◆答案涉及数字的，一般要有简单的四则运算。
题目问how many/how much/what proportion/what is the cost 时，答案一般不会直接是原文中出现的数字而要涉及到简单的四则运算，通常是加减法。
原文：all major cities there have high car ownership, but well-developed bus and rail systems are available, and overall public transport typically accounts for between 20 and 30 percent of passenger-kilometers.
题目：What proportion of passenger kilometer is undertaken by private automobile in western europe.
答案及解释：很多同学误答20%-30%。原文说：公共交通占20%-30%。题目问：私人小轿车所占的比例。答案应为：70%-80%。
◆答案涉及钱币的，在数字前一定要有货币符号，在数字后可能会有单位。
原文：There may have been some consolation in the fact that the bid came in $1 million below the revised budget and $5 million below the original budget of $29 million formulated in mid-1991. 题目：What was the cost of the revised budget for the Sydney bid?
答案及解释：此题应该是考过的题目中运算最复杂的。费用比修改后的预算少1 million，比最初的预算少5 million，最初的预算是29 million，所以，修改后的预算应为$25 million。注意，这三个词，25、$25、25 million 都是错误的答案。
◆找到答案后，要向后看一两句，看有无重大的改变。
原文中常用转折词修改前面说过的话或作补充。因此，对有些陷阱性题目，找到答案后，要向后看一两句，看有没有转折词。一般只向后看一两句即可，不用看得太远。
原文：Your iron is designed to function using tap water. However, it will last longer if you use distilled water.
题目：What sort of water are you advised to use?
答案及解释：题目问：建议你使用什么样的水？有的同学从原文的第一句中得出答案：tap water(自来水)，但原文中马上就有一个转折词however，正确答案为：distilledwater(蒸馏水)。
责任编辑：虫虫
