About 70，000，000 Americans are trying to lose weight．This is almost one out of every three people in the United States．Some people eat 1food and they hardly have any fats or sweets. Others do running exercise with machines，take medicines，or even have operations2you can see losing weight is 3 work，and it will also cost a lot of money．But 4do so many people in the United States want to lose weight?
    Many people in the United States worry about their look of the body．For many people，looking nice also means to be 5．Other people worry about their health as many doctors 6 overweight is not good．
    Most people want to find a faster and 7 way to take off fat，and books of this kind are very popular．These books tell people how to lose weight．Each year a lot of new books like these are 8．Each one says it can easily help people take fat away．
    Losing weight can be expensive．Some overweight people go to health centers，like La Costa in California．Men and women9several hundred dollars a day at these health centers．People live there for one week or two，taking exercise，eating different foods．Meals there may be just a little．All this works for losing weight．104 days on the program，one woman called Mrs. Warren lost 5 pounds(2.27kg)．At 400 dollars a day, she spent 320dollars to lose each pound．But she said she was still glad to do so．
    Health centers，books，medicines，operations，running and exercise machines all get a lot of money．So in the United States，losing weight may mean losing money too.

①强强联手力量大，一切竞争皆可抛     ②竞争必然遭失败，合作方能得双赢

③一人逞强势孤单，众人拾柴火焰高     ④合作拧成一股绳，竞争激发昂扬志

当今世界，各国之间激烈的经济竞争和科技竞争，归根结底是 （）