题目

关于物体的内能，下列说法正确的是（? ）A. 相同物态下，同一物体温度降低，内能会减少B. 物体内能增加，一定从外界吸收了热量C. 温度为0℃的物体没有内能D. 等质量30℃的水比20℃的水所含热量多 答案：【答案】A【解析】A. 物体的内能与温度有关，物体质量一定时，温度降低，它的内能一定会减少，故A正确； B. 做功与热传递是改变物体内能的两种方式，物体内能增加，还有可能是对该物体做功，故B错误； C. 物体在任何温度下都具有内能，故C错误； D.热量是一个过程量，不能用“含有”来形容。故DHave you ever thought about what kind of job you would like to have when you grow up? Many people think that we can have only one job in our lifetime. We all know that this is not true, but quite a few people actually think this way. For example, when people choose a major (专业) in college, they think that the decisions they make now will decide their jobs for the rest of their lives. However, there are many examples where people became successful after changing their careers (职业) later in life.J. K. Rowling, writer of the famous novel Harry Potter, was actually a school teacher before she began writing books. In fact, she was out of work before the first Harry Potter book came out.Former US President Ronald Reagan began as an actor when he was a young man. He later decided that he wanted to do political work. This kind of passion (激情) finally led him to become President of the United States.The famous 19th century artist Vincent Van Gogh was not a painter from the beginning. He once worked as an art salesman and later became a preacher. It was only 10 years before he died that he decided to become an artist.Careers are always open to change. The important thing is to find what you are really good at or what you really want to do. Once you find that passion, it’s all a matter of how hard you try.1.______ was a teacher before he (she) became famous.A. Vincent Van Gogh B. Ronald ReaganC. J. K. Rowling D. Harry Potter2. The underlined word “political” in Paragraph 3 means ______ in Chinese.A. 政治的 B. 艺术的 C. 文学的 D. 经济的3. According to the passage, the most important thing to think of when choosing a career is ______.A. what major you choose in collegeB. how much money you can makeC. changing jobs as often as possibleD. finding what you really want to do4. How is the passage organized? (Par = Paragraph)A. Par 1→Pars 2~4→Par 5B. Pars 1~2→Par 3→Pars 4~5C. Par 1→Pars 2~3→Pars 4~5D. Pars 1~2→Pars 3~4→Par 5