“智力测试”?英语高手来,

题目

“智力测试”?英语高手来,
1.Why is the letter "A" like 12 o'clock?Because it is in the middle of ____.
2.If two cats are in front of a cat,and two cats are behind a catmand one cat is in the middle,how many cats are thererein all?There are ____.
3.What has a bed but never sleeos?It's ____.
4.What number comes next in the following series?9,12,21,48,____.
5.There are 49birds and hares.A bird has two legs and a hare has four.There are 100legs in all.So there are ____ bird has two legs and a hare has four.There are 100legs in all.So there are ____bird(s) and ____hare(s).

答案

1 day a在一天中中间
2,3 cats
3 river 河床不睡觉,（当然也有牙床,这题出得很委琐）
4,129
9+3^1=12
12+3^2=21
21+3^3=48
48+3^4=129
5,48,1 (100-49*2)/(4-2)=1(小学算法)