1.21 2.20 3.19 4.18 5.17 6.16 7.15 8.14 9.13 10.12 11.11 12.10 13.9 14.8 15.7 16.6 17.5 18.4 19.3 20.2 21.1 22.00 00.22望采纳，慢慢数吧
23
