Igor was both the 15th highest and the 15th lowest in a tennis tournament. How many people were in the tournament?
A:28
B:29
C:30
D:31
E:32
A:28
B:29
C:30
D:31
E:32
答案:B
思路:正数第十五加上倒数第十五个,应该是30个人,但是正数和倒数的第十五名都是一个人,所以,答案应该是29个人。