Passage Three Americans are well known for the strange diets th

Passage Three Americans are well known for the strange diets they always seem to be following．It seems that Americans like to diet almost as much as they like to eat．New types of diet plans are always coming out．Usually,though,they don't stay popular for long． There are many diets on the market．It is often difficult to know which ones really work．It's also hard to believe how fast a dieter is supposed to shed pounds．A lot has been written about dieting．And some interesting facts about diets and foods have been discovered． For example,did you know that the more celery you eat,the more weight you will lose?Celery has“negative”calories．The body burns up more calories digesting a piece of celery than there are in the celery stick itself． Dieters?shun?potatoes because they think they are fattening．But they aren't．A potato has about the same number of calories as an apple．To gain a single pound,you would have to eat eleven pounds of potatoes! Some dieters even worry about getting fat from licking postage stamps．But they have nothing to worry about．The glue on an average stamp has only about one-tenth of a calorie．Maybe a diet of post-age stamps would be popular? Celery is a good food for the dieter because______
A、it has a lot of protein
B、vegetables are not fattening
C、it has“negative”calories
D、it is easy to digest
【正确答案】：C
【题目解析】：在这篇文章中，提到了美国人对于饮食和减肥的热衷，以及市场上众多的减肥食谱。文章特别提到了芹菜（celery）作为一种对减肥有益的食物，因为它具有“负”热量（negative calories）。具体来说，人体消化芹菜所需的热量超过了芹菜本身所含的热量。 现在我们来分析选项： A. 它有很多蛋白质（it has a lot of protein）：文章中并没有提到芹菜含有大量蛋白质。 B. 蔬菜不增肥（vegetables are not fattening）：虽然蔬菜通常不增肥，但这不是文章特别强调芹菜作为减肥食物的原因。 C. 它有“负”热量（it has“negative”calories）：这与文章中关于芹菜的内容完全一致。 D. 它易于消化（it is easy to digest）：文章中并没有提到芹菜易于消化。 因此，根据文章内容，正确答案是C，即芹菜是减肥者的好食物，因为它具有“负”热量。