最常见托福听力材料:噪音影响

所属专题:托福听力  来源:互联网    要点:托福听力  
编辑点评: 托福听力材料涉及到多种话题,不过,有些经典话题会在各次考试中重复出现,大家如果能掌握这些话题及相关词汇,应该会对答题很有帮助。下面为大家整理的“噪音影响”方面的托福听力材料,希望对大家有所帮助。

托福听力段子:噪音影响

I’m grad to see so many of you here. We’ve become really alarmed over the health center by the number of students we are seeing, who are experiencing hearing loss. First, I want to go over some basic about hearing. Then we can take a look at our school environment and see if we can figure out some ways to protect hearing. The leading cause of preventable hearing loss is excessive noise. Too much moderate noise for a long time or some types of intense noise for even a short time can damage hearing. Loudness is measured in units called decibels. One decibel is the lowest sound that the average person can here. Sounds up to 80 decibels generally aren’t harmful. That’s noise like traffic on a busy street. But anything louder than 80 decibels, especially with continuous exposure, may eventually hurt your hearing. Once you are up to around 140 decibels, that’s like a jet plane taking off, then you might even feel pain in your ears. And pains are sure sign that your hearing’s at risk. Even one exposure to a really loud noise at close range can cause hearing loss. So what you need to do is limit your exposure to harmful levels. If you pass along this handout, we can take a look at the decibel level of some common campus sounds. Notice how loud those horns are that people take to football games. They are really dangerous if blown right behind you. Now, let’s try to generate a list of damaging noises

以上是常考的托福听力材料,托福听力常考话题一般包括校园,历史,艺术,自然等方面,大家也可以从这个方向去积累一些背景词汇和背景知识,从而提高托福听力正确率。

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