单选题   Are you diligently exercising but seeing no results around your midsection (上腹部)? It's not just you.
    Two new studies may explain why many people who begin exercise programs often lose little to no weight in the long run.
    In the first study, published in the online science journal PLoS One, researchers compared the daily energy expenditures of Westerners and the Hadza, a population of hunter-gatherers living in northern Tanzania. Many believe modem Westerners burn fewer calories than in the past because their lives have become more sedentary (久坐的). The Hadza, who are generally very lean, hunt and look for food without modem tools such as vehicles or guns. Men walk about seven miles each day, while women walk about half that.
    What was surprising was that although the Hadza seem to be more active, the researchers found little difference in calories burned between the Hadza and the Westerners.
    The second study, published in Obesity Reviews, analyzed the effect of exercise interventions on body composition. The researchers found that—contrary to popular belief—when people exercise but keep their energy intake constant, their resting metabolic (新陈代谢的) rate actually goes down. Exercisers who ate more calories than they usually do did burn more fat than predicted, but some overate and negated the effects of their hard work.
    These studies suggest two things: exercise programs may not lead to as much calorie bum as you would think, and many people start eating more when they exercise, and they may eat too much.
    Bottom line, if you start exercising to lose weight, you won't succeed with the mentality of 'I can eat anything because I'll burn it off later.' You will have better results if you choose a healthy diet of whole grains, fruits and vegetables, lean proteins and healthy fats while exercising. Although these two studies show that diet may be more important than exercise for weight loss, don't discount the other benefits of exercise, including decreased stress and anxiety, improved mood and reduced risk of cardiovascular (心血管的) disease, diabetes (糖尿病) and some cancers.
单选题     what do we know about the Hadza? ______
 
【正确答案】 B
【答案解析】本文通过分析两项研究结果，指出运动并不能燃烧运动者预期的那么多热量。当很多人开始锻炼的时候，他们会吃得更多，而有些人或许会吃得过多。因此，要想达到减肥的目的，在锻炼的同时必须保持健康饮食，效果可能会更好。 细节理解题。根据题干中的the Hadza定位到原文第三段。该段提到，哈扎人是生活在坦桑尼亚北部的采集狩猎民族，他们普遍都很瘦，狩猎和寻找食物时也没有车和枪等现代工具。哈扎男人每天大约行走7英里路，而女人走的路程大概是男人的一半。因而排除A、C、D三项。
单选题     What was the result of the first study? ______
 
【正确答案】 C
【答案解析】细节理解题。由题干中的result of the first study定位到文章第四段。该段提到，令人惊讶的是，尽管哈扎人看起来更加活跃，但是研究人员发现他们燃烧的热量和西方人燃烧的热量并没有大的差别。四个选项中只有C项符合原文。
单选题     What does the word 'negated' (Para. 5) mean? ______
 
【正确答案】 A
【答案解析】语义理解题。negated一词位于整个句子的后半句。该分句由but引导，表示句子前后两部分意义上的转折。前半句中提到，摄入热量比平时多的锻炼者的确会燃烧比预计的更多的脂肪，因而可以推知negated应该表示消极意义。所在分句表达的应该是：但是一些人进食过多，从而导致他们的努力锻炼没有效果。四个选项中只有denied“否定”符合句意。
单选题     What do the two studies show? ______
 
【正确答案】 D
【答案解析】细节理解题。由题干中的two studies show定位到原文第六段。该段提到，这些研究说明两点，即运动计划可能并不能燃烧像你预计的那么多的热量；当很多人开始锻炼的时候，他们会吃得更多，而有些人或许会吃得过多。由此可以推知，运动并不一定会导致体重减轻，故选D。
单选题     What's the best way to lose weight according to the author? ______
 
【正确答案】 C
【答案解析】推理判断题。由题干中的the best way和according to the author定位到原文最后一段。该段第二句提到，如果你在锻炼的同时保持健康饮食：摄取全谷类食物、水果、蔬菜、瘦肉蛋白和健康脂肪，效果可能会更好。由此可以推知，作者认为在锻炼的同时保持健康饮食更加有利于减肥。