单项选择题

A good night's sleep is a ______of having good recall in the weeks ahead, scientists have found.

A．appeal
B．call
C．request
D．prerequisite
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单项选择题
I became conscious of the ______between play and sport when I helped organize a sandlot football team at the age of 12.
A．difference
B．reference
C．interference
D．conference
单项选择题
The ______of a sales tax is that it decreases government reliance on income taxes.
A．outcome
B．supply
C．merit
D．balance
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