具有补气养阴，清热生津作用的药物是（）
A.玄参
B.苦参
C.丹参
D.太子参
E.西洋参
参考答案：E
It is the third time that she _____ the role of Juliet ever since she graduated from university.[ ]
A. has played
B. had played
C. is playing
D. played
抽出液塔回流温度高，会导致抽出液塔顶产品粗PX中C9A含量增加甚至超标。（）
