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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单项选择题
One of his eyes was injured in an accident, but after a ______ operation, he quickly recovered his sight.
A．delicate
B．considerate
C．precise
D．sensitive
单项选择题
In general, matters which lie entirely within state borders are the ______ concern of state governments.
A．extinct
B．excluding
C．excessive
D．exclusive
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