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
Some people are sitting on the grass; others are strolling along the lake side,______.
A. chatting and to laugh

B. to chat and to laugh
C. chatting and laughing

D. chatting and laughed
单项选择题
Even if they are on sale, these refrigerators are equal in price to, if not more expensive than, ______ at the other store.
A. any other
B. the others
C. the ones
D. that
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