He wrote his first novel ______ studying in a university.

A．since

B．as

C．while

D．with

肾挫伤的主要临床表现（）。

A.大量肉眼血尿

B.显微镜下血尿或肉眼血尿

C.不易纠正的严重休克

D.腰部肿块和肉眼血尿

E.腰部肿块