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
What has the man decided to do
A．To buy a ticket now.
B．To buy a ticket at Perth.
C．To go to Perth first.
D．To talk to his friends.
单项选择题
John Williams likes to
A．live away from human society.
B．find a peaceful place to read books.
C．make things by himself.
D．have a chat with his friends in his cabin.
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