题目内容
（补全单词）It swims fast and lives in the ocean(海洋)．It's very i _____ and f _____ ．It's a d _____ ．
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题目内容
（补全单词）It swims fast and lives in the ocean(海洋)．It's very i _____ and f _____ ．It's a d _____ ．