res.bakclass.com
备课资源
贝壳网是一个针对中小学教学的教学备课资源库，海量的教学资源节省了老师的备课时间，优课大师、优课资源、一课一网的展现形式让老师教学手段更加丰富，同时贝壳网也提供科学的分层教学方案，让学生真正的体会“因材施教”的乐趣
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