分析 本文讲述了一项关于减肥的研究.以小老鼠的例子告诉人们应该积极参加社交活动多锻炼,而不是总待着不动.研究人员表示,社交活动和朋友聚会能帮助提高体内"棕色脂肪"的含量,这种脂肪可以燃烧卡路里,产生热量,从而有助于减肥.
解答 67.D 细节理解题.根据第二段US researchers say that social excitement aids weight loss by turning white fat into brown.White fat stores calories and makes us fatter,while brown burns energy to produce heat.可知美国研究者认为社交兴奋感可以把"白色脂肪"转化为"棕色脂肪",从而有助于减肥."白色脂肪"储存卡路里,使人们长胖,而"棕色脂肪"能够燃烧能量,产生热量.故选D.
68.A 细节理解题.根据第二段Turning white fat into brown is extremely difficult,normally requiring long-term stay in cold conditions or exciting part of the body's nervous system.可知把"白色脂肪"变成"棕色脂肪"是非常困难的,通常需要长期呆在寒冷的条件下或神经系统处于兴奋状态.由此推知,棕色脂肪的含量可以通过社交来增加.故选A.
69.C 推理判断题.根据最后一段Explaining how new technology had threatened face-to-face socializing,he added,"It's not just a sedentary(久坐的) lifestyle and high calorie foods,but an increasing lack of social activities.可知上网可能会影响人们的面对面交流.故选C.
70.D 主旨大意题.根据第一段可知科学家研究发现,与在跑步机上锻炼几个小时相比,跟朋友一起参加社交活动更有利于保持苗条身材.研究人员表示,社交活动和朋友聚会能帮助提高体内"棕色脂肪"的含量,这种脂肪可以燃烧卡路里,产生热量.所以有助于减肥.故选D.
点评 本文考察学生的理解推断能力以及细心程度,只要抓住文章的关键词,采用寻读的方法查找细节,就能找到正确答案.
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