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参考答案
21-25 ABCBA       26-30 BDDAC       31-35 AADBB       36-40 DBCAB
41-45 CDBCA       46-50 BADCD       51-55 ADCAB       56-60 BCBAC
61-65 CABAA       66-70 DBCBA       71-75 CC DDB
76. happened 前加that 或 which     77.正确     78. the改为 a
79. has 改为was     80. surprises 改为surprise     81. 去掉when
82. Saw 改为Seeing     83. his改为 her     84. to改为 at
85. quick 改为quickly

One possible version:
Senior Grade III Class 10
Fengtai No. One Middle School
Huainan City
Anhui Province
May 5th, 2005/
Dear editor,
    Last year I wrote you a letter (published in your paper)about serious pollution in