单项选择题

The defense lawyer was questioning the old man who was one of the ______ of the murder committed last month.

A) observers
B) witnesses
C) audiences
D) viewers
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单项选择题
The technological advances made it possible for the middle classes to enjoy what had once been ______ only to the very rich.
A) manageable
B) measurable
C) acceptable
D) affordable
单项选择题
Doctors warned against chewing tobacco as a______ for smoking.
A) relief
B) revival
C) substitute
D) succession
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