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
To speed up the ______ of letters, the Post Office introduced automatic sorting.
A．treatment
B．delivery
C．transmission
D．departure
单项选择题
Some people believe that since oil is scarce, the ______ of the motor industry is uncertain.
A．terminal
B．benefit
C．fate
D．estimate
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