参考答案
1-5 BABCC 6-10 BBACB 11-15 CCBCC 16-20 BBBCA 21-25 BCACA 26-30 CAABC 31-35 CCACB 36-40 ACABB 41-45 CBCCA 45-50 BABBC 51-55 BCCBC
