问答题

Why people in the mountainous regions live longer Study the following table carefully and write an article based on the information given below.
Investigation

Area	Investigated	Celebrate 100th birthday
The mountainous regions	100 000	50
The large cities	100 000	3

注：表中的数字为被调查人数
Outline
(1)调查结果：山区人长寿。
(2)原因：①辛勤的体力劳动
②良好的生活习惯
③无污染的环境
④没有城市的压力