单项选择题

Mathematics () the study or science of numbers.

A．is
B．are
C．was
D．were

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单项选择题

During the ten thousand miles journey across the desert, several men dropped with ().

A．fatigue
B．concession
C．grease
D．wreck

单项选择题

Sit () you like.

A．however
B．wherever
C．but
D．but where

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