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Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
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    원소

    원소

    by Whakuk Lee //at grade

    원소와 그의 성질, 원소의 역사, 원소와 원자의 관계

  • Read
    Elements-Quest 2014

    Elements-Quest 2014

    by Dannielle Wentzel //at grade

    Elements and their different properties, the history of elements and how atoms relate to elements.

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