维生素E的需要量以何者为活性单位。( )
A.视网醇
B.α-生育醇
C.胆钙化固醇
D.烟草酸
参考答案:B
We have been friends for nearly twenty years. Nothing can break off our _______.
A.friendship
B.pleasure
C.decision
D.experience
When we are in hospital, we can see "_____". [ ]
A. No Parking
B. No Photos
C. No Smoking
D. No Fishing