单项选择题

The helicopters of NATO peacekeeping force were spotted hovering over a steep mountainside but no wreckage was visible and________ was restricted.

A．accent
B．assess
C．access
D．acceptance
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单项选择题
The chairman was so delighted to see all of the members of the club had ________at the conference.
A．turned back
B．turned off
C．turned out
D．turned up
单项选择题
Some people try to________ from the strange behavior of animals that an earthquake will happen.
A．detect
B．explore
C．refer
D．infer
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