【 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. Which of the following is true of whales?
A. They won't be confused by noises.
B. They are deaf to noises.
C. Their ability to reproduce will be lowered by high-level noises.
D. Their hearing will be damaged by high-level noises.
【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。
30. According to the passage, what will scientists most probably do in the future?
A. They will work hard to reduce ocean noise pollution.
B. They will protect animals from harmful noises.
C. They will try to set a limit of 120 decibels.
D. They will study the effect of ocean noise pollution.
【答案】B【 解析】推理判断题。由文章的最后一句话They want to prevent noises from harming creatures in the ocean. 可知科学家将来要采取措施阻止噪音对海洋生物的伤害,故选B。
A,B,C或D四个选项中,选出最佳选项。
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