（2022·上海虹口·一模）Directions: Read the following passage. Summarize the main idea and the main point(s) of the passage in no more than 60 words. Use your own words as far as possible.
Are Oceans Silent?
Most sea creatures, from whales and dolphins to fish, sharks and shrimps, respond to sound, and many can produce it. They use it to hunt and to hide, find mates and food, send messages and give warnings, establish territories, warn off competitors, confuse their targets, deceive enemies, and sense changes in water and conditions. Marine animals click bones, grind teeth and belch gases (磨牙打嗝); use special organs to make various noises. Far from the ‘silent deep’, the oceans are so noisy.
Into this age-long confused noise, in the blink of an evolutionary eye, has entered a new thunder: the trembling sound of mighty engines as 46,220 large ships passed the world’s shipping courses. Scientists say that background noise in the ocean has increased roughly by 15 decibels (分贝) in the past 50 years. It may not sound like much in overall terms, but it is enough, according to many marine biologists, to mask the normal sounds of ocean life going about its business. At its most intense, some even say noise causes whales to become disoriented, dolphins to suffer from ‘the bends’, fish to go deaf, leave their breeding grounds or fail to form groups—enough to disorganize the basic biology of two thirds of the planet.
“Undersea noise pollution is like the death of a thousand cuts”, says Sylvia Earie, chief scientist of the U.S. National Oceanic and Atmospheric Administration. “Each sound in itself may not be a matter of critical concern, but taken all together, the noise from shipping, earthquake-related surveys, and military activity is creating a totally different environment than existed even 50 years ago. That high level of noise is bound to have a hard, sweeping impact on life in the sea.
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【答案】Oceans are never silent as marine creatures mostly produce various sounds to go about their businesses. Now oceans are getting even noisier as humans do more activities there. The resulting noise is loud enough to change the environment and exercise a disturbing impact on marine life.
【知识点】说明文、环境污染
【导语】本文是一篇说明文。文章介绍了海洋里不平静的原因是生物会发出各种声音去进行它们自己的事情，随着人类在海洋中的活动越来越多，海洋也变得越来越嘈杂，由此产生的噪音污染对生物产生了不良的影响。
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