单项选择题

The discussion was so prolonged and exhausting that ______ the speakers stopped for refreshments.

A．at large
B．at intervals
C．at case
D．at random
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单项选择题
Language, culture, and personality may be considered （）of each other in thought, but they are inseparable in fact.

A．indistinctly
B．separately
C．irrelevantly
D．independently
单项选择题
Changing from solid to liquid, water takes in heat from all substances near it, and this ______ produces artificial cold surrounding it.
A．absorption
B．transition
C．consumption
D．interaction
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