属于货币市场的金融工具有（）
A、股票
B、债券
C、商业票据
D、回购协议
E、国库券
参考答案：C, D, E
男生人数比女生多20%，女生人数比男生少______%
—Maths is as interesting as English, I think.
—_____. English is more interesting than maths. [ ]
A. I think so
B. I don't think so
C. I hope so
D. I don't hope so
