听力原文

Three groups of dolphins live close to Lantau Island. As the tide comes in, they move with it to feed on small fish or squid which travel with the currents, using echolocation to see their prey through the murky water.
有三群海豚生活在大屿山周围。涨潮时，他们随着潮水利用回声在浑浊的水中定位随水而来的猎物——小鱼和乌贼。
They also use sound to communicate. But they face a deafening problem.
他们还通过声音进行交流。但如今却面临着震耳欲聋的噪音所带来的问题。

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重点讲解

重点讲解：
1. close to
近的；接近的；
eg. Warm weather has attracted the flat fish close to shore.
煦暖的气候将比目鱼引到了近海。
eg. David's house is quite close to the Global Theater.
大卫的家离环球剧院很近。
2. come in
（潮）涨；
eg. The tide usually starts to come in at about six o'clock.
通常六点钟就开始涨潮了。
eg. The tide doesn't come in for six hours!
6小时后才涨潮！
3. feed on
以…为食，以…为能源；
eg. The caterpillars feed on a wide range of trees, shrubs and plants.
毛虫以各类树木、灌木和植物为食。
eg. Birds feed on nuts and berries in the winter.
鸟类靠坚果和浆果过冬。