【科学60秒】高效机油再生_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】高效机油再生

听力简介：

To keep your car purring, you have to change the oil. Such maintenance produces eight billion gallons of used motor oil annually. Some waste oil does get re-refined to produce oil for ——____1____ or heating. And some just ____2____. So it would be more environmentally friendly and provide fresh fuel if we could convert the old motor oil to something really valuable: new gasoline. And that’s what a research team thinks they’ve done. They presented their work at the annual meeting of the American Chemical Society.
Their approach involves pyrolysis, ____3____ organic material with heat ____4____. Pyrolysis can break down waste oil into gases, liquids, a little bit of solids. The gases and liquids can be converted into gas or diesel. But conventional pyrolysis methods don’t do a great job with motor oil.
The new technique mixes the oil with a material really good at absorbing microwave radiation. Tests showed that heating this mixture with microwaves was about 90 percent efficient at creating precursors to fuel—which beats ____5____.
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