单项选择题

Having considered that problem, they ______ their conversation to other matter.

A．interrupted
B．resumed
C．avoided
D．switched
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单项选择题
Leaves are to a plant ______ lungs are to an animal.

A．so
B．like
C．as
D．what
单项选择题
I'd like to ______ this old car for a new model but I can't afford it.
A．rescue
B．exchange
C．replace
D．convert
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