15．Why do Americans struggle with watching their weight，while the French，who consume（消费） rich food，continue to stay thin？Now a research by Cornell University suggests how life style and decisions about eating may affect weight．Researchers concluded that the French tend to stop eating when they feel full．However，Americans tend to stop when their plate is empty or their favorite TV show is over．
According to Dr．Joseph Mercola，a health expert，the French see eating as an important part of their life style．They enjoy food and therefore spend a fairly long time at the table，while Americans see eating as something to be squeezed between the other daily activities．Mercola believes Americans lose the ability to sense when they are actually full．So they keep eating long after the French would have stopped．In addition，he points out that Americans drive to huge supermarkets to buy canned and frozen foods for the week．The French，instead，tend to shop daily，walking to small shops and farmers'markets where they have a choice of fresh fruits，vegetables，and eggs as well as high-quality meats for each meal．
After a visit to the United States，Mireille Guiliano，author of French Women Don't Get Fat，decided to write about the importance of knowing when to stop rather than suggesting how to avoid food．Today she continues to stay slim and rarely goes to the gym．
In spite of all these differences，evidence shows that recent life style changes may be affecting French eating habits．Today the rate of obesity-or extreme overweight-among adults is only 6%．However，as American fast food gains acceptance and the young reject older traditions，the obesity rate among French children has reached 17%-and is growing．
29．In what way are the French different from Americans according to Dr．Joseph Mercola？C
A．They go shopping at supermarkets more frequently．
B．They squeeze eating between the other daily activities．
C．They regard eating as a key part of their lifestyles．
D．They usually eat too much canned and frozen food．
30．This text is mainly the relationship betweenB．
A．Americans and the French
B．life style and obesity（肥胖）
C．children and adults
D．fast food and overweight
31．The text is mainly developedA．
A．by contrast （对比）
B．by space
C．by process
D．by classification
32．Where does this text probably come from？C
A．A TV interview
B．A food advertisement
C．A health report
D．A book review．
分析 主要介绍了美国和法国的生活方式的不同，以及他们的生活方式与肥胖之间的关系．作者以为什么美国人在与肥胖作斗争而法国人享受着美食且保持身材苗条引出话题，并展开讨论．
解答 29．C 细节理解题．根据第二段the French see eating as an important part of their life style可知法国人将饮食当作生活的一部分，故选C．
30．B 主旨要义题．通读全文，并根据Researchers conclude that the French tend to stop eating when they feel full．However，Americans tend to stop when their plate is empty or their favorite TV show is over．可知本文主要介绍了美国和法国的生活方式的不同，而且美国的饮食宜造成肥胖，而法国的饮食可保持身体苗条，也就是主要介绍的生活方式与肥胖之间的关系，故选B．
31．A 判断推理题．通读全文，根据Why do Americans struggle with watching their weight，while the French，who consume rich food，continue to stay thin？作者在第一段以为什么美国人在与肥胖作斗争而法国人享受着美食且保持身材苗条引出话题，故选A．
32．C 判断推理题．本文主要介绍了美国和法国生活方式的不同以及带来的体型变化等，故应是来源于健康报告．故选C．
点评 在阅读时要抓住文章的主题和细节，分析文章结构，根据上下文内在联系，挖掘文章的深层含义，对于暗含在文章中的人物的行为动机，事件中的因果关系及作者未言明的倾向、意图、态度、观点等要进行合乎逻辑的判断、推理、分析，进一步增强理解能力，抓住材料实质性的东西．
