具有补肾助阳、润肠通便功效的药物是（）
A.山药
B.白术
C.当归
D.甘草
E.锁阳
参考答案：E
A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.
A．carrying out
B． carried out
C．working out
D．worked out
下列哪一项是衣原体的繁殖型( )
A．原体B．始体C．包涵体D．吞噬体E．溶原体
