A
Dolphins are not fish,but warm-blooded animals.They live in groups,and speak to each other in their own language.In this 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 own,and they live a long time—at least twenty or thirty years.
Like some other animals,dolphins use sound to help them find their way around.They also make these sounds to talk to each other and to help them find food.We now know they do not use their ears to receive these sounds,but the lower part of the mouth,called the jaw.
Strangely,dolphins seem to like man,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.
21.Dolphins are different from many other animals in that they .
A.live in groups
B.have brains almost as large as ours
C.are warm-blooded
D.have their own language
答案B
解析细节理解题。根据第一段最后两句话可知,海豚与其他动物不同的是它的大脑与人脑的大小接近。
22.Why did the sailors off the coast of New Zealand look for Jack?
A.He was lonely and liked to be with people.
B.They enjoyed playing with him.
C.He was seriously wounded.
D.They wanted his help.
答案D
解析细节理解题。根据第三段倒数第三句话“From1871to1903Jackmeteveryboatintheareaandshowedittheway.”可知杰克可以帮助水手,给他们带路。
23.By telling the story of Jack the author wanted to show that .
A.dolphins are friendly and clever
B.people are cruel to animals
C.Jack is different from other dolphins
D.dolphins should be protected by law
答案A
解析主旨大意题。根据第三段第一句话“Strangely,dolphinsseemtolikeman,andforthousandsofyearstherehavebeenstoriesaboutthedolphinanditsfriendshipwithpeople.”及全文可知A项正确。
