单项选择题
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A.It has broken down before.
B.She generally doesn’t allow people to borrow it.
C.She is trying to sell it.
D.She bought it from a friend.
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填空题
Among the theories to explain the origin of AIDS, the polio vaccine theory, in the opinion of the author of the article, seems to be the most plausible one.
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单项选择题
A.One.B.Two.C.Three.D.Four.
A.One.
B.Two.
C.Three.
D.Four.
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