屋顶是建筑顶部的承重和围护构件，一般由（）几部分组成。A.屋面 B.梁 C.保温

下表中两种生产活动分布在某山脉两侧，这座山脉的名称是

示意图	山脉名称	示意图

A. 天山       B. 长白山   

C. 大兴安岭    D. 横断山脉

读下面这首诗，完成题目。

游终南山

孟郊

南山塞天地，日月石上生。

高峰夜留景，深谷昼未明。

山中人自正，路险心亦平。

长风驱松柏，声拂万壑清。

即此悔读书，朝朝近浮名。

[注释]景：日光。

下列对本诗的理解，不正确的一项是（ ）

A．这首诗写游终南山的所见所感，诗人从大处落笔，抓住景物特征写感受，虽有夸张之语却给人真切之感。

B．三四句两句通过写山中“夜留景”与“昼未明”这样不同寻常的独特景象，极言终南山峰高谷深。

C．五六两句由山及人，其中“险”与“平”互为反义，以“路险”作反衬，突出了人的心地平坦。

D．结尾两句紧承七八两句而来，借景抒情，含蓄地表达了诗人对借读书以追名逐利的现实生活的厌恶。

裸子植物通常可分为（）、（）、（）、（）和（）等五纲。

"A good newspaper is a nation talking to itself," mused Arthur Miller in 1961. A decade later, two reporters from the Washington Post wrote a series of articles that brought down President Nixon and the status of print journalism soared. At their best, newspapers hold governments and companies to account. They usually set the news agenda for the rest of the media. But in the rich world newspapers are now an endangered species. Of all the old media, newspapers have the most to lose from the Internet. Circulation has been falling in the U. S., Western Europe and Latin America for decades. But in the past few years the web has hastened the decline. In his book The Vanishing Newspaper, Philip Meyer calculates that the first quarter of 2043 will be the moment when newsprint dies in the U. S. as the last exhausted reader tosses aside the last crumpled edition. Newspapers have not yet started to shut down in large numbers, but it is only a matter of time. Over the next few decades half the rich world’s general papers may fold. Jobs are already disappearing. According to the Newspaper Association of America, the number of people employed in the industry fell by 18% between 1990 and 2004. Having ignored reality for years, newspapers are at last doing something. In order to cut costs, they are already spending less on journalism. Many are also trying to attract younger readers by shifting the mix of their stories towards entertainment, lifestyle and subjects that may seem more relevant to people’s daily lives than international affairs and politics are. They are trying to create new businesses on-and offline. And they are investing in free dally papers. So far, this fit of activity looks unlikely to save many of them. Even if it doest, it bodes ill for the public role of the Fourth Estate. Nobody should relish the demise of once-great titles. But the decline of newspapers will not be as harmful to society as some fear. Democracy, remember, has already survived the huge television-led decline in circulation since the 1950s. It has survived as readers have shunned papers and papers have shunned what was in stuffier times thought of as serious news. And it will surely survive the decline to come. The usefulness of the press goes much wider than investigating abuses or even spreading general news; it lies in holding governments to account -- trying them in the court of public opinion. The Internet has expanded this court. Anyone looking for information has never been better equipped. People no longer have to trust a handful of national papers or, worse, their local city paper. In future, some high-quality journalism will be backed by non-profit organizations. Already, a few respected news organizations sustain themselves that way. An elite group of serious newspapers available everywhere online, independent journalism backed by charities, thousands of fired-up bloggers and well-informed citizen journalists: there is every sign that Arthur Miller’s national conversation will be louder than ever.

The author cites all the following EXCEPT that ______ to show that newspapers are not killed.

A．newspapers have the most to lose from the Internet

B．the web has hastened the decline of the circulation

C．newspapers won’t die out in the U. S. until 2043

D．ever more young people are getting their news online

石膏的主要成分是

A．含水碳酸钙

B．含水硫酸钙

C．硫酸钙

D．碳酸钙

E．无水硫酸钠