单项选择题

Recent changes in climate may ______ that global warming is starting to have an effect.

A．exemplify
B．witness
C．signify
D．swear
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单项选择题
A ______ racial incident in the summer of 2003 was cause for great public and administrative concern.
A．turbulent
B．sensational
C．marvelous
D．sentimental
单项选择题
Many hunting and gathering people of the late 10th century have recently adopted some form of organized agriculture to ______ their wild food resources.
A．accumulate
B．implement
C．compensate
D．supplement
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