科研之友
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摘要
<正>About 20,000 years ago,the world(世界)is very cold. Ice covers(覆盖)many areas. Animals(动物)try to find a warm place to live(居住). This is when the stories of Ice Age family happen.The squirrel(松鼠)Scrat is always crazy(疯狂的)about burying(埋)his acorn(松果). But this time,he goes into space(太空)and makes a big mistake(错误).
