2.22来源：
　　阅读Why一种鱼jump out of water：
　　1. avoid predators
　　2. for communication
　　3. prehistoric7
　　听力：
　　1. alligator（短吻鳄）很少
　　2. they are not social animals
　　3. they're not like whales
　　独立写作： ”It is better to use ones knowledge and experience to solve the problems than ask others for advice." Do you agree or disagree?
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