A gallon of gas may propel your car 25 miles. But the electricity you get from that gallon of gas won't get you nearly as far — so electric cars burn more fuel than gas­powered ones. If our electricity came mostly from nukes(核能发电厂), or geothermal, or hydro, or solar, or wind, then an electric car truly would be clean. But for political, technical, and economic reasons, we don't use much of those energy sources.

　　In addition, electric cars' batteries which are poisonous for a long time will eventually end up in a landfill. And finally, when cars are the polluters, the pollution is spread across all the roads. When it's a power plant, though, all the junk is in one place. Nature is very good at cleaning up when things are too concentrated, but it takes a lot longer when all the garbage is in one spot.

　　1. What does “clueless” mean in paragraph 2?

　　A. People are seeing the California Greens everywhere.

　　B. People in California love to talk about “zero­emissions vehicles”．

　　C. People in California love to have their roofs covered with solar cells.

　　D. People there have no idea that so far electricity mainly comes from burning coal, oil, etc.

　　2. What is the main idea of the passage?

　　A. Electric cars are not clean at all.

　　B. Electric cars are better than gasoline­powered ones.

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