断面淡红棕色或黄棕色，显颗粒性，髓部有星点的药材是（）
A.黄连
B.虎杖
C.何首乌
D.黄芩
E.大黄
参考答案：E
The pen my father sent me as my birthday gift very well.
A．is written
B．writes
C．writing
D．has written
肌酸激酶(CK)是由2个亚单位组成的二聚体，产生的同工酶有
A．2种B．3种C．4种D．5种E．6种
