阅读理解。 All of us eat every day, but most of us don't understand the study nutrition(营养).We often make mistakes in talking about how to keep a good diet. For example, many people think that food such as rice, bread, and potatoes will make one fat, this kind of food is very good for one's health. It's good source of many vitamins and it contains less amount of calories. Some people don't like frozen vegetables, because they think fresh vegetables cooked at home are always better. This is wrong again. In fact, whether the vegetables are good or not depends more on how they prepared. Overcooking, for example, destroys many good qualities of vegetables. Vegetables cooked in too much water can lose a deal of vitamins. It is also wrong to say that vegetables grown in poor, worn-out soil are lower in vitamins than vegetables grown in rich soil. The vitamins are in the plants themselves. They don't come from the soil. However the minerals(矿物质)in a plant depend on the minerals in the soil. In short, there are many wrong ideas about nutrition. We need to correct them. 1. The passage is mainly about ______ . A. nutrition B. vitamins C. vegetables D. health 2. Rice, bread and potatoes are good for people's health mainly because ______. A. they make people fat B. there are a lot of vitamins in them C. they contain more calories D. they give people more heat 3. Why don't some people like frozen vegetables? A. They think fresh vegetables contain fewer vitamins B. They think fresh vegetables contain a lot of vitamins C. They don't think the frozen vegetables are flesh D. They don't think the frozen vegetables taste as good as the fresh ones. 4. Which of the following is true according to the passage? A. Many people know almost everything about nutrition. B. Food such as rice, bread, and potatoes make people fat. C. The minerals in a plant do not come from the soil D. Vegetables grown in poor soil may have the same amount of vitamins as those grown in rich. 5. In this passage the writer wants to tell us that ______. A. people should correct wrong ideas about good diet B. vegetables should be cooked in too much water C. why people don't like frozen vegetables D. rice, bread and potatoes can make people fat