意大利建筑师布鲁内莱斯基在1420—1436年间为佛罗伦萨大教堂建造一个41米宽，1

(1)放干湖水(2)同学们参加义务劳动(3)清理淤泥(4)湖边风景焕然一新(5)挖冰块

A．2-1-5-3-4

B．1-2-3-5-4

C．3-5-1-2-4

D．2-5-1-3-4

When Newsweek recently asked 1,000 U. S. citizens to take America’s official citizenship test, 29 percent couldn’t name the vice president. Seventy-three percent couldn’t correctly say why we fought the Cold War. Forty-four percent were unable to define the Bill of Rights. And 6 percent couldn’t even circle Independence Day on a calendar.

Don’t get us wrong: civic ignorance is nothing new. For as long as they’ve existed, Americans have been misunderstanding checks and balances and misidentifying their senators. And they’ve been lamenting the ignorance of their peers ever since pollsters started publishing these dispiriting surveys back in Harry Truman’s day. According to a study by Michael X. Delli Carpini, dean of the Annenberg School for Communication, the yearly shifts in civic knowledge since World War II have averaged out to "slightly under 1 percent. "

But the world has changed. And unfortunately, it’s becoming more and more inhospitable to incurious know-nothings—like us. To appreciate the risks involved, it’s important to understand where American ignorance comes from. In March 2009, the European Journal of Communication asked citizens of Britain, Denmark, Finland, and the U.S. to answer questions on international affairs. The Europeans outdid us. It was only the latest in a series of polls that have shown us lagging behind our First World peers.

Most experts agree that the relative complexity of the U. S. political system makes it hard for Americans to keep up. In many European countries, parliaments have proportional representation, and the majority party rules without having to "share power with a lot of subnational governments," notes Yale political scientist Jacob Hacker. In contrast, we’re saddled with a nonproportional Senate; a tangle of state, local, and federal bureaucracies; and near-constant elections for every imaginable office (judge, sheriff, school-board member, and so on). "Nobody is competent to understand it all, which you realize every time you vote," says Michael Schudson, author of The Good Citizen. "You know you’re going to come up short, and that discourages you from learning more. "

It doesn’t help that the United States has one of the highest levels of income inequality in the developed world, with the top 400 households raking in more money than the bottom 60 percent combined. As Dalton Conley, an NYU sociologist, explains, "it’s like comparing apples and oranges. Unlike Denmark, we have a lot of very poor people without access to good education, and a huge immigrant population that doesn’t even speak English. " When surveys focus on well-off, native-born respondents, the U. S. actually holds its own against Europe.

For more than two centuries, Americans have gotten away with not knowing much about the world around them. But times have changed—and they’ve changed in ways that make civic ignorance a big problem going forward. We suffer from a lack of information rather than a lack of ability. Whether that’s a treatable affliction or a terminal illness remains to be seen. But now’s the time to start searching for a cure.

America’s civic ignorance（）

A. is largely attributable to its unwillingness to learn

B. can not be corrected by any kind of method

C. has become an affliction in the fast-changing world

D. can be traced back to its rising dominance in the world’s affairs

个人计算机通过宽带网连接Internet时，主要使用（ ）连接到网络。

A．电话线

B．闭路电视

C．双绞线

D．同轴电缆

互联单位、接入单位及使用计算机信息网络国际联网的法人，应当履行的安全保护职责有（）。

A.负责保护本网络的安全保护工作，建立健全安全保护管理制度

B.落实安全保护技术措施，保障本网络的安全运行

C.对委托发布信息的单位和个人进行登记，并对提供的信息内容进行审核

D.发现信息违法犯罪活动，应当保留有关原始记录，并在24小时内向当地公安机关报告