单项选择题

A programmed computer begins to show on its screen the figures you need（）

A．when switched on
B．switched on
C．to be switched on
D．being switched on

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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
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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