题目

如图所示，给出4个幂函数的图象，则图象与函数的大致对应是（ ） A.①，②，③，④ B.①，②，③，④C.①，②，③，④ D.①，②，③，④ 答案：【答案】B【解析】判断函数的定义域、奇偶性、单调性等，结合幂函数的图像性质分析判断即可.对于图①，函数图象关于原点对称，为奇函数，且在上递增，故只有符合；对于图②，函数图象关于轴对称，为偶函数，且在上递增，故只有符合；对于图③，函数的定义域为，且为增函数，故符合；对于     Recently I paid a visit to Harvard University, where there are top class scientists and professors and the best academic(学术的)system in the world.     I was pretty shocked when I first stepped onto the campus(校园). Well, it's not even really a campus. It's more like a district in a small town.     Harvard's main buildings are from the 18th century. They look very old and simple. You might even say they're a little old. They don't fit the modern idea of university at all. The buildings are surrounded by grass and trees, so I felt as if I had walked into a medieval castle(中世纪的城堡). But when I looked across the street, busy shops and in-fashion students made me feel like I was in the 21st century again. Itcreates a strong contrast(对比)and brings a special atmosphere to the school.     Our tour guide Gary took us around and told us: "You see this grass field in the center of the school? Here is where they host their graduation ceremony（毕业典礼）. They just set up tents and benches and have a very simple ceremony." Unbelievable! Who would think the most talented students just graduate on the lawn?     I saw some students put a blanket on the grass and lie down to read a book. When I listened to the soft sound of pages turning, along with singing of the birds, I felt very calm. There was no competitive feeling at all.     Harvard has the world's first computer in its science center and there are hundreds of high-end computers too. Its religion and the literature departments are also among the best. It is the perfect mix of tradition and new technology. It makes Harvard a very attractive place to study in.     I hope one day I’ll attend my dream school - Harvard.1. The article is mainly about        .  A. the author's campus life in HarvardB. the author's impression of HarvardC. Harvard's old buildingsD. the academic system at Harvard2. The author was most impressed by        , according to the article.  A. Harvard's mix of tradition and new technologyB. the classes held on beautiful lawns at HarvardC. Harvard students not taking their graduation ceremony seriouslyD. the feeling of not living in modern society on the campus3. What can we conclude from the article?  A. Harvard campus is actually a district of a big city.B. There are no competitions at Harvard University.C. Graduation ceremonies are not complex(复杂的)at Harvard.D. All Harvard buildings date back to the 18th century.4. According to the article, in which fields is Harvard top in the world?  A. Literature, arts, and law. B. Religion, law and arts.C. Literature, arts and computer science.D. Religion, computer science and literature. 5. Which word can be used to describe the Harvard campus?  A. modernB. competitive    C. peaceful  D. old