单项选择题

The reporter refused to name the ______ of his information.

A．basis
B．origin
C．root
D．source
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单项选择题
Many people like the color white as it is a ______ of purity.
A．symbol
B．sign
C．signal
D．symptom
单项选择题
Occasionally I read a passage or sentence over and over just to let the beauty of its construction ______ in.
A．soak
B．fall
C．suck
D．stick
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