单项选择题

In previous times, when fresh meat was in short ______, pigeons were kept by many household as a source of food.

A．store
B．provision
C．reserve
D．supply
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单项选择题
The speaker didn't mention much, so we asked him to be more ______.
A．particular
B．specific
C．special
D．significant
单项选择题
Doctors are often caught in a ______ because they have to decide whether they should tell their patients the truth or not.
A．puzzle
B．perplexity
C．dilemma
D．bewilderment
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