单项选择题

Miss Brown is the ________president, though her title is secretary.

A．sole
B．ultimate
C．virtual
D．comparative
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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
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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