Some scientists say that animals in the ocean are increasingly threatened by noi

Some scientists say that animals in the oceanare increasingly threatened by noise pollution caused by human beings. Thenoise that affects sea creatures comes from a number of human activities. It iscaused mainly by industrial underwater explosions, ocean drilling, and shipengines. Such noises are added to natural sounds. These sounds include thebreaking of ice fields, underwater earthquakes, and sounds made by animalsthemselves.

Decibels（分贝）measuredin water are different from those measured on land. A noise of one hundred andtwenty decibels on land causes pain to human ears. In water, a decibel level ofone hundred and ninety-five would have the same effect.

Some scientists have proposed setting a noiselimit of one hundred and twenty decibels in oceans. They have observed thatnoises at that level can frightenand confuse whales.

A team of American and Canadian scientistsdiscovered that loud noises can seriously injure some animals. The researchteam found that powerful underwater explosions were causing whales in the areato lose their hearing. This seriously affected the whales’ ability to exchangeinformation and find their way. Some of the whales even died. The explosions hadcaused their ears to bleed and become infected.

Many researchers whose work depend  on ocean sounds object to a limit of onehundred and twenty decibels. They say such a limit would mean an end toimportant industrial and scientific research.

Scientists do not know how much and whatkinds of noises are harmful to ocean animals. However, many scientists suspectthat noise is a greater danger than they believed. They want to prevent noisesfrom harming creatures in the ocean.

1. According to the passage, which of the following is increasinglydangerous 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.

2. Which of the following is discussed in the second paragraph?

A. Different places with different types ofnoises.

B. The very human ears sensitive to all typesof noises.

C. The same noise measured differently onland and in the ocean.

D. The ocean animal’s reaction to noises.

3. As to the influence of noises on whales, which of the followingstatements 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 toreproduce.

4. We can know from the passage that many scientists think that thenoise limit of one hundred twenty decibels would______.

A. prevent them from doing their researchwork

B. benefit them a lot in their research work

C. do good to their health

D. increase the industrial output

5. According to the passage, what will scientists most probably do inthe future?

A. They will try their best to decreasenoise.

B. They will work hard to cut down noisepollution.

C. They will study the effect of differentnoises.

D. They will protect animals from harmfulnoises.

试题答案

答案：A;C;B;A;D