Some scientists say that animals in the ocean are increasingly threatened by noise pollution caused by human beings. The noise that affect sea creatures comes 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（分貝）measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.
Some scientists have proposed setting a noise limit of one hundred and twenty decibels in oceans. They have observed that noises at that level can frighten and confuse whales.
A team of American and Canadian scientists discovered that loud noises can seriously injure some animals. The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This 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 become infected.
Many researchers whose work depends on ocean sounds object to a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.
Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists suspect that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.
小題1:According to the passage, which of the following is increasingly dangerous to sea creatures?
A．The man-made noises.
B．The noises made by themselves.
C．The sound of earthquakes.
D．The sound of the ice-breaking.
小題2:As to the influence of noises on whales, which of the following statements is true?
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.
小題3: We can know from the passage that many scientists think that the noise limit of one hundred twenty decibels would______.
A．prevent them from doing their research work
B．benefit them a lot in their research work
C．do good to their health
D．increase the industrial output
小題4:According to the passage, what will scientists most probably do in the future?
A．They will try their best to decrease noise.
B．They will work hard to cut down noise pollution.
C．They will study the effect of different noises.
D．They will protect animals from harmful noises.

小題1:A
小題2:C
小題3:A
小題4:C

試題分析：科學家認為,人類海上活動導致的噪音污染對海洋生物的健康和行為產(chǎn)生了巨大的影響，甚至威脅到了他們的生存。雖然科學家不知道什么樣的噪音對海洋生物有害，然而許多科學家懷疑噪聲的危害要遠遠大于他們想象的程度，因此他們要努力去防止噪聲對于海洋動物的危害。
小題1:A細節(jié)理解題。根據(jù)文章首句Some scientists say that animals in the ocean are increasingly threatened by noise pollution caused by human beings.可知科學家認為海洋動物受到了人類噪音的威脅，故A選項正確。
小題2:C推理判斷題。根據(jù)文章第四段This seriously affected the whales’ ability to exchange information and find their way.可以推斷這些海洋噪音影響到了鯨魚的聽力和導航能力，所以判斷C選項正確。
小題3:A細節(jié)理解題。根據(jù)文章倒數(shù)第二段They say such a limit would mean an end to important industrial and scientific research.可知科學家們認為對于分貝的控制會影響一些工業(yè)和科學研究工作，所以A選項正確。
小題4:C推理判斷題。在文章末段作者提到“盡管科學家們不知道哪些噪音威脅著海洋動物，但是他們要想辦法去阻止噪音對于海洋生物的危害”，由此推斷為了保護海洋動物他們會努力去研究這些噪音，選C。
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