六级The level of emissions they cause will depend on how the electricity to run them is generated, while brakes, tyres and toads all create tiny airborne particles as they wear out.
它们造成的排放水平将取决于运行它们的电力是如何产生的,而刹车、轮胎和蟾蜍都会在磨损时产生微小的空气微粒。
2019年12月六级真题(第二套)阅读 Section A
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