📚 GCSE WJEC Computer Science: Multiple Choice Quick-Kill Techniques | GCSE WJEC 计算机科学：选择题秒杀技巧
Multiple-choice questions (MCQs) are a key part of the GCSE WJEC Computer Science exam. Mastering smart elimination tactics and avoiding common traps can drastically boost your score. This guide walks you through ten proven techniques, each tailored to the WJEC specification, so you can tackle even the trickiest MCQs with confidence.
选择题是GCSE WJEC计算机科学考试的重要组成部分。掌握巧妙的排除法和避开常见陷阱，能大幅提高你的成绩。本指南将带你练习十种经过验证的技巧，每一种都紧扣WJEC考纲，让你自信应对最刁钻的选择题。
1. Reading the Question Carefully and Spotting Keywords | 仔细读题，锁定关键词
Underline or highlight negative words such as “not”, “except”, “incorrect”, and “least likely” before you read the options. Many students lose marks because they answer the opposite of what is asked.
在阅读选项之前，划出或高亮 “not”, “except”, “incorrect”, “least likely” 等否定词。很多学生丢分就是因为答反了题目所问。
Read all four options fully; the first one that seems correct might be a distractor designed to catch hasty readers.
完整读完四个选项；第一个看似正确的很可能是干扰项，专坑急躁的考生。
Rephrase the question in your own words — especially if it contains double negatives — to clarify what is actually being asked.
用自己的话重述题目——尤其当题目含有双重否定时——以明确真正的问题。
2. Using Elimination to Narrow Down Choices | 使用排除法缩小选项范围
Cross out choices that are factually wrong or violate basic computing principles. Reducing four options to two instantly improves your odds to 50%.
划掉那些事实错误或违反基本计算机原理的选项。将四选一变为二选一，正确概率立刻升至50%。
If you spot two options that are direct opposites, one of them is very likely the correct answer.
如果发现两个选项完全相反，其中一个极有可能是正确答案。
Use a ruler or your finger to physically cover discarded answers so you are not tempted to reconsider them.
用尺子或手指遮住已排除的选项，以免忍不住重新考虑它们。
3. Beware of Absolute Statements | 警惕绝对化表述
Words like “always”, “never”, “all”, “every”, “none”, “must”, “impossible” often signal a false statement in computing because there are almost always exceptions.
像 “always”, “never”, “all”, “every”, “none”, “must”, “impossible” 这类词常标志着一个错误说法，因为计算机世界几乎总有例外。
However, some absolute statements are true, e.g. “An AND gate only outputs 1 when all inputs are 1.” Evaluate the statement directly rather than mechanically rejecting all absolutes.
但有些绝对化表述是正确的，例如“与门仅在所有输入为1时才输出1”。要直接评价表述本身，而不是机械地排除所有绝对词。
Look for qualifiers like “some”, “may”, “often”, “usually” — these are more likely to appear in correct answers.
寻找 “some”, “may”, “often”, “usually” 等限定词——它们更可能出现在正确答案中。
4. Handling Binary, Denary, and Hex Conversions Quickly | 快速处理二进制、十进制和十六进制转换
Write out the binary place values: 128, 64, 32, 16, 8, 4, 2, 1. For any 8‑bit binary number, add the values where a 1 appears.
写出二进制位权：128, 64, 32, 16, 8, 4, 2, 1。对于任何8位二进制数，将在1位置上的权值相加。
To convert hex to binary, replace each hex digit with its 4‑bit nibble (e.g. A = 1010, F = 1111). Combine without spaces.
十六进制转二进制时，每位十六进制数字替换为4位二进制半字节（如 A = 1010, F = 1111），然后拼接。
For large denary → binary conversions, repeatedly divide by 2 and read remainders backwards. Many MCQs can be solved by checking the largest power of 2 that fits.
大十进制转二进制时，反复除以2并反向读取余数。很多选择题通过检查能容纳的最大2次幂即可解决。
5. Tracing Pseudocode with Variable Tables | 用变量表追踪伪代码执行
Create a trace table with columns for each variable and an output column. Update values line‑by‑line as the pseudocode runs.
创建一个包含所有变量列和输出列的追踪表，逐行更新伪代码执行时的值变化。
Pay special attention to loop counters; missing an increment step or misreading the condition (e.g. WHILE x < 5 vs. WHILE x <= 5) is a common pitfall.
特别注意循环计数器；漏掉递增步骤或误读条件（如 WHILE x < 5 对比 WHILE x <= 5）是常见陷阱。
If the pseudocode involves an array, draw boxes for indices and fill in values after each assignment.
如果伪代码涉及数组，画出索引方格，并在每次赋值后填入对应的值。
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