题目

“绿色奥运”是2008年北京奥运会的主题之一．为减轻大气污染，在汽车尾气排放口加装“三效催化净化器”在不 消耗其他物质的情况下，可将尾气中的CO、NO转化为参与大气循环的无毒气体．试推测，该无毒混合气体是（ ） A．N2 和  CO2B．CO2和  NO2C．CO2 和 O2D．CO2 和   SO2 答案：【考点】质量守恒定律及其应用． 【专题】元素质量守恒；化学用语和质量守恒定律． 【分析】由题意：反应物为NO、CO，则生成物也是由氮、碳、氧三种元素组成，结合结合质量守恒定律、空气的成分进行分析判断解答即可． 【解答】解：由题意：反应物为NO、CO；根据质量守恒定律可知，生成物是8、Despite rising education levels, Americans of every age are reading less and less for pleasure these days, according to an analysis by the National Endowment for the Arts. The decline (下降) could have bad effects as people tune out books, tune in popular culture and become less socially engaged. “We’ve got a public culture which is almost entirely commercial (商业化) and novelty – driven (追新),” says NEA chairman Dana Gioia. “I think it’s letting the nation down.” The study gathers years of data on Americans’ reading habits and finds that, at every age group, we’re reading less. Most of the data have appeared in private, government and university surveys, but today’s report is the first to combine them into a single portrait. It suggests that the demands of school, work and family and the decisive advantage of other forms of entertainment have caused the decline in reading for millions of Americans. ·Only 38% of adults in 2006 said they had spent time reading a book for pleasure. ·65% of college freshmen in 2005 said they read little or nothing for pleasure. ·30% of 13 – year – olds in 2004 said they read for fun “almost every day,” down from 35% in 1984. According to Gioia, a poet, they decline is probably the single most important social issue in the United States today. The findings should be a wake – up call to educators to change the way they teach literature at every level. It was once believed that if someone went to college, they would become a lifelong reader. What we’re seeing right now is that we’re no longer producing readers. We’re producing B. A. s and M. A. s and Ph. D. s. Cioia also wants main media to wake up to how they can promote good books in many ways. He notes that when a character in the 1994 film Four Weddings and a Funeral recited a few lines of W. H. Auden’s poem Funeral Blues, the poet briefly became a best seller. 1．The underlined phrase “tune out” in the first paragraph probably means        .        A．close                   B．publish                C．prove                  D．read 2．According to Dana Gioia, the change of Americans’ reading habit       .        A．is positive and valuable                         B．does harm to the nation        C．is caused only by popular culture           D．can make poets best sellers 3．Which of the following is NOT the cause for the change in reading habit?        A．Demands of getting a B. A., M. A. or Ph. D.        B．Demands of family, school and work.        C．The change in the way the literature is taught.        D．Advantages of the entertainment. 4．We can infer that the number of teenagers reading for pleasure reduced by       in 20 years.        A．30%         B．38%         C．65%         D．5%