—I don't think students should be allowed to do homework with friends.

—I _____ you, although they often talk each other instead of studying. [ ]

A. agree with

B. disagree to

C. agree to

D. disagree with

某国未清偿外债余额为1200亿美元，国民生产总值为8000亿美元，货物服务出口总额为1600亿美元，当年外债还本付息总额为400亿美元，则该国外债偿债率为( )。

A．5%
B．33.33%
C．25%
D．15%