One of America's biggest circuses（马戏团）will soon end elephants in its shows．The circus said it would stop by 2018．All its elephants will move to an animal conservation center． They will retire there．The circus is doing this because of public protests（抗议）．One hundred years ago，it was OK for animals to perform for humans．However，not today．People are worried about animals．The circus will continue to use other animals， such as camels，dogs，horses，lions and tigers．

Animal rights groups have told the circuses not to use the elephants．They said that circus elephants have a bad life，said many elephants have painful bones and lung diseases．They want the elephants to retire now．Many places in the USA were asked not to use the elephants．This makes it hard for circuses to go around the country．The owners of the circus said it was hard to stop using their elephants．They understand the people love watching the elephant's show．

根据短文内容，完成下列小题．
【小题1】When will the circuses end elephants in its shows？
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【小题2】Why did the circuses stop using the elephants？
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【小题3】How did the people think of the animals' perform for humans 100years ago？
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【小题4】Why are people worried about animals in the circuses？
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【小题5】What makes it hard for the circuses to go around America？
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