2017年雅思考试阅读练习试题附答案解析.doc

2017年雅思考试阅读练习试题附答案解析 　　说大话的人像爆竹，响一声就完了。 鉴难明，始能照物;衡唯平，始能权物。以下是小编为大家有哪些信誉好的足球投注网站整理的2017年雅思考试阅读练习试题附答案解析，希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生! 　　Changes in Air 　　A 　　A federal ban on ozone-depleting chlorofluorocarbons (CFCs), to conform with the Clean Air Act, is, ironically, affecting 22.9 million people in the U.S. who suffer from asthma, Genetic inhaled albuterol, which is the most commonly prescribed short-acting asthma medication and requires CFCs to propel it into the lungs, will no longer be legally sold after December 31, 2008. Physicians and patients are questioning the wisdom of the ban, which will have an insignificant effect on ozone but a measurable impact on wallets: the reformulated brand-name alternatives can be three times as expensive, raising the cost to about $40 per inhaler. The issue is even more disconcerting considering that asthma disproportionately affects the poor and that according to recent surveys, an estimated 20 percent of asthma patients are uninsured. 　　B 　　The decision to make the change was political, not medical or scientific, says pharmacist Leslie Hendeles of the University of Florida, who co-authored a 2007 paper in the New England Journal of Medicine explaining the withdrawal and transition. In 1987 Congress signed on to the Montreal Protocol on Substances That Deplete the Ozone Layer, an international treaty requiring the phasing out of all nonessential uses of CFCs. At that time, medical inhalers were considered an essential use because no viable alternative propellant existed. In 1989 pharmaceutical companies banded together and eventually, in 1996, reformulated albuterol with hydrofluoroalkane. 　　C 　　The transition began quietly, but as more patients see their prescriptions change and costs go up, many question why this bail must begin before generics become available. At least one member of the FDA advisory committee, Nicholas J. Gross of the Stritch-Loyola School of Medicine, has publicly regretted the decision, recanting his support and