分析 本文講述了一項關于減肥的研究.以小老鼠的例子告訴人們應該積極參加社交活動多鍛煉,而不是總待著不動.研究人員表示,社交活動和朋友聚會能幫助提高體內"棕色脂肪"的含量,這種脂肪可以燃燒卡路里,產生熱量,從而有助于減肥.
解答 67.D 細節理解題.根據第二段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.可知美國研究者認為社交興奮感可以把"白色脂肪"轉化為"棕色脂肪",從而有助于減肥."白色脂肪"儲存卡路里,使人們長胖,而"棕色脂肪"能夠燃燒能量,產生熱量.故選D.
68.A 細節理解題.根據第二段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"變成"棕色脂肪"是非常困難的,通常需要長期呆在寒冷的條件下或神經系統處于興奮狀態.由此推知,棕色脂肪的含量可以通過社交來增加.故選A.
69.C 推理判斷題.根據最后一段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.可知上網可能會影響人們的面對面交流.故選C.
70.D 主旨大意題.根據第一段可知科學家研究發現,與在跑步機上鍛煉幾個小時相比,跟朋友一起參加社交活動更有利于保持苗條身材.研究人員表示,社交活動和朋友聚會能幫助提高體內"棕色脂肪"的含量,這種脂肪可以燃燒卡路里,產生熱量.所以有助于減肥.故選D.
點評 本文考察學生的理解推斷能力以及細心程度,只要抓住文章的關鍵詞,采用尋讀的方法查找細節,就能找到正確答案.
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