单项选择题

Employers who establish retirement plans must be ______ about engaging in transactions with their plans.

A．indecisive
B．cautious
C．implicit
D．conscious
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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
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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