点P(m+3,m+1)在x轴上,则点P坐标为( )
A:(0,-2)
B:(2,0)
C:(4,0)
D:(0,-4)
All the athletes _______ the nice service during the London Olympics.
阅读下列材料,从每题所给的A、B、C、D四个选项中选出最佳选项·