托福听力原文听写：海岸线的腐蚀.docx

智课网TOEFL备考资料托福听力原文听写：海岸线的腐蚀 摘要： 听写是托福听力备考的首要方法，无论什么英语水平的考生都可以采用这种方法来有效提高听力，网络上虽然能找到很多听力的音频但是原文却不多，因此小编为大家带来了托福听力原文听写：海岸线的腐蚀，大家可以根据这个题目去搜索相关音频来练习。 惊喜天天送!扫描二维码获取 小马 免费资料包： 托福 听力考试必背段子汇总PDF格式 点击查看扫描二维码的方法 Questions：47 through 50 Listen to a geologist giving a lecture to an engineering class. Your professor has asked me to talk to you today about the topic that should be of real concern to civil engineers：the erosion of the United States beaches.Let me start with some statistics.Did you know that 90 percent of the coast in this country is eroding，on the gulf of Mexico for instance，erosion averages 4 to 5 feet per year.Over the past twenty years，there has been an increase in building along the coast，even though geologist and environmentalist have been warning communities about problems like erosion.Someway communities have tried to protect their buildings and roads and to build seawalls.However geologists have found that such stabilizing structure actually speed up the destruction of the beaches.These beaches with seawalls，called stabilized beaches，are much narrower than beaches without them.You may wonder how seawalls speed up beach loss.The explanation is simple.If the flow of the beaches is gentle，the water energy is lessened as it washes up along the shore.It is reduced even more that returns to the sea so it doesnt carry back much sand.On the other hand，when the water hit the nearly vertical face of the seawall，it goes straight back to the sea with the full force of its energy and it carries back a great deal of sand.Because of the real risk of losing beaches，many geologists support a ban on all types of stabilizing construction on shore lines. 托福听力 备考需要大量的材料和练习题，为了给考生们节省寻找资料的时间，我们特别将常用的托福听力资料整理出来提供给大家，本文分享的托福听力原文听写：海岸线的腐蚀就是其中之一，如果您还需要更多类似内容可以随时点击下面的下载按钮免费获取。 相关推荐: 托