What emitted from the exhaust pipe of the GM minivan the author drove is so clean that it is drinkable. According to critics, i

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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.
According to critics, it will cost much more spending in our pursuit of ______.

选项

答案hydrogen fuel

解析 由题干关键词According to critics,it will cost much more spending定位到第二个小标题下第四段第二句。批评家们说要寻求用氢做燃料的途径花费会很多,会远远超过总统所提出的十二亿美元。
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