About 70 million Americans are trying to lose weight. This is almost one out of （21）threepeople in the United States. Some people go on diets (节食). This （22） they eat less of certainfoods, especially fats and sugars.（23）people exercise with special equipment, take medicine, （24）even have surgery (手术). Losing weight is hard work, and it can also cost a lot of money. So （25）do so many people in the United States want to lose weight? Many people in the UnitedStates are （26）for looking young and pleasant. To many people,（27）good means being thin.
Other people worry about their （28）. Many doctors say being overweight is unhealthy. But areAmericans really （29）?
Almost （30）million Americans weigh at least 20 percent 30than their proper weight.
（31）,the United States is the most overweight country in the world. "The stored （32）of adultAmericans weight 2,300 million pounds," said an American scientist. He said （33）off that stored energy would produce enough power for 900,000 cars to go 12,000 miles.（34）losing weight ishard work, many people want to find a fast and easy （35）to take off fat.
3. 第（24）题选（）。
Aor
Bthat
Cwhich
Duntil
