单项选择题

The purpose of this passage is_______.

A．to talk about employment problems in the science classroom
B．to examine the appropriateness of the wide use of metaphor
C．to see if it is wise to summarize the parable of Nord's Net
D．to familiarize you with its wide application in discussions
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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
B．range
C．set
D．pack
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