单项选择题

The law of supply and demand will eventually take care of shortage or ______ of meat production.

A．requirement
B．lack
C．surplus
D．addition
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单项选择题
It is time you give up your ______ and assumption, and do some practical things now.
A．justification
B．manifestation
C．specification
D．illusion
单项选择题
The author of the article must be ______ with environmental problem here, and all the details given are correct.
A．informed
B．acquainted
C．enlightened
D．acknowledged
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