双侧膈肌抬高，较少见于（）
A.过度肥胖
B.妊娠
C.大量腹水
D.双侧膈下脓肿
E.肝脏肿瘤
参考答案：E
先化简，再求值：
2（x2y+xy）-3（x2y-xy）-4x2y，其中x=1，y=-1．
The shop assistant was fired as she was ___________ with cheating customers.
A．accused
B．charged
C．blamed
D．caught
