He spoke so quickly that I did not（）what he said.
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 (節食). This （22） they eat less of certainfoods, especially fats and sugars.（23）people exercise with special equipment, take medicine, （24）even have surgery (手術). 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.
When did you last see a polar bear? On a trip to a zoo ,perhaps? If you had attended a winter activity in New York a few years ago, you would have seen a whole polar bear club. These" Polar Bears" are people who-meet frequently in winter to swim in freezing cold water. That day, the air temperature was 3oC,and the water temperature was a bit higher. The members of the Polar Bear Club at Coney Island, New York are usually about the age of 60. Members must satisfy two requirements. First, they must get along well with everyone else in the group. This is very important because there are so many different kinds of people in the club. Polar Bears must also agree to swim outdoors at least twice a month from November through February.
Doctors do not agree about the medical effects of cold-water swimming. Some are worried about the dangers of a condition in which the body′ s temperature drops so low that finally the heart stops. Other doctors, however, point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.
The Polar Bears themselves are satisfied with the benefits (or advantages)of cold-water swimming. They say that their favorite form of exercise is very good for the circulatory system(循環系統) because it forces the blood to move fast to keep the body warm. Cold-water swimmers usually turn bright red after a few minutes in the water. A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.
The main benefits( or advantages)of cold-water swimming are probably mental. The Polar Bears love to swim year-round; they find it fun and relaxing. As one 70-year-old woman says,"When I go into the water, I pour my troubles into the ocean and let them float away. "
Linda:Hello ! This is Linda speaking.
Chris:Hello,Linda, this is Chris.__51__this Friday evening?
Chris:There’s a good concert, and I’ve got two tickets. I wonder__52__
Linda:That’s great !__53__?
Chris:7o’clock. But how about__54__at 6:45?
Linda:OK.I think I can make it.
Chris:After the concert,__55__, shall we?
Linda:Wonderful!Why don’t we go to a Chinese restaurant?
Chris:Why not? OK ,see you Friday.
Linda:See you then. Bye ！