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
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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
单项选择题
All ________knowledge originates in direct experience.
A．generous
B．genuine
C．genius
D．gentle
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