泄泻致病的重要因素为（）
A.脾虚
B.肾虚
C.湿盛
D.肝郁
E.痰浊
参考答案：A, C
—Where______my keys?
—Sorry,______. [ ]
A. is; I don't know
B. are; I don't know
C. are; it's here
D. is; it's here
下列各组代数式中，不是同类项的一组是 [ ]
A．2x2y和﹣yx2
B．﹣32和3
C．x2y和xy2
D．3xy和﹣xy
