Dolphins are not fish, but warm-blooded animals．They live in groups, and speak to each other in their own language．In a way they are like other animals, such as bees and birds．But dolphins are very different from almost all land animals．Their brain is nearly the same size as our humans, and they live a long time－at least twenty or thirty years．

　　Like some animals, dolphins use sound to help themselves find their way around．They also make the sound to talk to each other and to help them find food．We now know they do not use their ears to receive the sound, but the lower part of the mouth, called the jaw．

　　Strangely, dolphins seem to like humans, and for thousands of years there have been stories about the dolphin and its friendship with people．

　　There is a story about sailors in the 19th century．In a dangerous part of the sea off the coast of New Zealand, they learnt to look for a dolphin called Jack．From 1871 to 1903, Jack met every boat in the area and showed it the way．Then in 1903, a passenger on a boat called The Penguin shot and wounded Jack．He recovered and for nine years more continued to guide all ships through the area－except for The Penguin．

　　Today, some people continue to kill dolphins, but many countries of the world now protect them and in these places it is against the law to kill them．

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阅读理解

　　The word “sport” first meant somethin that people did in their free time．Later it often meant hunting(捕猎)wild animals and birds．

　　About a hundred years ago the word was first used for organized games．This is the usual meaning of the word today．People spend a lot of their spare time playing football, basketball, tennis and many other sports．Such people play because they want to．A few people are paid for the sport they play．These people are called professional sportsmen．They may be sportsmen for only a few years, but during that time the best one can earn a lot of money．

　　For example, a professional footballer in England earns more than ＄3000 a year．The starts earn a lot more．International golf and tennis champions(网球锦标赛)can make more than ＄50000 in a year．Of course, only a few sporsmen can earn as much money as that．It is only possible in sports for individuals(个人的)like golf, tennis and motor-racing．Perhaps the most surprising thing about sportsmen and money is that：the star can earn more money from advertising than from sport．An advertising for sports equipment(设备)does not simply say “Buy our thing”．It says “Buy the same shirt and shoes as …”．Famous sportsmen can even advertise things like watches and food．They allow the companies to use their name or a photo of them and they are paid for this．Sport is no longer just something for people’s spare time．

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