单项选择题

Americans are highly______, and therefore may find it difficult to become deeply involved with others.

A．moving
B．mobile
C．movable
D．motional
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单项选择题
Violence is just one of the many problems______in city life.
A．abundant
B．inherent
C．substantial
D．coherent
单项选择题
A pervasive negative attitude of the engineers toward projects funded by his company is the cause of the delay of signing the contract.
A．perpetual
B．pernicious
C．preventive
D．prevalent
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