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
This process of elaborating a concept and moving toward empirical indicators is the crucial step in ______ analysis.
A．dubious
B．variable
C．eccentric
D．fluctuating
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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