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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单项选择题
In the preface ________the book, the writer thanked all the people who had helped him.
A．of
B．for
C．in
D．to
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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