第9题: [单项选择]12,23,35,47,( )。 A. 74 B. 61 C. 56 D. 82 参考答案:B 答案解析:[解析] 12=10+2,23=20+3,35=30+5,47=40+7,注意:2,3,5,7,( )为质数数列;10,20,30,40,( )为等差数列,则该数列的空缺项应为50+11=61。因
第20题: [单项选择]This job (), who are more careful. A. is done traditionally by women B. traditionally is done by women C. is traditionally done by women D. is done by women traditionally 参考答案:C 答案解析: