—Father makes me take much exercise every day.

—OK. _______exercise you do, ______ you are.

A．The harder; the better

B．The higher; the great

C．The more; the healthier

D．The sooner; the happier

美元等同于黄金，实行可调整的固定汇率制度，是（）的特征。

A.布雷顿森林体系

B.牙买加体系

C.国际金本位

D.国际金块金汇兑本位制