单项选择题

The doctor wrote me a ________ for medicine for my cough.

A．perfection
B．partition
C．petition
D．prescription
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单项选择题
The year 1939 ________ the conquest of Poland by Germany.
A．withdrew
B．witnessed
C．wrecked
D．worshiped
单项选择题
Our research has focused on a drug which is so ________ as to be able to change brain chemistry.
A．powerful
B．influential
C．monstrous
D．vigorous
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