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
His illness made him ______ of concentration.
A．incompetent
B．unable
C．incapable
D．powerless
单项选择题
After a concert tour in Asia, Canada and the U.S. , he will ______ work on a five-language opera.
A．confine
B．indulge
C．resume
D．undergo
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