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
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单项选择题
This terrible accident happened ______ the cold evening of Oct. 5, 1989.
A．in
B．to
C．at
D．on
单项选择题
______ in a poor family, she is used to a simple life.
A．Born and breeding
B．Having born and bred
C．Born and bred
D．Being born and bred
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