单项选择题

During the oil crisis of the 1970s, many states ______ speed limits to reduce gasoline use.

A．implanted
B．imposed
C．impaired
D．impressed
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单项选择题
Practitioners of law and medicine are esteemed in many countries which seems to indicate that ______ depends on profession or title.
A．prestige
B．superiority
C．privilege
D．merit
单项选择题
it is generally thought that as teachers work with students, psychology course work is ______ to teacher-training.
A．indispensable
B．inviolate
C．indisposed
D．invariable
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