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PU1 U6单词2
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zebra 斑马
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monkey 猴子
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elephant 大象
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bear 熊
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polar bear 北极熊
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giraffe 长颈鹿
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tiger 老虎
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lizard 蜥蜴
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hippo 河马
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crocodile 鳄鱼
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snake 蛇
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