单项选择题

The research is designed to contribute to an improved foundation for teacher training and teacher ______.

A．appraisal
B．applause
C．approval
D．appreciation
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The ______ of schools, stores, hospitals, and so on is an important factor when purchasing a house.
A．publicity
B．proximity
C．purity
D．probability
单项选择题
A knowledge of classical music is ______ to anyone who wants to apply for this job.
A．invariable
B．indispensable
C．invaluable
D．innumerable
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