函数f(x)=x3-3x2+1是减函数的区间为[ ]
A.(2,+∞)
B.(-∞,2)
C.(-∞,0)
D.(0,2)
D
下列各项中能表示物体质量的是( )
A.两个西瓜
B.100克水
C.一张课桌
D.4本书
--Have you read _____book called “Harry Potter”?
--Yeah, and I want to read it _______second time.
A.a; the
B.the; the
C.a; a
D.the; a