中药汤剂煎煮时，需包煎的饮片是（）。
A.人参
B.阿胶
C.钩藤
D.海金沙
E.鹿角霜
参考答案：D
一个长方形按3：1放大后，周长变为原来的3倍，面积变为原来的9倍．______．
—Did your classmate accept your invitation?
—No, he ____ refused.
A．as far as
B．as well as
C．as soon as
D．as good as
