单项选择题

Professor Lin's dedication to teaching earned him the respect of both his colleagues and students.

A．experience in
B．determination of
C．devotion to
D．contributions to
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单项选择题
Since speech is such a familiar activity, it is often regarded as a universal endowment.
A．event
B．habit
C．trait
D．gift
单项选择题
If you put too many potatoes in that paper-bag it will burst.
A．crash
B．explode
C．crack
D．be broken
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