2013年4月gre考试备考：gre阅读完整机经集锦（1）
1. 汽油乙醇老G原文 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, and ozone (generated by photochemical reactions with hydrocarbons 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 a ... [ 查看全文 ]2013年4月gre考试备考：gre阅读完整机经集锦（1）的相关文章
