2015年6月28日GRE真题回忆

2015-06-30 15:51:31 作者:无 来源:匿名 次数:2836

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导读: 环球北美考试院官网为大家带来了2015年5月23日GRE真题回忆​及答案解析,包括写作与阅读部分,希望考生都能取得好成绩!
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环球北美考试院官网为大家带来了2015年5月23日GRE真题回忆及答案解析,包括写作与阅读部分,希望考生都能取得好成绩!

  2015年6月28日GRE真题回忆写作部分内容:

  ISSUE:

  College students should be encouraged to pursue subjects that interest them rather than the courses that seem most likely to lead to jobs.

  Write a response in which you discuss the extent to which you agree or disagree with the recommendation and explain your reasoning for the position you take. In developing and supporting your position, describe specific circumstances in which adopting the recommendation would or would not be advantageous and explain how these examples shape your position.

  2015年6月28日GRE真题回忆阅读部分内容:

  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 any, 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 faces fundamental limits on supply.

  Ethanol and methanol, on the other hand, have important advantages over other carbon-based alternative fuels: they have a higher energy content per volume and would require minimal changes in the existing network for distributing motor fuel. Ethanol is commonly used as a gasoline supplement, but it is currently about twice as expensive as methanol, the low cost of which is one of its attractive features. Methanol’s most attractive feature, however, is that it can reduce by about 90 percent the vehicle emissions that form ozone, the most serious urban air pollutant.

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