单项选择题

We regret to inform you that the materials you ordered are______.

A．out of work
B．out of stock
C．out of reach
D．out of practice
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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
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
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