Some scientists say that animals in the ocean are increasingly threatened by noise pollution caused by human beings. The noise that affects sea creatures es from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.
Decibels(分贝) measured in water are different from those measured on land. A noise of 120 decibels on land causes pain to human ears. In water, a decible level of 195 would have the same effect.
Some scientists have suggested setting a noise limit of 120 decibles in oceans. They have observed that noises above that level can frighten and confuse whales.
A team of American and Canadian scientists discovered that loud noises could seriously injure some animals. The research team found that powerful underwater explosions were causing whales in the area to lose their hearing, which seriously affected the whales’ ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and bee infected(感染的).
Many researches whose work depends on ocean sounds disagree with a limit of 120 decibels. They say such a limit would mean an end to important industrial and scientific research.
Scientists do not know how many and what kinds of noises are harmful to ocean animals. However, many scientists suspect that noise is a greater danger than they previously believed. They want to prevent noises from harming creatures in the ocean.
【小题1】The second paragraph mainly tells us that the noises on land and in water .A．are both from human activities.B．both do harm to sea animalsC．are measured differentlyD．have the same effect on humans【小题2】As to(依据) the effects of noises on whales, which of the following statements is TRUE according to the passage?A．They are deaf to noises.B．Noises at a certain level may hurt them.C．They are easily confused by noises.D．Noises will limit their ability to reproduce.【小题3】Many researchers think that the noise limit of 120 decibels would .A．protect whales from noisesB．benefit them a lot in their research workC．do good to their healthD．increase industrial output【小题4】What will scientists most probably do in the future?A．Count the number of sea animals.B．Stop their research on the ocean.C．Study the effect of different noises.D．Protect sea creatures from harmful noises.C
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(答案→)C
解析：文章介绍噪音可能伤害鲸鱼，及如何保护鲸鱼免受噪音的危害。
【小题1】细节题;从第二段的第一句话Decibels(分贝) measured in water are different from those measured on land.可知陆地上和水里的分贝测量是不一样的，选C
【小题2】细节题：从第四段的第二句和第三句话可知一定程度的噪音可能伤害鲸鱼。选B
【小题3】推理题：从第三段的句子:They have observed that noises above that level can frighten and confuse whales.可以推断出120分贝的噪音限制可以保护鲸鱼免受噪音的危害。选A。
【小题4】细节题：从最后一段的句子：They want to prevent noises from harming creatures in the ocean.
可知答案是D。