文章主要讲的是声音污染在近些年来不断的恶化，这些声音污染不利于人类和动物的身体健康。噪音也需要控制，保护音频生态。下面前程百利小编带大家一块看一下这篇托福听力背景材料中出现的生词和疑难句，正在备考托福听力的同学可以参考一下。
It's harder and harder to find peace and, especially, quiet. Just ask a field researcher deep in the wilderness. Even in the most remote parts of Alaska the sound of a jet crossing overhead is all too common.
So scientists with the National Park Service set off across the U.S. to study our audio ecology. They recorded more than a million hours of sound from the depths of the Great Basin's deserts to the hurly burley of the megalopolis that stretches from Boston, through New York City and on to Washington, D.C.
They found that if you're craving quiet on the east coast head to the north woods of Maine or the Adirondacks in upstate New York. But for real quiet—defined as less than 20 decibels—the West is best.
The great swath of territory west of the Rockies but east of the western coast includes national parks, wilderness areas and even public lands that are probably as quiet as they were centuries ago. The researchers made that claim while presenting their findings at the annual meeting of the American Association for the Advancement of Science on February 16th.
Noise pollution is not good for people and it's even worse for animals with more sensitive ears, like bats. And the problem is not confined to land but echoes across the seas as well, where human-produced noise interferes with the lives of various ocean dwellers, including whales. These days on Earth it's rare to hear [silence].
疑难词汇：
audio ecology 音频生态;声音生态
decibel 分贝
长难句解析：
1. And the problem is not confined to land but echoes across the seas as well, where human-produced noise interferes with the lives of various ocean dwellers, including whales.
难句类型;
Where关系副词
句子主干;
the problem is not confined to land
难句拆分;
Where关系副词引导定语从句修饰the seas
好了，以上就是前程百利小编为大家整理的托福听力背景材料中学单词+疑难句之噪声污染，希望在备考的路上助大家一臂之力。最后，小编祝大家在托福考试中取得好成绩！
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