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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
单项选择题
The author's attitude toward the future of solar energy is ______.
A．optimistic
B．pessimistic
C．uncertain
D．disappointed
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