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
The microscope can ______ the object 100 times in diameter.
A．magnify
B．increase
C．develop
D．multiply
单项选择题
Everyone has a legal ______ to provide the tax office with details of their earnings.
A．oath
B．obligation
C．optimum
D．orientation
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