The phenomenon of keeping pets is nothing strang
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一、“心到”。在课堂上应聚精会神，一刻也不能懈怠，大脑要始终处于积极状态，思维要活跃、思路要开阔
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大学英语四级考试：语法大全-特殊词精讲1 8.1 stop doing/to do stop t
