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分层题库｜Tiered Question Bank
所有题目对标 HKEAA 英文原版体系（中文科除外）。按阶段调用不同层级，严禁跨阶段抢跑。
三层题库结构
| 层级 | 使用阶段 | 题源 | 目的 |
|---|---|---|---|
| 1. 基础巩固题库 (Basic) | 阶段1 (2026.7–10) | 单知识点配套，学完即做 | 建立术语与基本范式 |
| 2. 历年真题题库 (Past Paper) | 阶段2 (2026.11–2027.1) | 2012–2026 HKEAA 原版英文卷 | 限时打磨主观题范式 |
| 3. 变式拔高题库 (Advanced) | 阶段3 (2027.2–3) | 真题改角/换 Command Word | 强化抗干扰与迁移能力 |
示例题（每科 2 题示范格式）
Economics（Basic · Elasticity）
Q. The price of good X rises from $10 to $12, and quantity demanded falls from 100 to 80 units. Calculate the price elasticity of demand and state whether demand is elastic or inelastic.
A. %ΔP = (12−10)/10 = 20%; %ΔQd = (80−100)/100 = −20%; Ed = −20%/20% = −1.0 → |Ed| = 1.0 unitary elastic. Business note: a unitary-elastic good yields unchanged total revenue after a price change.
English（Basic · Writing collocation）
Q. Rewrite in formal academic English: "I very like this plan because it can solve many big problems."
A. "I am strongly in favour of this proposal as it would effectively address a number of pressing challenges."
Mathematics（Basic · Probability）
Q. A box contains 5 red and 3 blue balls. Two balls are drawn without replacement. Find the probability that both are red.
A. P = (5/8) × (4/7) = 20/56 = 5/14. (不放回 → 非独立，第二球概率随第一球变化)
Chemistry（Basic · Acids）
Q. State the HKEAA definition of a strong acid and give two examples.
A. A strong acid is an acid which completely ionises in water. Examples: hydrochloric acid (HCl), sulphuric acid (H₂SO₄).
Biology（Basic · Osmosis）
Q. State the definition of osmosis.
A. The net movement of water molecules from a less concentrated to a more concentrated solution through a semi-permeable membrane.
Chinese（Basic · 修辞赏析）
Q. 分析「月光如流水一般，静静地泻在这一片叶子和花上」的修辞效果。
A. 运用比喻，将月光比作流水，化视觉为可感的流动意象，生动写出月光的柔和、澄澈与连绵，烘托出荷塘月夜的静谧之美。
Economics（Basic · Opportunity Cost）
Q. A student with 10 hours can either produce 5 essays or 20 maths problems. What is the opportunity cost of writing 1 essay?
A. 1 essay = 20 ÷ 5 = 4 maths problems forgone. Opportunity cost = the highest-valued alternative given up. (商科核心：任何选择都有隐性成本)
English（Basic · Paper 2 outline）
Q. Give a PEEL paragraph outline answering: "Should secondary students take part-time jobs?"
A. Point: Part-time jobs build responsibility. Evidence: E.g. managing a shop shift teaches punctuality. Explanation: This transfers to university and workplace reliability. Link: Thus supervised part-time work should be encouraged.
Mathematics（Basic · Compound interest · 商科计算）
Q. $10,000 is deposited at 4% p.a. compounded annually. Find the amount after 3 years.
A. A = P(1+r)ⁿ = 10000 × (1.04)³ = 10000 × 1.124864 ≈ $11,248.64. (商科必会：复利≠单利，指数增长)
Chemistry（Basic · Redox test）
Q. State how to test for the presence of reducing agent in a solution.
A. Add a few drops of acidified potassium manganate(VII) (KMnO₄); if the purple colour decolourises, a reducing agent is present. (acidify with dilute H₂SO₄, never HCl)
Biology（Basic · Photosynthesis factor）
Q. Name one limiting factor of photosynthesis at low light intensity and explain.
A. Light intensity. At low light, the light-dependent stage cannot supply enough ATP/NADPH, so the Calvin cycle slows — raising light intensity increases the rate until another factor limits it.
Chinese（Basic · 议论文论点）
Q. 为「自律方得自由」补写一个事实论据。
A. 示例：科比·布莱恩特以近乎苛刻的自律（晨练四点的习惯）换来了赛场上的绝对自由——这正是「自律方得自由」的生动注脚。（论据须具体、有出处、能支撑论点）
标准操作流程
生成变式题固定指令
prompt
Original Question Content: [粘贴原英文题]
Develop 3 HKDSE-standard English variation questions with unchanged core knowledge points, adjust scenario and command words (e.g. State→Explain→Evaluate). Provide complete official marking scheme with detailed scoring items in English.题目标签属性
Subject | Unit | Command Word | Business Relevance (High/Medium/Low) | Terminology Difficulty