单项选择题

He presented a ________ of his model design to the Committee members for their approval.

A．sketch
B．model
C．sample
D．schedule
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单项选择题
The foreigner found it impossible for him to ________ more exactly or precisely what he wanted, and if he did we might help him.
A．purify
B．specify
C．regard
D．label
单项选择题
Professor Wang said that was a very good ________ you'd just put forward.
A．advice
B．description
C．suggestion
D．information
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