单项选择题

Several international events in the early 1990s seem likely to______, or at least weaken, the trends that emerged in the 1980s.

A．retrieve
B．revolve
C．reverse
D．revive
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单项选择题
We did everything we possibly could to ensure the news report was______.
A．feasible
B．genuine
C．appropriate
D．authentic
单项选择题
After years of research, scientists have ______the virus that is responsible for the disease.
A．recognized
B．identified
C．guaranteed
D．notified
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