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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If you intend to have the fun of playing the game, you have to follow the ______ of rules.
A．group
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The present ______ of supplies will be alleviated when new shipments arrive.
A．limit
B．scarcity
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