15．
Can dolphins talk？Maybe they can't 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 them a
"school"．They don't study，but they travel together．Dolphins
talk to other dolphins in the school．They give information．They
tell other dolphins when they are happy or sad or afraid．They said"welcome"when a dolphin comes back to the school．They talk when they play．They make a few sounds above water．They make many more sounds under water．People can't hear these sounds because they are very high．
Sometimes people catch dolphins for large aquariums（水族馆）．People can watch the dolphins in a show．Dolphins don't like to be in an aquarium，being away from their school．They are sad and lonely if they do so．
There are many stories about dolphins．They help people．Sometimes they save someone's life．Many people believe that dolphins can bring them good luck．
41．Dolphins show their feelings withC．
A．pictures B．words C．sounds
42．DolphinsAin the school according to the passage．
A．give information B．talk when they sleep
C．say"sorry"when a dolphin comes back
43．People can't hear the dolphin's sounds becauseC．
A．they are above the water B．they are under the water C．they are very high
44．How do dolphins feel when they are away from their school？B
A．Happy B．Lonely C．Excited
45．Many people believe that dolphins can bringA to them．
A．good luck B．health C．wealth．
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