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The loud continuous noise of the cars or the sound of a plane can force its way into the deepest for...
题目内容:
The loud continuous noise of the cars or the sound of a plane can force its way into the deepest forest, yet it’s not only humans that are bothered by the noise.
Bioacoustician Bernie Krause has been studying the effect of noise pollution on wildlife, and has come across some interesting behaviors, especially among animals that communicate by vocalization(发声), like humans. Birds use sound to communicate, but in noisy places, these animals have to shout over the natural noise to be heard.
Krause mentions a study of nightingales to clarify what he means. The birds responded to traffic noise by singing louder and louder until they actually went beyond noise pollution standards in the city. To belt out (sing loudly) their songs, they increased their lung pressure fivefold, but scientists state that this is not dangerous for the birds themselves.
Studies show that sudden noise can cause certain birds to leave their nests, exposing the young to their enemies. One study also showed that songbirds that nested close to busy motorways were much less productive than those that nested farther away. Mammals(哺乳动物)too are affected. A recent study showed that nursing caribou responded to plane noise by not producing enough milk to feed their young.
In some cases noise pollution can actually help some animals while harming others. Toads(蟾蜍)and frogs are known to vocalize in synchrony(同步;同步方式)so that no predator (their enemies) can zero in on them. Krause found that when planes flew overhead and disturbed the toad’s song, they lost their synchronicity, and it took them 45 minutes to get it back again. That gave their natural enemies plenty of time to find and catch individual toads by sound.
According to Kruse, “Not only will noise pollution bother wildlife, but it won’t help our lives either.”
1.How do young caribou suffer from aircraft noise?
A. They receive less food. B. They can’t sleep at night.
C. They are often displaced. D. They can’t hear their mothers.
2.What would happen if toads and frogs failed to sing in union?
A. They might become defenseless.
B. They would stop communicating.
C. They would soon regain their rhythm.
D. They might ne unable to hunt in groups.
3.What is the text mainly about?
A. The effects of noise pollution on wildlife.
B. The causes of noise pollution.
C. Animals’ reaction to noises.
D. The ways animals communicate with each other.
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