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【参考答案】

therefore—however
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单项选择题
Which of the following is NOT mentioned as a high-risk group in danger of contracting AIDS
A．People engaged in the business of entertainment.
B．Homosexual and bisexual men.
C．Intravenous drug users.
D．Poor urban residents.
单项选择题
This passage is concerned with ______.
A．the revival of some North American and European CBDs
B．the problems facing the development of U. S. downtown areas
C．the moving pattern of the U.S. middle class
D．the possible solutions to the fiscal problems
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