![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Q4 What is the main idea of the passage?
A.
Diet and lifestyle are crucial to good health
B.
Good air quality is the key to living a long life
C.
Genetic factors have much to do with good health
D.
Climate conditions have little impact on one’s life span( 寿命 )