[KongchangAI]
Unverified80% confidenceDecision RuleTime unknown

难度分级合理的逻辑书应做到每册内部至少3个难度台阶、跨册难度重叠约20%,让孩子在新册开头能靠已掌握内容建立信心;单本内难度直线陡升的书会导致中途弃用

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