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

Some scientists say that animals in the ocean areincreasingly threatened by noise pollution caused by human beings. The noisethat affect sea creatures comes from a number of human activities. It is causedmainly by industrial underwater explosions, ocean drilling, and ship engines.Such noises are added to natural sounds. These sounds include the breaking ofice fields, underwater earthquakes, and sounds made by animals themselves.

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 noise limit ofone hundred and twenty decibels in oceans. They have observed that noises atthat level can frighten and confuse whales.

A team of American and Canadian scientists discoveredthat loud noises can seriously injure some animals. The research team foundthat powerful underwater explosions were causing whales in the area to losetheir hearing. This seriously affected the whales’ ability to exchangeinformation and find their way. Some of the whales even died. The explosionshad caused their ears to bleed and become infected.

Many researchers whose work depends on ocean soundsobject to a limit of one hundred and twenty decibels. They say such a limitwould mean an end to important industrial and scientific research.

Scientists do not know how much and what kinds ofnoises are harmful to ocean animals. However, many scientists suspect thatnoise is a greater danger than they believed. They want to prevent noises fromharming creatures in the ocean.

1.According to the passage, which of the following isincreasingly 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.

2.As to the influence of noises on whales, which ofthe 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.

3. We can know from the passage that many scientiststhink 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

4.According to the passage, what will scientists mostprobably 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.

试题答案

【答案】

1.A

2.C

3.A

4.C

【解析】

试题