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。
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 _______
首先出来的是red team,后面补充说we've also put the entrance staff on the red team and you'll 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.
12. YELLOW(wrong)
13. BLUE(wrong)
正确率：33.33%
PLAN B:
13. GREEN
正确率：66.67%
PLAN C:
11. RED
PLAN D:
11. YELLOW(wrong)
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)。
