肾前性急性肾衰竭诱因包括（）
A.大量利尿
B.心力衰竭
C.大量失血
D.双侧输尿管结石
E.脱水
参考答案：A, B, C, E
My shoes______ red.[ ]
A. isn't
B. are
C. is
People in some countries waste water______ people in others don’t have enough to drink.
A．while
B．because
C．if
D．so
