
D．电子从B转移到A，瞬时电流方向由B至A
The order came that the enemies ____ in two hours.
A．would be defeated
B．should defeat
C．should be defeated
D．must be defeated
