Which is the main cause of obesity according to the passage?
A.Less physical exercises.
B.Oversleeping.
C.Irrational composition of our diet.
D.Ageing.

A.Less
B.
B.Oversleeping.
C.Irrational
C.
D.Ageing.

【参考答案】

C
解析：由于A、B和D文章中没有提到，所以C对。