药材金银花的抗菌成分是（）
A.木犀草素
B.芦丁
C.肌醇
D.绿原酸
E.山奈素
参考答案：D
We have two rooms __________ , but I can't decide ________.[ ]
A. to live；to choose which one
B. lived；choose which one
C. to live in；which one to choose
D. live；which one
对拉工作面常见的通风方式是（）。
A.W
D.U
C.H
D.Y
