What emitted from the exhaust pipe of the GM minivan the author drove is so clean that it is drinkable. The Hy-Wire, a hydrogen

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问题 What emitted from the exhaust pipe of the GM minivan the author drove is so clean that it is drinkable.
The Hy-Wire, a hydrogen fueled car produced by GM, is controlled through ______.

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答案wires

解析 由题干关键词Hy-Wire定位到第二个小标题下第五段第二句。GM生产了一种叫做Hy-Wire的氢燃料汽车这种车没有内置发动机,没有仪器板(instrument panel),没有刹车闸和加速踏板,这种车是通过电线来控制的。
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