For ages，sailors have said that it is a good luck to see dolphins swum alongside boats.Their presence meant that land is near，which will be vital informations if a boat and her crew are in danger.Some dolphins have even protected sailors which suffer shipwreck from sharks.There is no wonder that these unique and fascinating creatures have long known as our friends.

　　Dolphins are thought to be intelligent animals because of its quick ability to learn.They communicate through a combination of whistles and clicks.While scientists don’t know exact what they are talking about，it is thought that dolphins are telling each other that food is nearby，or warning each other for approaching danger.

　　答案

　　For ages，sailors have said that it is a

　　good luck to see dolphins

　　alongside boats.Their presence

　　that land is near，which will be vital

　　if a boat and her crew are in danger.Some dolphins have even protected sailors

　　suffer shipwreck from sharks. is no wonder that these unique and fascinating creatures have long

　　known as our friends.

　　Dolphins are thought to be intelligent animals because of

　　quick ability to learn.They communicate through a combination of whistles and clicks.While scientists don’t know

　　what they are talking about，it is thought that dolphins are telling each other that food is nearby，or warning each other

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