参考答案
1-5 CBDBA
6-10 CCCAA
11-15 ABBAB
16-20 BACAB
21-25 CBAEC
26-30 BADCF
31-35 CACAB
36-40 DDACA
41-45 DCBDD
46-50 FADCE
51-55 DCABC
56-60 ACDBD
61-65 CBAAD
