Can dolphins （海豚） talk？Maybe they can not talk with words，but they can talk with sounds．
They show their feelings with sounds．Dolphins travel in a group．We call a group of fish a"school"．They do not study，but they travel together．Dolphins are mammals （哺乳动物），not fish，but they swim together like fish in a schoo1．Dolphins talk to the other dolphins in the schoo1．They give information to the others．They talk when they are happy，sad or afraid．They say"welcome"when a dolphin comes back to the schoo1．They talk when they play．
They make some sounds above water．They make many more sounds under water．People cannot hear these sounds because they are very，very high．Scientists make tapes of the sounds and study them．Sometimes people catch dolphins for a large aquarium （水族宫）．People can watch dolphins in a show．Dolphins do not like to be away from their school in an aquarium．They are sad and lonely．There are many stories about dolphins．They help people．Sometimes they save somebody's life．Dolphins'meat is good，but people do not like to kill them．They say that dolphins bring good luck．Many people believe this．
54．The word"school"in this passage means___．
A．a place for students to study
B．a group of fish travelling together
C．a special kind of animals
D．a place for training dolphins
55．A dolphin makes a sound to___．
A．show other dolphins they are happy
B．tell other dolphins they are sad
C．1et people know they are afraid
D．give information to the other dolphins
56．The best title （题目） for this passage is___．
A．Dolphin's talk
B．Schools of dolphins
C．The dolphin
D．Man's friend．
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