专题08阅读理解(人物或故事类、科普或环境保护类或健康类、社会现象或历史文化教育类)1
【2018年山东省青岛市】Somescientistssaythatanimalsintheoceanareincreasinglythreatened(威胁)bynoisepollutioncausedbyhumanbeings
Thenoisethatinfluencesseaanimalscomesfromanumberofhumanactivities
Itiscausedmainlybyindustrialunderwaterexplosions(爆炸),oceandrilling,andshipengines
Suchnoisesareaddedtonaturalsounds
Thesesoundsincludethebreakingoficefields,underwaterearthquakes,andsoundsmadebyanimalsthemselves
Decibels(分贝)measuredinwateraredifferentfromthosemeasuredonland
Anoiseofonehundredandtwentydecibelsonlandcausespaintohumanears
Inwater,adecibellevelofonehundredandninetyfivewouldhavethesameeffect(效果)
Somescientistshaveproposedsettinganoiselimit(限度)ofonehundredandtwentydecibelsinoceans
Theyhaveobservedthatnoisesatthatlevelcanfrightenandconfusewhales(鲸鱼)
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