Tutor-visible context
Student context
Problem context
学生提到了一个合理的原因，却把它说成了充分且唯一的原因。
Learning objective
帮助学生区分促成事件的一个原因和‘唯一原因’的说法。
Context window
Conversation history
No prior conversation. This case starts with the current student message.
Public boundary
What this page does not expose
This public development artifact intentionally excludes ground truth answers, known-misconception annotations, rubrics, and evaluator-only evidence. A future hidden challenge dataset must use the same fail-closed serialization boundary.