寒热错杂，正气虚弱的久泻久痢，宜选用（）
A.芍药汤
B.白头翁汤
C.乌梅丸
D.真人养脏汤
E.四神丸
参考答案：C
Many clothing manufacturers now substitute artificial silk _____ natural silk to cut down costs of production．
A．with
B．by
C．for
D．of
If I ________ you, I'd take the small apple.[ ]
A. am
B. were
C. was
