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Round 1 · Section 2 · Interactive labRound 1 · Section 2 · 互动练习

Section 2 Long-Question Lab

Section 2 长题互动练习

5 modules, 15 long questions worked in full, 377 marks.

5 个模块、15 道长题完整讲解，共 377 分。

These 15 questions are the free full-solution sample of Section 2: every part of each long question is worked through, with a figure you can manipulate and a place to check your own numbers. The rest of Section 2 is in the answers-only question bank, and every question is worked in full in the Section 2 book.

这 15 道题是 Section 2 免费开放完整解答的样章：每道长题的每一问都完整讲解，配可以拖动操作的图，并能核对自己算出的数值。其余 Section 2 真题在只给答案的题库里，全部题目的完整过程见 Section 2 题解书。

Every module has the same fixed structure: it opens with the background for the topic, then each past-paper question gets its own tab, always in the same order.

每个模块的结构都一样：先讲这一专题的背景知识，然后每道真题单独一页，顺序固定。

1. →Background背景知识
2. then, for each question:然后每道题：
3. 1Question原题
4. 2Analysis题目分析
5. 3Visualisation可视化
6. 4Try it yourself自己算
7. 5Full solution完整解答
8. 6Traps易错点

Marks are awarded in proportion to the parts you get right; each hint you open takes a quarter off (never below a quarter), and opening the full solution first means the attempt is not scored. Progress is saved only in this browser.

按答对的小问比例给分；每看一条提示扣四分之一（最低保留四分之一），先看完整解答再作答则不计分。进度只保存在当前浏览器里。

Modules · M1–M5模块 · M1–M5

Beyond the lab练习之外