【正确答案】
C
【答案解析】[听力原文] Many, if not most, people start exercising because they want to lose weight. But very often they abandon exercise when the expected pounds fail to fall off. Study after study has found that, without major changes in eating habits increasing physical activity is only somewhat effective for losing weight. Though it helps people maintain weight loss. And shedding even a few pounds, especially around one's middle, can improve health. For example, researchers in Brisbane, Australia, studied 58 sedentary overweight or obese men and women who participated in a closely monitored 12-week aerobic exercise program. Weight loss was minimal, but nonetheless the participants' waistlines shrunk, their blood pressure and resting heart rate dropped, and their aerobic capacity and mood improved. Exercise should be encouraged and the emphasis on weight loss reduced, the researchers concluded. 'Disappointment and low self-esteem associated with poor weight loss could lead to low exercise adherence and a general perception that exercise is futile and not beneficial.' I walk three miles daily, or bike ten miles and swim three-quarters of a mile. If you ask me why, weight control may be my first answer, followed by a desire to live long and well. But that's not what gets me out of bed before dawn to join friends on a morning walk and then bike for my swim. It's how these activities make me feel: more energized, less stressed, more productive, more engaged and, yes, happier—better able to smell the roses and cope with the inevitable frustrations of daily life. According to the research findings on exercise what can you achieve from increasing physical activity? 推断题。从短文开头“...increasing physical activity is only somewhat effective for losing weight. Though it helps people maintain weight loss. And shedding even a few pounds, especially around one's middle, can improve health.”可知，增加体育锻炼只能一定程度减重，并非一直有效，体育锻炼有助于维持体重的减少，也对健康有益。文中没有提及胃口和健脑，故选C。