51.答案:ABCD52.答案:DE53.答案:ACD54.答案:BC55.答案:AB
56.答案:BCE57.答案:BDE58.答案:ACE59.答案:BCDE60.答案:BCE
61.答案:CDE62.答案:CD63.答案:ACE64.答案:BDE65.答案:ACDE
66.答案:ABE 67.答案:BCD68.答案:BCDE69.答案:ACDE70.答案:AC
71.答案:ABCD72.答案:ABD73.答案:BCD74.答案:BE75.答案:ABCD
76.答案:AD77.答案:CD78.答案:BC79.答案:ABDE80.答案:ABCD