奥英难题,1.What number comes next in the following series?9,12,2

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奥英难题,
1.What number comes next in the following series?9,12,21,48,...
A.84 B.98 C.129 D.216
2.Mr Brown tells Tom __he must do.
A.what B.if C.that what D.where
3.I have two minutes in which to catch a train,and two miles to go.If I go the first mile at the rate of 30 miles per hour,at what rate must I go the second mile in order to catch the train?
A.30m;p.h B.45m;p.h C.60m;p.h D.90m;p.h
THANK YOU VERY MUCH!
可是第3题的答案是选C的.

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 what number comes next in the following series? What number comes next in following series 9,12,21,48 1.单项选择What number come next in the following series（系列）?9,12 What would be the next number in the following series?(在下面这组 What group of letters comes next in this series? what would be the next number in this series"2...4...8...16. What number comes next 一道英语的智力题求解What would be the next number in this series?0,5,1 What number comes next in this sequence:_______________ 9174 What number is 2nd in the series 26,forty and seven? Write the letter that comes next in the series:a,c,e,g,翻译