— He’s never stolen anything before，______ he?

—______ ．It’s his third time to be taken to the police station．

A．hasn’t：Yes

B．is；Yes

C．has；Yes

D．has；No

NPV和基准贴现率iC关系为（）。

A.NPV随i_c的减小而减小

B.NPV随i_c的增大而增大

C.NPV随i_c的增大而减小

D.NPV与i_c的变化无关