【单选题】【消耗次数：1】
6.心理学研究表明，总得来说，动作技能的成绩随练习而不断提高，但是在这个总的进步过程中，会出现练习时而进步、时而退步的波动起伏现象，有时还会出现进步一时性停顿状态，这个状态被称为什么？
①
阻碍现象
②
停顿期
③
瓶颈期
④
高原现象
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