【参考答案】

　　1.become 改为becoming

　　2.until 改为 when 3. Various song 改为Various songs

　　4.practicing 改为practiced

　　5.perfectly 改为perfect 6.paid for

　　改为pay off

　　7.take part in 改为

　　took part in

　　8.prize 前加 a

　　9.our 改为 his 或者her

　　10.confidence 改为confident

　　Howling is a behaviour commonly observed among a wolf pack. As pack animals, wolves work together to hunt and rely on howling as an important means of communication among each other. There are different explanations of a wolf’s howl and it appears that there may be more to discover.

　　One theory is that wolves howl to bond better together. It’s almost as if howling together helps the pack stay together. Perhaps something similar to people feeling a sense of involvement with each other when singing a song together. But this theory may be wrong, explains Fred H. Harrington, a professor who studies wolf behaviour.

　　Indeed, there have been times when wolves have been seen one moment howling in a chorus, and the next, quarreling among each other. It appears that usually the lowest-ranking members of the pack may actually be“punished” for joining in the chorus at times. So is howling a way to strengthen a social bond or just a way to reconfirm status among its members? —Why do wolves howl for sure?

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