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? One could conclude from this passage that______
A、dieting is not a healthy practice
B、everyone diets
C、there is only one good way to lose weight
D、dieting can be confusing
【正确答案】：D
【题目解析】：文章中提到美国人似乎总是在进行各种各样奇怪的节食，市场上有很多节食计划，很难知道哪些真的有效，关于节食的说法也很多且令人困惑，比如吃芹菜越多会减重越多，土豆其实并不像人们认为的那样会致胖，甚至有人会担心舔邮票会发胖等。这些都表明了关于节食存在很多让人迷惑的信息和观点。所以可以得出节食可能会让人感到困惑，D 选项正确；A 选项节食不是健康的做法文章未提及；B 选项说每个人都节食过于绝对；C 选项说只有一种好的减肥方法文章也没有体现。因此，正确答案是 D。