单项选择题

His speech gave us valuable ______ into the problems of education.

A．inquiry
B．investigation
C．input
D．insight
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单项选择题
Refreshments at the exhibition will be available on a ______ basis.
A．coin
B．cash
C．money
D．change
单项选择题
The town in the valley is ______ by a high mountain.
A．confronted
B．distributed
C．constituted
D．dominated
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