单项选择题

The value of our house soared, enabling us to ______ to a larger place.

A．trade down
B．trade on
C．trade in
D．trade up
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单项选择题
Merry is a woman of ______ who has never abandoned her principles for the sake of winning a vote.
A．honesty
B．reputation
C．integrity
D．notoriety
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．intrusion
C．intervention
D．interaction
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