1 Listen and say! 听和说! seventeen 十七 eighteen 十八 nineteen 十九 What number is it? 这是数字几? Seventeen. 十七。
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电子课本下载:http://mp3.en8848.com/xiaoxue/jijiao1/jijiao12a201207/unit3-4.mp3
lrc下载:http://mp3.en8848.com/xiaoxue/jijiao1/jijiao12a201207/unit3-4.lrc