单项选择题

Because of modem technology, some mountain areas are not isolated ______ the outside world.

A．with
B．from
C．away
D．off
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He is not ______ of our admiration.
A．worth
B．worthy
C．worthwhile
D．worst
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Jimmy Carter is one of the ______ American presidents.
A．lively
B．living
C．alive
D．live
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