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 ______ from childhood to adulthood is always a critical time for everybody.
A．conversion
B．transition
C．turnover
D．formation
单项选择题
If the world is to remain peaceful, the utmost effort must be made by nations to limit local ______ .
A．collisions
B．combats
C．contradictions
D．conflicts
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