Question

  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 hu?man activities. It is caused mainly by industrial underwater explo?sions,ocean drillings,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 one hundred and twenty decibels on land causes pain to human ears. In water,a decibel level of one hundred and ninetyfive 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 louder 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 ex?change information and find their ways. Some of the whales even died. The explo?sions 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.

1. According to the passage,which of the following is increasingly dangerous to sea creatures?

   A. The sound of a car. B. The sound of voices.

   C. Manmade noise pollution. D. The sound of steps.

2. According to the passage,natural sounds include all of the following EXCEPT     

   A. sounds made by animals themselves

   B. ocean drillings

   C. underwater earthquakes

   D. the breaking of ice fields

3. Which of the following is discussed in the third paragraph?

   A. The same noise level produces a different effect on land and in the ocean.

   B. Different places may have different types of noises.

   C. The decibel is not a suitable unit for measuring underwater noises.

   D. Different ocean animals may have different reactions to noises.

4. According to the passage,what will scientists most probably do in the future?

   A. They will work hard to reduce ocean noise pollution,

   B. They will protect the creatures in the ocean from harmful noises.

   C. They will try to set a limit of 120 decibels.

   D. They will study the effect of ocean noise pollution.

Answer 1

[文章大意]研究表明，噪声污染给海洋生物带来了威胁。科学家将要采取措施拯救海洋生物，阻止噪声对海洋生物的伤害。

1. C细节理解题。由第一段的"Some scientists say that ani?mals in the ocean are increasingly threatened by noise pollu?tion caused by human beings."可知，来自人类的噪声污染给海洋生物带来了威胁。

2. B细节理解题。由第二段的"These sounds include the breaking of ice fields,underwater earthquakes,and sounds made by animals themselves."可知选   B.

3. A细节理解题。由第三段可知，同样分贝的噪声在海洋和陆地所造成的影响是不同的。

4. B推理判断题。由文章的最后一句"They want to prevent noises from harming creatures in the ocean."可知，禾斗学家将要采取措施阻止噪声对海洋生物的伤害。