题目

对下列现象或事实的解释正确的是（ ） 现象或事实解释ASO2在工业上常用来漂白纸浆、毛丝、草帽辨等SO2具有还原性BK2FeO4用于自来水的消毒和净化Fe3+水解生成胶状物，有消毒和净化作用CNa2O2用于呼吸面具中作为O2的来源Na2O2是强氧化剂，能氧化CO2生成O2D常温下可用铁、铝制容器盛装浓硫酸或浓硝酸铁、铝表面被氧化为致密的氧化物薄膜，阻止了酸与内层金属的进一步反应 A.A B.B C.C D.D根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。Taking good notes is a time-saving skill that will help you to become a better student in several ways. 1. Second, your notes are excellent materials to refer to when you are studying for a test. Third, note-taking helps you to hold your interest.You will want to take notes during classroom discussions and while reading a textbook or doing research for a report. 2. Whenever or however you take notes, keep in mind that note-taking is a selective process. 3.The following methods may work best for you.·Read the text quickly to find the main facts and ideas in it.·Carefully read the text and watch for words that can show main points and supporting facts.·Write your notes in your own words.· 4.·Note any questions or ideas you may have about what was said or written.As you take notes, you may want to use your own shorthand (速记). When you do, be sure that you understand your symbols and that you use them all the time. 5.A．Use words, not complete sentences.B．There are three practical note-taking methods.C．You must write your notes on separate paper.D．Otherwise, you may not be able to read your notes later.E．You will also want to develop your own method for taking notes.F．That means you must first decide what is important enough to include in your notes.G．First, the simple act of writing something down makes it easier for you to understand and remember it.