61. What has cities with no houses, rivers without water and forests without trees?
A map. 
62. What can be measured but has no length, width or thickness?
The temperature.
63. What makes the Tower of Pisa lean?
It never eats.             谜语大全及答案
64. Why is writing called handwriting?
If people wrote with their feet, we would have to call it footwriting.
65. If there were only thre girls in the world, what do you think they would do?
Two of them would get together ans talk about the other one.