--- I promise to go shopping with you if you help me with the housework.

--- ____ You are the last person to keep a promise.

A．That’s great!

B．How come?

C．I don’t agree.

D．Come off it!

目前，只有( )可以实现无纸化发行和交易。

A．实物债券

B．凭证式债券

C．记账式债券

D．中央政府债券