（湖南省怀化市2014年高三第二次模拟考试）21. For more information, please send an e-mail, ______ you can also include your advice to us.

A．when

B．where

C．which

D．that

具有平肝潜阳、重镇降逆、凉血止血功效的药物是（）

A.龙骨

B.磁石

C.代赭石

D.牡蛎

E.珍珠母