抗生素中第一个应用于临床的是（）
A.青霉素
B.氯霉素
C.链霉素
D.多黏菌素B
E.霉素
参考答案：A
While、do-while语句是用于______基本结构。
A．顺序
B．选择
C．循环
D．转移
37．Today’s college is appropriate as a setting for a society,________ its members must acquire and manage knowledge from a wide variety of sources．
A．which
B．so that
C．where
D．of which
