7．We can conclude from the text that ________.

　　A．the fat in mice's belly was reduced because of the relaxing environment

　　B．a sedentary lifestyle and high calories foods influence people's social life

　　C．surfing the Internet may influence people's face­to­face communication

　　D．cancer and death are mainly caused for lack of social life

　　答案：C　推理判断题。根据最后一段第二句 “Explaining how new technology had threatened face­to­face 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C正确。

　　8．What's the main idea of the text?

　　A． Brown fat is beneficial to people's health.

　　B. Socializing is unnecessarily important in people's daily life.

　　C． White fat can be changed into brown fat.

　　D. Socializing contributes to people's losing weight.

　　答案：D　主旨大意题。根据文章第一段得出，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。选D。

　　Ⅱ.七选五

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