单项选择题

The ability to store knowledge makes computers different from every other machine______ invented.

A．ever
B．thus
C．yet
D．as
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单项选择题
How much of your country’’s electrical supply is ______from water power
A．deduced
B．derived
C．detached
D．declined
单项选择题
The book gives a brief _______of the course of his research up till now.
A．outline
B．reference
C．frame
D．outlook
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