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conversations and interrupting your sleep, you can call the police. But what is a whale to do?
Natural noise from waves, wind, rain and even earthquakes is common in oceans. Unfortunately,
man-made noise from oil and gas drilling, sonar, and ships is also present.
Low frequency noise has doubled off the California coast every decade since the nineteen sixties.
The main reasons are ships' propellers (螺旋桨). They not only generate continuous low frequency
sound, some propellers cavitate (形成气穴), which means they create air bubbles that collapse,
creating loud popping sounds.
Whales use low frequency calls to communicate across thousands of miles of ocean. They are
threatened by noise pollution because it can prevent them from contacting each other and from locating
their foods. Endangered humpback and right whales, which use fibrous baleen to strain food from the
water, are the most at risk.
Scientists studying right whales off Canada's east coast have discovered that whales are sending
louder calls through the water to make themselves heard. Because they invest more energy in making
calls, they have less energy available for finding food and mating. Other scientists measuring whale calls
against background noise pollution have discovered that right whales have lost about eighty percent of
their normal communication area. This could seriously affect survival of this already threatened species.
Scientists don't have badges and guns, but they are trying to correct the noise pollution problem. By
tracking ships and marine mammals and understanding how noise travels, they are creating sound maps.
They hope to get shipping lanes moved so that the noise pollution ships create will not overlap with areas
most important to the whales.
C. Natural noise is good for whales.D. How to protect whales endangered.
B. Low frequency noise has doubled off the Canadian coast every decade since 1960s.
C. Noise pollution can prevent whales from contacting each other and from locating prey.
D. Endangered humpback and right whales are the most at risk.
B. Scientists are creating the sound maps by tracking ships and marine mammals.
C. If scientists have guns, they can correct the noise pollution.
D. Scientists have worked out a plan to protect the whales.
B. Right whales cannot find food and mate for they lose a lot of living area.
C. There are about 20% of the normal communication areas still available for the right whales.
D. The right whales always invest most of their energy for making calls.
B. Whales can communicate with each other by diving into the deep water.
C. Whales cannot find mates because they don't have enough energy.
D. The communication between whales is through low frequency calls
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animals that need voluntary help. Compared to humans, animals are luckier because they do not know how to express their emotions (情感). They do not know how to express what they want and they do not
know how to express what makes them hurt. Some people may think that volunteering to help animals is
hard; it may be true but _____.
If you volunteer to help animals in China, you can help support the endangered (濒危的) species of
pandas. The country of Costa Rica offers a sea turtle conservation area (保护区). You can work on the pacific coasts or in the Caribbean and save one of the most unusual creatures in the world, the sea turtles. But if you want thrills and adventures, you can volunteer to help feed those rare white lions in the Lion Park in Johannesburg, a city of South Africa and have fun with other wild animals. You can also go to
Guayaquil, Ecuador where international volunteer programs have been offered include helping animals like crocodiles. Volunteering in Malaysia is a great experience too. Taking good care of the orangutans
(猩猩), feeding them right and saving them from any illness are just some of the things you can do. Aside
from the countries being mentioned above, you can also volunteer in some other countries that have the
same volunteer program being offered.
answer within 15 words.)
2. Translate the underlined sentence in this text into Chinese.
3. Fill in the blank with proper words or phrases. (Please answer within 8 words.)
4. Which sentence in the text can be replaced by the following one?
Besides these countries, all the countries joining the volunteer program can offer animal volunteer
jobs.
5. Do you agree that animals are luckier than human beings? And why? (Please answer within 30 words.)
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