临床最常见的尿路结石是（）
A.尿酸盐结石
B.磷酸盐结石
C.草酸盐结石
D.胱氨酸结石
E.黄嘌呤结石
参考答案：C
《出境货物通关单》针对鲜活类货物的有效期为( )天。
A．60
B．21
C．35
D．14
—Excuse me, do you know ?
—It's over there in front of the park. [ ]
A. where is the post office
B. where the post office is
C. where the post office was
