In 1955, a man named Raymond Kroc entered a partnership with two brothers named McDonald. They opened a popular restaurant in California which sold food that was easy to prepare and serve quickly. Hamburgers, French fries, and cold drinks were the main food there. Kroc opened similar eating places under the same name, "McDonald's", and they were an instant success. He later took over the company, and today it is one of the most famous and successful "fast-food" in America and the world. Why was his idea so successful？ Probably the most important reason was that this timing was right. In the 1950s, most married women stayed home to keep house and take care of their children. In the 1960s, many women returned to the workplace. This meant they had less time and energy to do housework and preparation of meals, so they relied more on "TV dinners" and fast-food restaurant. Single parents also have little time to spend in the kitchen. People living alone also depend on this type of food, since cooking for one is often more trouble than it is worth.Fast-food is not part of the diet of all Americans. Another trend of the 1960s, sometimes called the back-to-nature movement influenced many people to avoid food that was packaged or processed(处理). This preference for natural food continued to this day.From the success of Raymond Kroc’s fast-food business, we can say that social economic trends influence where and what we eat.1.The main idea of the reading is that ().A、Raymond Kroc is the most successful fast-food business owner in the worldB、social and economic changes affect eating habitsC、fast-food is easy to prepare and serve quicklyD、Americans eat either fast food or natural food2.Why was McDonald''s idea so successful？ It was mainly because ().A、people living alone depend on fast foodB、single parents have little time to spend in the kitchenC、many women returned to the workplace in 1960sD、his timing was right3.Americans had the "movements"().A、in 1955B、in 1950sC、in 1960sD、both in 1950s and 1960s4."Cooking for one is more trouble than it is worth" means ().A、cooking for several people is worth more moneyB、it is not necessary to take too much time to cook for one personC、there are more problems when one person cooksD、there are a lot of housework and preparation to do when one person cooks5.An idea implied but not directly stated (陈述) in the reading is that ().A、many married women began to work in the 1960sB、natural foods are still popular todayC、fast food is not part of the diet of all AmericansD、divorce causes people to change their eating habits