单项选择题

In most cases, you have to use the chemicals within ______.

A．limits
B．borders
C．ranges
D．care
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单项选择题
The child began to cry when the nurse pricked a needle at the ______ of its finger.
A．end
B．tip
C．edge
D．point
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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