统计方法一般有哪些方面的用途?

已知一个多边形的内角和等于900^。，则这个多边形的边数是（     ）

在横线里填上“＞”、“＜”或“=”．

130×30______13×300

30×310______450×20

220×10______30×110．

作家有三种死法．一日自然的死，二曰痛苦的死，三日快乐的死．自然的死属于心脏停止跳动，是一种普遍的死亡形式，没有特色，可以略而不议．快乐的死和痛苦的死不属于心脏停止跳动，是人还活着，作品已经或几乎是没有了!作家没有了作品，可以看作是个人艺术生命的死亡、职业的停顿．其中有些人是因为年事已高，力不从心．这不是艺术的死亡，而是艺术的离休，他自己无可自责，社会也会尊重他在艺术上曾经作出的贡献．痛苦的死亡却不然，即当一个作家的体力和脑力还能胜任创作的时候，作品已经没有了，其原因主要是由于各种苦难和折磨(包括自我折磨)所造成．折磨毁了他的才华，苦难消沉了意志，作为人来说他还活着，作为作家来说却正在或已经死去．这种死亡他自己感到很痛苦，别人看了心里也很难受．快乐的死亡却很快乐，不仅他自己感到快乐，别人看来也很快乐．昨天看见他大会上做报告，下面掌声如雷；今天又看见他参加宴会，为这为那地频频举杯．昨天看见他在高朋中大发议论，语惊四座；今天又看见他在那些开不完的座谈会上重复昨天的意见．昨天看见他在北京的街头；今天又看见他飞到了广州……只是看不到或很少看到他的作品发表在哪里．我不害怕自然的死亡，因为害怕也没用，人人不可避免．我也不太害怕痛苦的死，因为那时代已经过去．我最害怕的就是那快乐的死，毫无痛苦，十分热闹，甚至还有点轰轰烈烈．自己很难控制，即很难控制在一定的范围之内．因为我觉得喝酒不一定完全是坏事，少喝一点可以舒筋活血，据说对心血管也是有帮助的．作家不能当隐士，适当的社会活动和文学活动可以开阔眼界，活跃思想，对创作也是有帮助的．可是怎么才能不酗酒，不做酒鬼，这有益的定量究竟是多少呢怕只怕三杯下肚，豪情大发，嘟嘟嘟，来个瓶底朝天，而且一顿喝不上便情绪不高，颇有怨言，甚至会到处去找酒喝．呜呼，快乐地死去

下列对这篇散文的赏析，正确的是 ______．

A．这篇散文，一事一议，短小精悍．文章开门见山，提出作家三种死法，然后层层剥开，逐一论去，并重点剖析快乐的死亡，显得条理分明

B．作者认为，作家没有了作品就是艺术生命的死亡，“艺术的死亡”是可悲可叹的，而“艺术的离休”则是可贺可敬的．这是实事求是的看法

C．第五段“快乐的死亡却很快乐，不仅他自己感到快乐，别人看来也很快乐．”巧妙地运用了反语，极具讽刺意味，引入警醒，发人深思

D．本文在语言应用上体现出一种质朴无华的文风，简练直白，干脆利落，富于变化．美中不足的是仅以作家为例，不免有一定的局限性

Enter the information age. Information is the raw material for many of the business activities shaping this new era, (1) iron and steel were the basic commodities in the dawning of the industrial age.

The world’ s knowledge is said to be doubling (2) eight years. This knowledge explosion is (3) economic progress. The need to collect, analyze, and communicate (4) quantities of information is Spawning new products and services, creating jobs, and widening career opportunities.

The information age is (5) considered to be a phenomenon of the service sector of the economy, (6) a product of heavy industry. Certainly, burgeoning information technologies are creating new capabilities (7) knowledge-based service spheres. But changes just as dramatic are (8) industry, giving people the opportunity to do challenging work in exciting new ways.

Manufacturing is a full participant in the information age. From design (9) production, the manufacturing process has long been in formation-intensive. It always has required exacting communication to describe (10) goes into products and how to make them, Now, computer technology is giving factory managers new capability to gather all of this information and (11) it to control production.

Telecommunications are producing error-free communication between the design office (12) the factory, computer-aided design is enabling engineers to evaluate product performance and manufacturing process (13) video displays, before resources are committed to build and test prototypes. Techniques like these are bringing (14) new advances in manufacturing productivity.

Just as coal fueled the transformation to an industrial society, (15) microelectronics is powering the rise of the information age. Microelectronic information-management tools are strengthening U. S. industrial capability, (16) remains vital to America’ s economic well being and national security.

More and more manufacturing companies are (17) that the wise of information can give them a competitive edge. As companies emphasize (18) information management, talented people will continue to find (19) to make factories and milks sing with increased productivity.

In manufacturing as well as in services, information technology is a tool to (20) human creativity into productivity.

Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. (10 points)6（）

A．in

B．by

C．over

D．on

药学信息服务的可靠性主要针对的是

A．信息必须是新颖的

B．信息是有效的

C．信息的内容准确、真实、可靠

D．信息不属于商业信息

E．信息不属于军事信息