有趣的数学活动，探讨了加法和减法之间的反比关系。
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教学资源
告诉时间淘汰
Practice telling time to the minute by reading analog and digital clocks with this competitive whole-class game.
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教学资源
这个或那个！PowerPoint Game - Singular and Plural Nouns
An active PowerPoint game to practice working with singular and plural nouns.
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