单项选择题
Biologists have
ascertained
that specialized cells convert chemical energy into mechanical energy.
A．determined
B．argued
C．pretended
D．hypothesized
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单项选择题
He gradually ______ that her parents had been right and his decision had to be modified.
A．perceived
B．pioneered
C．plagued
D．transformed
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单项选择题
The place ______ me very much.
A．interested
B．disinterested
C．uninterested
D．interesting
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