除去下列物质中的少量杂质，所选试剂或操作方法不正确的一组是（　　）

A．A

B．B

C．C

D．D

Not only _______interested in football but ______beginning to show an interest in it.

A．the teacher himself is; all his students are

B．the teacher himself is; are all his students

C．is the teacher himself ; are all his students

D．is the teacher himself; all his students are