单项选择题

______ is recognized as the longest river in Britain.

A．The Thames River
B．The Amazon River
C．The Severn River
D．The Rhine River
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单项选择题
The background of ______, a novel by Dickens, is set in the French Revolution.
A．Oliver Twist
B．A Tale of Two Cities
C．David Copperfield
D．Great Expectations
单项选择题
Many AIDS experts are not completely satisfied with results of the study because
A．only a limited number of chimpanzees are used for sampling the virus.
B．it is now extremely difficult to find chimpanzees that carry the virus.
C．the samples collected are from two different subspecies of chimpanzees.
D．it does not provide reliable evidence of the link between SIV and HIV-1.
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