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任务型阅读
将方框中的句子还原到文中空缺处。
Can dolphins talk?Maybe they can't talk with words,but they can talk with sounds． 1
They are mammals(哺乳动物),not fish,but they swim together in a group．
Dolphins talk to the other dolphins in a group．They give information．They say“Welcome”when a dolphin comes back to the group． 2 They talk when playing．
They make a few sounds above water． 3 People can't hear these sounds because they are very,very high．Scientists make tapes of the sounds and study them．
Sometimes people catch a dolphin for a large aquarium(水族馆)．Dolphins don't like to be away from their group in an aquarium． 4 There are many stories about dolphins．They help people． 5 People say that dolphins can bring good luck to them．Many people believe this．
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