1. What color is the wind? （风是什么颜色?）

 2. Why is the library the highest building?（ 为什么说图书馆是最高的建筑?）

3. What always goes up and never goes down? （什么东西只升不降?）

4. Why did the boy make his dog sit in the sun? （男孩为什么让他的狗坐在阳光下?）

5. What is the difference between the North Pole and the South Pole? （北极与南极的区别是什么?）