问题：
[单选题] Which of the following statements is true according to the passage?
参考答案：
B
● 参考解析
【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。
【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。
