内容正文:
参考答案: 1-5:ACAAA 6-10:ABCBB 11-15:BAACB 16-20:BCACC 21-25:BDCAA 26-30:ABDBA 31-35:ABCDC 36-40:DBFGA 41-45:ADBCB 46-50:DACBA 51-55:AADCD 56-60:DACDB 61:Dating 62:as 63: when 64:into 65: prefers 66: could 67: historic 68:was introduced 69: a 70It 三,写作:略 $$