如果△ABC的顶点坐标分别是A（4，6），B（-2，1），C（4，-1），则重心的坐标是（　　）

A．（2，1）

B．（2，2）

C．（1，2）

D．（2，4）

改错(14分)

1.This pair of jeans match your T-shirt.                                                                    ____________

2.I know what to do it.                                                                                                  ____________

3.Look! Eddie is lieing in bed.                                                                             ____________

4.There are some cotton, silk, wool and leather over there.                                     ____________

5.They like clothes in the 1990s.                                                                                ____________

6.Yesterday you went to the cinema. I hope you have a good time.               __         

7.This shop is open at seven o’clock a.m. and closes at eight p.m.                            ____________