关于天平砝码的取用方法，正确的是（）。

A.戴上手套用手取

B.拿纸条夹取

C.用镊子夹取

D.直接用手取

E.都可以

—_____ come and join us in the game?

—_____. But I must meet my aunt at the airport.[ ]

A. Why not to; I think so          

B. Why don't you; I'm very' fired

C. Why not; I hope so              

D. Why not you; I like it