第三部分 概括大意与完成句子概括大意部分四种方法找到段落主题句:lHeartbeat of America1. New York - the Statue of Liberty1, the skyscrapers, the beautiful shops on Fifth Avenue2 and the many theaters on Broadway3. This is Americas cultural capital. It is also her biggest city, with a population of nearly 8 million. In the summer it is hot, hot, hot and in the winter it can be very cold. Still there are hundreds of things to do and see all the year round.2. Manhattan is the real center of the city. When people say New York City, they usually mean Manhattan. Most of the interesting shops, buildings and museums are here. In addition, Manhattan is the scene of New Yorks busy night life. In 1605 the first Europeans came to Manhattan from Holland. They bought the island from the Native Americans for a few glass necklaces worth about $26 today.3. Wall Street in Manhattan is the financial heart of the USA. It is also the most important banking center in the world. It is a street of skyscrapers. These are those incredible, high buildings, which Americans invented, and built faster and higher than anyone else. Perhaps the two most spectacular skyscrapers in New York are the two towers of the New York World Trade Center4. When the sun sets, their 110 floors shine like pure gold. 4. Like every big city, New York has its own traffic system. Traffic jams can be terrible. Its usually quickest to go by subway. The New York subway is easy to use and quite cheap. The subway goes to almost every corner of Manhattan. But it is not safe to take the subway late at night because in some places you could get robbed. New York buses are also easy to use. You see more if you go by bus. There are more than 30,000 taxis in New York. They are easy to see, because they are bright yellow and carry large TAXI signs. Taxis do not go outside the city. However, they will go to the airports. In addition to the taxi fare, people give the taxi driver a tip of 15 percent of the fares value. 5. Central Park is a beautiful green oasis in the middle of New Yorks concrete desert. It is surprisingly big, with lakes and woods, as well as organized recreation areas. New Yorkers love Central Park, and they use it all the time. In the winter, they go ice-skating, and in the summer roller-skating. They play ball, ride horses and have picnics. They go bicycling and boating. There is even a childrens zoo, with wild birds and animals.6. Along the east side of Central Park runs Fifth Avenue, once called Millionaires Row. In the 19th century, the richest men in America built their magnificent homes here. It is still the most fashionable street in the city, with famous department stores.7. Broadway is the street where you will find New Yorks best-known theaters. But away from the bright lights and elegant clothes of Broadway are many smaller theaters. Their plays are called off-Broad-way and are often more unusual than the Broadway shows. As well as many theaters, New York has a famous opera house. This is the Metropolitan5, where international stars sing from September until April. Carnegie Hall6 is the citys more popular concert hall. But night life in New York offers more than classical music and theater. There are hundreds of nightclubs where people go to eat and dance.l Why Does Food Cost So Much? Vegetables and chicken cost more when they have been cut into pieces by someone other than the one who buys it, A family should expect to pay more when several TV dinners are taken home from the store. These are fully cooked meals, consisting of meat, vegetables and sometimes desert, all arranged on a metal dish. The dish is put into the oven and heated white the housewife is doing something else. Such a convenience costs money. Thus, as economists point out: Some of the basic reasons for widening food price spreads are easily traceable to the increasing use of convenience foods, which transfer much of the time and work of meal preparation from the kitchen to the food processors plant.Transport and TradeTransport also prevents waste. Much of the fish landed at the ports would be wasted if it could not be taken quickly to inland towns. Transport has given us a much greater variety of foods and goods since we no longer have to live on4 what is produced locally. Foods which at one time could be obtained only during a part of the year can now be obtained all through the year. Transport has raised the standard of living.l Why Does Food Cost So Much? Who then is actually responsible for the size of the bill a housewife must pay before she carries the food home from the store? The economists at First National City Bank have an answer to give housewives, but many people will not like it. These economists blame the housewife herself for the jump in food prices. They say that food costs more now because women dont want to spend much time in the kitchen. Women prefer to buy food which has