What emitted from the exhaust pipe of the GM minivan the author drove is so clean that it is drinkable. One of the advantages o

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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.
One of the advantages of using hydrogen as fuel is that after being used it only produces ______.

选项

答案non-polluting water

解析 由题干关键词One of the advantages of using hydrogen as fuel定位到第三个小标题下第二段。这段指出了氢作为燃料胜过石油的许多好处,其中之一就是它作为燃料使用后的副产品(by-product)是不会引起污染的水
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