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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热门试题

单项选择题

The author's attitude toward the future of solar energy is ______.

A．optimistic
B．pessimistic
C．uncertain
D．disappointed

单项选择题

Which of the following is NOT TRUE of solar energy

A．The technical problem of providing heat on cloudy days are not yet solved.
B．It costs much to have a solar energy system installed at home.
C．There are basically two types of solar energy.
D．Solar energy is clean, inexhaustible and free of risk.