单项选择题

The industrial community should be close enough to the crowded centers but distant enough to reduce ______ hazards.

A．feasible
B．positive
C．potential
D．substantial
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单项选择题
That matter is so ______ that it must not be discussed outside his office.
A．confidential
B．confident
C．private
D．mysterious
单项选择题
The ______ estimate of gains in gross national product suggested a fast recovery from economic recession.
A．introductory
B．possible
C．primary
D．preliminary
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