【单选题】Not long ago, most homeowners saw their roofs as simply something to keep the rain out. Now they see them as a source of electricity.Despite the bad economy, or maybe because of it, the rooftop-solar industry is booming, asAmericans become increasingly intrigued(引起兴趣) by the idea of turning their roofs into mini power plants and cutting their electric bills. In 2008,33,500 rooftop solar systems were installed in the United States, a 63 percent increase over the amount of capacity installed in 2007. InCalifornia, the solar capital of country, the increase was 95 percent.
The paragraph centers on the fact that
A、roofs used to be seen as a kind of protection from rain.
B、economy in the US is bad at present time.
C、roofs can be used as a source of electricity.
D、the rooftop-solar industry is developing fast in the US.
网考网参考答案:D
网考网解析:
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