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GRE阅读高频机经原文及答案：乙醇汽油
1. 乙醇汽油 1993年04月
Although, recent years have seen substantial reductions in noxious pollutants from individual motor vehicles, the number of such vehicles has been steadily increasing, consequently, more than 100 cities in the United States still have levels of carbon monoxide, particulate matter (particulate matter: 颗粒物质), and ozone (generated by photochemical reactions with hydrocarbons (hydrocarbon：n.烃, 碳氢化合物) from vehicle exhaust) that exceed legally established limits. There is a growing realization that the only effective way to achieve further reductions in vehicle emissions—short of (short of: adv.缺乏,只要没有) a massive shift away from (away from: 远离) the private automobile—is to replace conventional diesel fuel and gasoline with cleaner-burning fuels such as compressed natural gas, liquefied petroleum gas (liquefied petroleum gas: n.液化石油气a compressed gas that consists of flammable hydrocarbons (as propane and butane) and is used especially as fuel or as raw material for chemical synthesis), ethanol, or methanol.
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