He was once turned down by a primary school for lack of ________ practical teaching experience. But now he has turned out to be one of ________ best teachers in the city.

A．a; a

B．/; the

C．the; the

D．a; the

血尿伴肾绞痛最常见的疾病是（）。

A.肾小球肾炎

B.肾结核

C.膀胱结石

D.输尿管结石

E.多囊肾