小红周六早上要坐63道口算起，如果她每分钟做9道，需要（ ）分钟．
A．5
B．6
C．7
D．8
63÷9=7（分钟）．
故选：C．
--- Mum, I got good marks in the final exams.
--- .
A．It’s very nice of you.
B．Good luck
C．Congratulations!
D．I’m sorry to hear that.
试论述中央银行的业务原则。
