单项选择题

Three straight lines meeting at three points (constitute) a triangle.

A．center on
B．come down to
C．consist of
D．form
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单项选择题
A central objective of the developed country was to (alleviate) the problems of the urban poor.
A．lessen
B．identify
C．overcome
D．regulate
单项选择题
Mary had sold her bike, taken a driving (test) and bought a car.
A．examination
B．quiz
C．exercise
D．check
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