题目

如图所示，在绝缘的斜面上方，存在着匀强电场，电场方向平行于斜面向上，斜面上的带电金属块在平行于斜面的力F作用下沿斜面移动。已知金属块在移动的过程中，力F做功32J，金属块克服电场力做功8J，金属块克服摩擦力做功16J，重力势能增加18J，则在此过程中金属块的（ ）A. 动能减少10J B. 电势能增加24JC. 机械能减少24J． D. 内能增加16J20、In England breakfast is a big meal—eggs, tomatoes, tea, coffee. For many people, lunch is just a quick meal. In cities there are a lot of sandwich bars. There, office workers can buy their favorite bread and all kinds of sandwiches. Children in school can have a hot meal at school, but many just have a sandwich, some water and some fruit from home. Some people have afternoon tea in the afternoon. They usually have sandwiches, cakes and drink a cup of tea. They have the evening meal quite early and all the family often eats together. On Sundays many families have a traditional lunch. They have chicken, pork and vegetables. Englishmen like food better than other countries. People often get take-away meals. They buy the food outside and then usually bring it home to eat.  1. Many people in England have a         breakfast and a        lunch. A. fast, small               B. little, slow           C. big, quick        D. slow, big 2. In England, there are many sandwiches bars in        . A. small towns            B. villages                C. countries         D. cities 3. The office workers can buy         in sandwiches bars for lunch. A. eggs                       B. bread                  C. fruit                D. tea 4. When people get a take-away meal, they usually eat it        . A. at home                  B. in the school        C. outside            D. in the bars 5. In this passage, what don’t people have in their afternoon tea?           A. Sandwiches.           B. Chicken.             C. Cakes.             D. A cup of tea.