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
An increasing proportion of our population, unable to live without advanced medical______, will become progressively more reliant on expensive technology.
A．interference
B．interruption
C．intervention
D．interaction
单项选择题
Tom's mother tried hard to persuade him to______. from his intention to invest his savings in stock market.
A．pull out
B．give up
C．draw in
D．back down
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