单项选择题

The officials called for an immediate ______ to determine the cause of the accident.

A．investigation
B．preparation
C．recognition
D．observation
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单项选择题
The sounds of the music grew ______ in the distance. It became still just for a while.
A．false
B．vacant
C．faint
D．blank
单项选择题
When you get to the motorway, what you should do is just to follow the to New York.
A．marks
B．signs
C．signals
D．indications
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