答案
1---5 BBABC 6---10 CACBD 11---15 BDDCB 16---20 BCABA
21---25 BCBDC 26—30 BDCCC 31—35 BADBD 36---40 BABAC
41---45 CBCAA 46---50 CBDAD 51---55 ACBBB 56---60 BCCCC
61---65 BBBAA 66---70 BAAAD 71---75 DBCCD 76---80 DDBCA
81---85 BABBD 86---90 BABAD 91---95 BCADA 96----100 DDDAC
