.  America is changing its eating habits. Though medical evidence mounts that we are     1    what we eat, consuming a healthier diet has become almost a national passion in the United States.
    The food-for-fitness phenomenon began in the late 70's when a U.S. Senate committee leading     2    the conclusion that six out of ten leading causes of death such as heart disease and cancer might     3    diet. The government issued dietary guidelines     4    Americans to eat a variety of food, maintain proper weight, and limit intake of fat, salt, and sugar.
    For most Americans what to eat is a matter of personal choice,     5    one of supply. An excellent nationwide food distribution system assures that fresh     6    is readily available in all parts of the country,     7    the season. Taking advantage of this abundance, many people are forsaking traditional meat-and-potatoes fare     8    lighter meals of salads, fruits, and vegetables.
    One of the most significant trends in the American way of eating is the healthful change in restaurant food. One of     9    two meals in the United States is eaten outside the home.
    Restaurants are making special efforts to provide low-fat, low-salt, and low-calorie items. Salad bars,     10    with fresh greens and raw fruits and vegetables, are found everywhere.1. 
【正确答案】 C
【答案解析】[考点] 本题考查的是固定搭配。
本文介绍了美国人的饮食习惯正在改变,由单一的高热量的饮食方式转向多样化的,低脂肪,低盐,低热量。食品的供应是十分重要的。美国餐馆也致力于提供健康的食品。
   句意:虽然医学实验证明我们对食物很挑剔,但是人们仍然十分热衷健康饮食。此处由though可知,前后半句为转折关系,be exact about是固定搭配,表“对……挑剔”。故选C。
[参考译文] 美国人的饮食习惯正在改变。虽然医学实验证明我们对食物很挑剔,但是人们仍然十分热衷健康饮食。
   健康饮食的现象于七十年代末期就出现了,当时美国参议院委员会得到结论认为,导致心脏病和癌症的主要病因中60%可能与饮食有关。美国政府出台了饮食方针建议美国人饮食要多样化,保持健康的体重,限制脂肪、盐的摄入量。
   大多数美国人认为吃什么是出于个人的选择,而不是由供应商决定的。优秀的全国食品配送系统保证了不管任何季节全国各地都可以买到新鲜的食物。利用这种充足的供应量,许多人放弃了传统的只有肉和土豆的饮食习惯,而更喜欢沙拉、水果和蔬菜一类的轻食。
   美国人饮食最大的趋势是餐馆里的食物越来越健康。美国人一半的饭都是在餐馆里吃的。
   所以餐馆都在努力提供低脂肪、低盐、低热量的食品。装满了绿叶菜、水果或蔬菜的沙拉吧在餐馆随处可见。