单项选择题

There is ______ district in the world.

A．no such a
B．not such
C．not such a
D．no such
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单项选择题
Great as Newton was, many of his ideas ______ today and are being modified by the work of scientists of our time.
A．are to challenge
B．may be challenged
C．have been challenged
D．are challenging
单项选择题
Classification is a useful ______ to the organization of knowledge in any field.
A．means
B．approach
C．mode
D．manner
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