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

单选材料题

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

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正确答案：

本题解析：

【答案】B
【解析】根据第三段“Of the women，47％said walking was their only recreational activity．Those who walked for at least seven hourS per week had a 1 4％lower risk of breast cancer compared to those who walked three or fewer hours per week…”可知B选项正确，即散步是大约一半的妇女的唯一的休闲活动。