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．ranks
C．grades
D．patterns
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单项选择题
The goals ______ he had fought all his life no longer seemed important to him.
A．after which
B．for which
C．with which
D．for that
单项选择题
By the end of 2001, 559 kinds of products had been ______ green food.
A．named
B．restricted
C．classified
D．labeled
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