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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单项选择题
Dr. Johnson ______ the task of writing a comprehensive English dictionary.
A．underwent
B．undertook
C．recreated
D．awarded
单项选择题
______ market research has shown that most Americans prefer environmentally-friendly products.
A．Nasty
B．Neat
C．Preliminary
D．Prior
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