答案：
Unit1 Topic1
1-5 CBACA      6-10 DBBCB        11-15 ABDAC       16-20 BDBCD
Topic2
1-5 BACAC      6-10 DCBCD        11-15 ABDCB       16-21 DADDAC
Topic3
1-5 CBCCB      6-10 ABBBC         11-15 BCBDA       16-20 DBBDC
Unit2 Topic1
1-5 DACDD      6-10 ABCBC         11-15 DDBDB      16-19 ADCC

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