单项选择题

Ireland's total primary energy requirements ten years ago amounted to 8 billion tons of oil equivalent, ______ 38% was produced from indigenous sources.

A．which
B．of which
C．part of which
D．out of which
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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
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
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