单项选择题

The author agrees with the ALA that ______.

A．present smog standards should be made stricter
B．the standard established by the EPA is effective
C．some areas fail to meet the federal standard at times
D．poor air quality is a major problem nationwide

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单项选择题

What has happened to DOE's solar Village on the National Mall

A．It has revealed a mechanical problem.
B．It lacks the energy for operation.
C．It needs substantial financial support.
D．It has drawn criticism from the government.

单项选择题

It can be inferred that in promoting solar energy the US government ______.

A．admits its limitation of being expensive
B．rarely mentions its cost to homeowners
C．stands on the side of the majority of consumers
D．remains more objective than the solar equipment manufacturers