填空题

People resumed their interest in natural gas as a fuel as a result of __________ of the late 1960s and early 1970s.

【参考答案】

the oil shortages

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填空题

NGVs aren’t as roomy as gasoline cars because they have to give up cargo and trunk space to accommodate the ______.

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During the 19th century, gas was used on a local scale because of the difficult situation in ______.