肛瘘最常见的类型为（） A.经肛管括约肌型 B.高位复杂性肛瘘 C.肛管括约肌外型

与中国相比，俄罗斯（　　）

A．纬度更低

B．面积更小

C．资源更缺

D．人口更少

如图所示,将带正电的粒子从电场中的A点无初速地释放,不计重力的作用,则下列说法中正确的是　　（　  ）

A．带电粒子一定做加速直线运动

B．带电粒子的电势能一定逐渐增大

C．带电粒子的加速度一定越来越小

D．带电粒子的加速度一定越来越大

依次填入下列各句横线处的词语，恰当的一组是（ ）

①我不仅爱祖国的山河大地，就是一草一木，一花一石，我也感到亲切，感到值得我＿＿和爱抚。

②盆景把宏伟的山川变为庭院里的小摆设。有人＿＿这些东西，认为这是人们按照自己的审美理想来安排山川。但在我看来，这些“理想”多少带有消闲的情趣。

③花园里的一草一木，都经过了精心的＿＿，因为这花园也想与肖邦的音乐相般配。

A．留恋赞颂培育

B．留念赞颂栽培

C．留恋赞赏栽培

D．留念赞赏培育

( )项目管理模式在国际上最为通用，世界银行、亚洲开发银行贷款项目和采用国际咨询工程师联合会(FDIC)的合同条件的项目均采用这种模式。

A．CM

B．总承包

C．设计一招标一建造

D．BOT

Exactly where we will stand in the long war against disease by the year 2050 is impossible to say. (46) But if developments in research maintain their current pace, it seems likely that a combination of improved attention to dietary and environmental factors, along with advances in gene therapy and protein targeted drugs, will have virtually eliminated most major classes of disease.

From an economic standpoint, the best news may be that these accomplishments .could be accompanied by a drop in health-care costs. (47) Costs may even fall as diseases ’are brought under control using pinpointed, short-term therapies now being developed. By 2050 there will be fewer hospitals, and surgical procedures will be largely restricted to the treatment of accidents and other forms of trauma. Spending on nonacute care, both in nursing facilities and in homes, will also fall sharply as more elderly people lead healthy lives until close to death.

One result of medicine’s success in controlling disease will be a dramatic increase in life expectancy. (48) The extent of that increase is a highly speculative matter, but it is worth noting that medical science has already helped to make the very old (currently defined as those over 85 years of age) the fastest growing segment of the population. Between 1960 and 1995, the U.S. population as a whole increased by about 45%, while the segment over 85 years of age grew by almost 300%. (49) There has been a similar explosion in the population of centenarians, with the result that survival to the age of 100 is no longer the newsworthy feat that it was only a few decades ago. U.S. Census Bureau projections already forecast dramatic increase in the number of centenarians in the next 50 years: 4 million in 2050, compared with 37, 000 in 1990.

(50) Although Census Bureau calculations project an increase in average life span of only eight years by the year 2050, some experts believe that the human life span should not begin to encounter any theoretical natural limits before 120. years. With continuing

(46) But if developments in research maintain their current pace, it seems likely that a combination of improved attention to dietary and environmental factors, along with advances in gene therapy and protein targeted drugs, will have virtually eliminated most major classes of disease.