单项选择题

If you think education is expensive, wait till you see what ______ costs you.

A．ignorance
B．knowledge
C．expenditure
D．school
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单项选择题
When confronted with these math problems, her mind tended to go ______ and could hardly work any more.
A．blank
B．faint
C．dim
D．vain
单项选择题
The present ______ of supplies will be alleviated when new shipments arrive.
A．limit
B．scarcity
C．confinement
D．restriction
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