单项选择题

During a civil defense exercise, the police ______ the streets in ease anyone tried to leave shelter too soon.

A．paved
B．patrolled
C．peered
D．permeate
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单项选择题
Bill is an example of a severely disabled person who has become ______ at many survival skills.
A．proficient
B．persistent
C．consistent
D．sufficient
单项选择题
In American universities, classes are often arranged in more flexible ______ and many jobs on campus are reserved for students.
A．scales
B．patterns
C．grades
D．ranks
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