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
After years of research, scientists have ______ the virus that is responsible for the disease.
A．recognized
B．identified
C．guaranteed
D．notified
单项选择题
We can ______ over the ways and means before the construction work starts.
A．reckon
B．speculate
C．ponder
D．presume
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