填空题

This passage explains the basic idea of NGVs and examines the benefits of this technology.

答案： Y

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

答案： Y

The average cost of natural gas is one third less than that of gasoline at the pump.

答案： Y

This passage explains the basic idea of NGVs and examines the benefits of this technology.

答案： Y

Unlike gasoline, natural gas can be regarded as a renewable resource.

答案： N

The biggest advantage provided by NGVs is that they’ help reduce car accidents to a great degree.

答案： N

Not until the ______ were the cars that could burn natural gas invented.

答案： 1930s

Natural gas is mainly made up of methane and other hydrocarbon gases.

答案： Y

The basic principles applied to natural-gas vehicles are quite different from those applied to gasoline-powered vehicles.

答案： N

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

答案： the oil shortages

Natural gas trapped in underground reservoirs is extracted by ______.

答案： drilling wells into the earth