当我们学习累了的时候,特别是做听力题累了的时候,大家可以设着研究一下雅思听力考试的设置和答案,其实里面有我们高中学的排列组合规律。
给大家拿一个雅思真题的答案给大家看看排列组合规律是如何体现的?
在剑桥雅思真题6中的第四个测试第二个section中的11-13题
通过题目我们可以看的到,这是一个配对题
题目如下:
Questions 11-13
Which team will do each of the following jobs?
Choose THREE answers from the box and write the correct letter, A-D, next to questions 11-13.
A. the blue team
B. the yellow team
C. the green team
D. the red team
11. checking entrance tickets _______
12. preparing refreshments _________
13. directing car-park traffic _________
我们从题目中可以看到,这个题是从四个里面选出三个来,而且肯定不可以有重复的选项出现,也就是每个选项只能用一次。在看完选项之后,我们应该把视线锁定在题目上,大家知道雅思听力是按照题目的顺序播放的,我们看一下听力中红黄蓝绿四个队出现的顺序,然后在去看答案,就会发现有很有意思的排列组合规律了。
首先出来的是red team,后面补充说weve also put the entrance staff on the red team and youll be stamping the entrance tickets.
然后出现的是yellow team,后面补充说distributing tickets and staffing the information booths around the conference centre.
又出现blue team,前面说到chefs among you and the kitchen hands.
最后出现green team,后面补充到monitoring and directing the traffic in the car parks.
根据听力,我们知道队伍在听力中的顺序是:红、黄、蓝、绿
先说下这道题的正确答案:11. 红 12. 蓝 13. 绿
红黄蓝绿对应下面三个空格,可以出现的情况有下列几种:
PLAN A:
11. RED
12. YELLOW
13. BLUE
正确率:33.33%
PLAN B:
11. RED
12. YELLOW
13. GREEN
正确率:66.67%
PLAN C:
11. RED
12. BLUE
13. GREEN
正确率:100%
PLAN D:
11. YELLOW
12. BLUE
13. GREEN
正确率:66.67%
根据这几种情况我们可以看的出,三道题目全部答错的概率是0,只答对一道题目的概率是25%,答对两道以上题目的概率是75%。所以你即使完全听不懂的话,你也至少可以答对一个题(前提是你要去听,至少能听懂红黄蓝绿,并且懂得雅思题目是遵循顺序原则的)。
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