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  3. Members of the San, a hunter-gatherer society, have a diet far richer in fruits and vegetables and lower in salt than is typical

Members of the San, a hunter-gatherer society, have a diet far richer in fruits and vegetables and lower in salt than is typical

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问题     Members of the San, a hunter-gatherer society, have a diet far richer in fruits and vegetables and lower in salt than is typical in industrialized societies. They also differ from industrialized societies in that they have extremely low rates of high blood pressure and obesity. However, contrary to what some have claimed, if people in industrialized societies adopted the San’s diet, the incidence of high blood pressure and obesity in these societies might not be dramatically reduced, because________.
    Which of the following most logically completes the passage?
选项 A、psychological stress, which can also cause high blood pressure, occurs in both industrialized and nonindustrialized societies
B、the San’s low-salt diet is due, not to preference, but to the limited availability of salt in their region
C、a few members of the San have been found to suffer from circulatory system ailments other than high blood pressure
D、members of the San are far more physically active than are most members of industrialized societies
E、not all individuals with high blood pressure are obese
答案D
解析 D选项说明，San的成员之所以健康，是因为体力劳动多，而不仅仅因为饮食健康，可以解释为什么工业社会采取了San的饮食习惯后依然没有变得更健康，正确。A项无法说明为什么非工业社会的高血压和肥胖症发病率低，不选。B项San的成员为什么少吃盐与本文无关，不选。C项本文讨论的疾病仅限于高血压和肥胖症，与循环系统疾病无关。E项高血压患者是否同时患有肥胖症与本文无关，不选。
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