单项选择题

During a period of protracted illness, the sick can become infirm, ______ both the strength to work and many of the specific skills they once possessed.

A．regaining
B．denying
C．pursuing
D．losing
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单项选择题
Consider the universal cannibalism of the sea, all of whose creatures ______ one another.
A．hide from
B．ferret out
C．prey on
D．compete against
单项选择题
Some customs travel well. Often, however, behavior that is considered the epitome of at home is perceived as impossibily rude or, at the least, harmlessly bizarre abroad.
A．novelty
B．eccentricity
C．urbanity
D．tolerance
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