人民币的升值意味着  [ ]

A．100单位的外币可以兑换更多的人民币

B．外汇汇率的降低

C．外汇汇率的升高

D．有利于出口

This program can give you a lift at work, ____ increase your income by 50%.

A．as long as

B．as well as

C．so much as

D．as soon as