马兜铃蜜炙的主要目的是（）
A.降低其毒性
B.矫正苦劣之味，避免呕吐
C.免其苦寒导致腹痛
D.避免苦燥伤阴
E.避免戟人咽喉
参考答案：B
【5】 是从二维表列的方向进行的运算。
--Could you tell me ________?
---Yes. They ________ to the museum.
A．where the girls are; have gone
B．where were the girls; have been
C．where are the girls; have gone
D．where the girls were; have been
