单项选择题

At present about 10% of American citizens possess a microcomputer.

A． Right
B． Wrong
C． Not mentioned
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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
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
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