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随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本，课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒When I was twelve years old, my family were the first black people to move into an all-white part of Grand Rapids, Michigan.Many of our new __31 weren’t very kind.Some of the adults said __32 that we should return where we came __33 .The children sometimes threw stones at me or drove me home from __34.
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