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GRE阅读高频机经原文及答案汇总
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. All of these alternatives are carbon-based fuels whose molecules are smaller and simpler than those of gasoline. These molecules burn more cleanly than gasoline, in part because they have fewer, if and, carbon-carbon bonds, and the hydrocarbons they do emit are less likely to generate ozone. The combustion of larger molecules, which have multiple carbon-carbon bonds, involves a more complex series of reactions. These reactions increase the probability of incomplete combustion and are more likely to release uncombusted and photochemically active hydrocarbon compounds into the atmosphere. On the other hand, alternative fuels do have drawbacks. Compressed natural gas would require that vehicles have a set of heavy fuel tanks—a serious liability in terms of performance and fuel efficiency—and liquefied petroleum gas fac
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