第一题 c 9+3=12 12+9=21 21+27=48 每次所加的数依次是3的n次方,n可为1,2,3等
第二题 选A 此为宾语从句．
第三题 选A 前一分钟用的速度应和后一分钟用的
是一样的.
奥英难题,1.What number comes next in the following series?9,12,2
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