2.Some scientists say that animals in the ocean are increasingly threatened by noise pollution caused by human beings.The noise that affects 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.
29.According to the passage,which of the following is increasingly dangerous to sea creatures?A
A.The man-made noises.
B.The noises made by themselves.
C.The sound of earthquakes.
D.The sound of the ice-breaking.
30.As to the influence of noises on whales,which of the following statements is true?B
A.They are deaf to noises.
B.Noises may hurt them.
C.Noises will limit their ability to reproduce.
D.They are confused by a noise of 120decibels in oceans.
31.We can know from the passage that many scientists think that the noise limit of one hundred twenty decibels wouldA.
A.prevent them from doing their research work
B.benefit (有益于) them a lot in their research work
C.do good to their health
D.increase the industrial output
32.According to the passage,what will scientists most probably do in the future?B
A.They will try their best to make noise.
B.They will work hard to cut down noise pollution.
C.They will study the effect of different noises.
D.They will study the underwater earthquakes.
分析 本文是一篇科普類文章,主要講述了噪聲污染會對海洋生物造成傷害,科學家不知道什么強度什么種類的噪音會對海洋生物造成傷害,然而,許多科學家懷疑噪音比想象中的危害更嚴重,未來他們希望能減少噪音以防止傷害海洋生物.
解答 29.答案:A.細節(jié)理解題.根據"Some scientists say that animals in the ocean are increasingly threatened by noise pollution caused by human beings"知,噪聲污染對海洋生物有害.故選A.
30.答案:B.細節(jié)理解題.根據"They have observed that noises at that level can frighten and confuse whales"知,一定程度的噪音可能會傷害鯨魚.故選B.
31.答案:A.細節(jié)理解題.根據"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"可知,一百二十分貝的噪音限制阻止他們做他們的研究工作.故選A.
32.答案:B.推理判斷題.根據"However,many scientists suspect that noise is a greater danger than they believed.They want to prevent noises from harming creatures in the ocean."可推測出,科學家未來可能會努力減少噪聲污染.
點評 本文是一篇科教類閱讀,題目涉及多道細節(jié)理解題,推理判斷題,做題時應結合文章上下文內容,仔細閱讀原文,并根據所給選項的含義進行分析,從而得出正確答案.切記胡亂猜測,一定要做到有理有據.