单项选择题

______. the temperature falling so rapidly, we could n' t go on with the experiment.

A．With
B．For
C．As
D．Since
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单项选择题
The toy maker produces a ______ copy of the space station, exact in every detail.
A．minimal
B．minimum
C．miniature
D．minor
单项选择题
The professor could hardly find sufficient grounds ______ his arguments in favor of the new theory.
A．to be based on
B．to base on
C．which to base on
D．on which to base
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