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 not too concentrated, but it takes a lot longer when all the garbage is in one spot.

　　70.

　　Which of the following words can replace “be clueless about” in paragraph 2?

　　A. Be familiar with.

　　B. Be curious about.

　　C. Show their interest in.

　　D. Fail to understand.

　　71.

　　What can we learn about the California Green from the idea “If I can’t see it, it’s not happening”?

　　A. They do not know those clean cars are likely coal-burning cars.

　　B. They do believe the coal is burned somewhere else so it looks clean.

　　C. They tend to hold that electricity is a nice part of energy.

　　D. They tend to maintain that gasoline is a good way to run a vehicle.

　　72.

　　According to the passage, compared with cars using gas, electric cars are more _______.

　　A. environmentally-friendly

　　B. expensive

　　C. harmful

　　D. efficient

　　73.

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