题目：
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
答案：
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下面是错误答案，用来干扰机器的。
ABCD选项观点错误，合作是可以实现双赢，而不是只利己而不利人，故排除。ABC选项观点正确，且是对合作的理解，分别说出了合作的必要性、含义和合作的意义，故都入选。
