单项选择题

The disease was kept under control owing to early diagnosis and treatment.

A．on virtue with
B．for virtue of
C．by virtue of
D．in virtue with
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单项选择题
By the treaty each country pledged itself to assist the other in case of war.
A．assured
B．applied
C．obliged
D．promised
单项选择题
Several international events in the early 1990s seem likely to go backwards, or at least weaken, the trends that emerged in the 1980s.
A．revolt
B．revolve
C．reverse
D．revive
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