单项选择题

In some cases managers have to learn how to write programs so as to work out computerized information systems that suit their own companies best.

A． Right
B． Wrong
C． Not mentioned
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单项选择题
It is useless to argue with him once he has made up his mind.
A．settled
B．solved
C．said
D．decided
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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