（）是和平共处五项基本原则的核心和主要原则。

A.互相尊重主权和领土完整

B.互不侵犯

C.互不干涉内政

D.平等互利，和平共处

Could you finish the task in two days? 一（）I have something else to do these days．

A.I could not

B.Yes．I think so

C.I'm afraid so

D.I'm afraid not