48. B 信息理解题。根据第四段可知答案。
49. D 词义猜测题。根据第五段可知答案。
50. C 主旨大意题。通读全文,特别是第一段最后一句可知答案。
56-59 CBDA
D
【文章大意】本文叙述了研究表明噪音污染引起了海洋生物的危险,科学家将来要采取措施拯救海洋生物,阻止噪音对海洋生物的伤害,提醒我们也要意识到保护海洋生物的重要性。
26【答案】C
【 解析】细节理解题。由第一段Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings. 可知噪音污染引起了海洋生物的危险,故选C。
27【答案】B【 解析】细节理解题。由第二段These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves. 可知ocean drilling不是自然的声音,故选B。
28【答案】A
【 解析】段落大意题,根据Decibels (分贝) measured in water are different from those measured on land. 这是中心句可知同一种噪音在陆地和水面产生的效果是不一样,故选A。
29【答案】D
【 解析】推理判断题。根据第六段The research team found that powerful underwater explosions were causing whales in the area to lose their hearing.可知水下巨大的爆炸声会使鲸失去听力,故选D。
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