泌尿男生殖系结核原发灶最多存在于（）
A.前列腺
B.睾丸和附睾
C.膀胱
D.输尿管
E.肾
参考答案：E
—Shall we go for a hiking this weekend?
—All right, it rains.
A．if
B．unless
C．when
D．until
