奥数题the extra time ,in minutes,that is would take to cover a distance of 120km
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奥数题the extra time ,in minutes,that is would take to cover a distance of 120km
travelling at an average speed of 60km/h instead of 72km/h would be-----------
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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