需要烊化的中药是（）
A.蒲黄
B.当归
C.砂仁
D.鹿角霜
E.鹿角胶
参考答案：E
Yesterday it rained heavily when school was over. We ______ stay in our classroom. [ ]
A. should
B. must
C. had to
（）的收购方式又称换股。
A．用现金购买股票
B．用股票购买股票
C．用股票交换股票
D．用资产收购股份或资产
