Tony has a new bike.It is different from .
A:my
B:mine
C:myself
D:me
如图,⊙O的半径为3,点P是弦AB延长线上的一点,连接OP,若OP=4,∠P=30°,求弦AB的长.
人体所需的热量,来自脂肪比来自葡萄糖的( )