Which of the following statements is true according to the passage?

A.Most women take walking as their only recreational activity.

B.Walking was the only recreational activity for about half of the women.

C.The study aims to track the health conditions of its subjects.

D.Irregular walking increased the risk of breast cancer in post-menopausal women

城市生产力发展应（）当地现有基础。

A.超越

B.稍滞后

C.相适应

D.没关系