单项选择题

AIDS is a global problem that demands a unified, worldwide solution, which is not only the responsibility of nations in which AIDS is most ______.

A．vigorous
B．relevant
C．prevalent
D．rigorous
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单项选择题
This kind of songbird sleeps much less during its annual ______, but that doesn’t seem to affect its flying.
A．emigration
B．migration
C．conveyance
D．transference
单项选择题
When the Italian poet Dante was ______ from his home in Florence, he decided to walk from Italy to Paris to search for the real meaning of life.
A．exiled
B．expired
C．exempted
D．exerted
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