题目

已知A为淡黄色固体，R和T是两种生活中常见的金属单质，C、F是无色无味的气体。 （1） 物质A的化学式为，D化学式为，W的化学式为； （2） B与R反应生成F的离子反应式为； （3） A与CO2反应的化学反应方程式为； （4） H转化为M的化学反应方程式为； 答案：【1】Na2O2【2】Fe3O4【3】FeCl3 【1】2Al+2OH﹣+2H2O=2AlO﹣2+3H2↑ 【1】2Na2O2+2CO2=2Na2CO3+O2 【1】4Fe(OH)2+O2+2H2O=4Fe(OH)3Do you want to know anything about ma staying in America? Well, Let me tell you the truth, it is really an eye-opening experience to study here.In China, I had English classes five times a week since the fifth grade. However didn’t know textbook English was very different from everyday English until I came to Hotchkiss School, Connecticut.When I first studied English, I was told to say，“I am fine” when people say “How are you?”But in the US, I found that people say,” I am good” or “I am tired.”One day, someone greeted me with” What’s up?”It made me confused. I thought for a moment and then smiled because I didn’t know what to say.Since then, I have discovered more and more differences between Chinese and the US cultures.To my surprise, the US girls spend a lot of time in burning sun getting a tan （晒黑）. However, in China, girls try every possible way to get their skin paler（白的）.I am also surprised by how hardworking the US students are. In China, schoolwork is almost everything, so we study hard all the time. But here, an “excellent” student gets good grades, does a lot for the public and plays sports or music .The kids here are so talented ，I am starting to be sorry that I gave up playing the piano at an early age and that I have never thought about sports.小题1: How often did the writer have an English class in Grade Five?A. Four times a week. B. Five times a week. C. Six times a week.小题2:To the winter, textbook English is          everyday English.A. quite different from B. the same as   C. easier than小题3:A good US student spends his/her time         .A. only in doing homework B. only on sports or musicC. on studies, sports or music and public work小题4:Which of following is NOT true?             A. The writer is now in the USB. American girls love to have while skinC. The US students are talented and hard working.小题5:Which is the best title for the passage?           A. My own Travel in the US.B. My Study in the US. C. My friends in the US.