从投资的角度看，资金时间价值的大小取决于( )。
A．投资利润率
B．投资额大小
C．风险因素
D．投资计算期
E．通货膨胀率
参考答案：A,C,D
— Mum, would you please buy me an MP5 player?
— If you can help do some housework the whole vacation，you _______ have one as a reward.
A．should
B．need
C．would
D．shall
