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
We have had to raise our prices because of the increase in the cost of materials.
A．primitive
B．rough
C．original
D．raw
单项选择题
Our new teacher is much younger than his ______.
A．successor
B．predecessor
C．colleague
D．workmate
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