提取药材中的原生苷,除了采用沸水提取外,还可选用()。
A.热乙醇
B.氯仿
C.乙醚
D.冷水
E.酸水
参考答案:A
______ I failed in English a third time, I had no doubt about my gift for foreign languages.
A.By the time
B.Until
C.After
D.Unless