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
The ______ among his sisters was that he ought to marry the girl as soon as possible to avoid a scandal.
A．consensus
B．compromise
C．reconciliation
D．contradiction
单项选择题
Some companies are limiting the risk by conducting online ______ only with established business partners who are given access to the company's private intranet.
A．stimulation
B．transactions
C．transitions
D．solutions
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