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
The last place（）in the factory was the tool room.

A．we visited
B．where we visited
C．that visited we
D．we visit
单项选择题
The Declaration of Independence,（）the constitution of the United States, was drawn up with the help of Benjamin Franklin.

A．as well as
B．also
C．and
D．so too
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