单项选择题

The book ______ too much on the economic aspects of the problem.

A．hesitates
B．lingers
C．retains
D．dwells
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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
单项选择题
Young horses may develop a ______ cough before and during exercise, particularly when cold air is breathed in during warming-up exercise or under dusty conditions.
A．perpetual
B．permanent
C．chronic
D．sustained
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