2020落下帷幕，通过对过往的真题题型统计，我们不难发现单选题依然稳居Part2、3宝座，做好单选题仍是我们获取高分的关键。但是同时单选题也是一些同学们‘闻风丧胆’的题型，不少同学表示自己单选题正确率不高，害怕做此题型。所以，我们要好好学习单选题做题技巧，迎难而上，获得高分。
单选题主要分布在Part2、3当中，在这两个部分当中，Part3会比Part2较难一些，主要体现在以下几个方面，1.话题变为学术话题；2.说话人数变多；3.选项变长；4.同义替换变难。单选题所有选项一般都会被提及，且选项出现的顺序通常是乱序的，使得学生出现在做题的过程中，明明听到了每一个选项，却难以抉择。甚至明明听到了答案句，一选又都是错的。有同学表示，同义替换有时真的很难理解，这时，我们可以换个角度来解题，即通过排除错误选项来推出正确答案，这次给大家介绍的方法就是其中之一，叫做排除法之‘答非所问’。
我们来看一个例子（剑14Test1Section3） 。
21. Carla and Rob were surprised to learn that coastal cities
A contain nearly half the world’s population.
B include most of the world’s largest cities.
C are growing twice as fast as other cities.
答案原文：
Rob: …I mean, we know that more than half the world’s population lives in cities now.
Carla: Yeah, though that’s all cities, not just one on the coast. But most of the biggest cities are actually built by the sea.
根据划线部分可知，biggest与largest同义替换，该题的正确答案选B。但是，很多同学在做题的过程中会误选A选项，因为他们听到了‘more than half the world’s population lives in cities now.’觉得与选项A完全匹配，确实，这一段话与A选项是几乎符合的，但是如果大家再往后听一句会听到Carla回答道‘Yeah, though that’s all cities, not just one on the coast. ’ Carla的意思是上文说的是所有城市，而不是沿海城市。回到21题题干我们会发现，题干问的是coastal cities而不是all cities，故排除该选项，排除原因为答非所问，也就是题干不符。
让我们再用同样的方法来分析该篇题的24题。
24. What do Rob and Carla think that the authorities in Miami should do immediately?
A take measure to restore ecosystems
B pay for a new flood prevention system
C stop disposing of waste materials into the ocean
答案原文：
Carla: So what are the authorities doing about it now?
Rob: I don’t know. I did read that they’re aiming to stop disposing of waste water into the ocean over the next ten years.
Carla: But that won’t help with flood prevention now, will it?
Rob: No, Really they just need to find the money for something to replace the drainage channels, in order to protect against flooding now. But in the long term they need to consider the whole ecosystem.
由划线部分可知protect against同义词替换prevention，drainage channels上下义替换system，本题答案为B。但由于本题同义替换较为复杂，很多同学会选择A或者C选项，那我们来一个个分析。首先A选项在原文中说的是‘But in the long term they need to consider the whole ecosystem.’里面出现了一个时间概念‘in the long term’与题干的immediately不匹配，故排除。选项C在原文中说的是‘they’re aiming to stop disposing of waste water into the ocean over the next ten years.’ 里面出现了一个时间概念‘over the next ten years’也与题干的immediately不匹配；另外，也紧接着听到Carla的表转折的话语：“But that won’t help … now”也是在说现在没有帮助，同样与题干的immediately不匹配，故以上两上点都可排除C项。综上我们不难看出，两个选项都可通过时间限定来排除，大大降低了该题的难度。
希望大家在本次学习之后能更加关注题干的限定要求，包括常见的时间限定、地点限定、形容词限定、主语限定等，‘快，准，狠’地排除错误选项，选出正确答案，将单选题逐一击破。
