单项选择题

Almost all economists agree that nations gain by trading with .one another.

A．work
B．profit
C．rely
D．prove
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单项选择题
During his lifetime he was able to accumulate quite a fortune.
A．control
B．spend
C．collect
D．exchange
单项选择题
We consume a lot more than we are able to produce.
A．waste
B．buy
C．use
D．sell
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