单项选择题

She ______ high levels of lead in her drinking water.

A．perceived
B．spotted
C．detected
D．discerned
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单项选择题
--Must I turn the paper in at the end of this week--No, you ______.
A．mustn't
B．needn't
C．don't
D．shouldn't
单项选择题
By turns I ______ and flush with heat, and Theodora is greatly disturbed about me.
A．shiver
B．quaver
C．tremble
D．quiver
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