腰椎CT示椎小关节间隙狭窄，内含气体，关节面增生，最可能的诊断是（） A.类风湿关节

For health insurance, the United States has taken the road less traveled. The United States is the only rich country without universal health insurance. People in the United States spend the most, rely heavily on the private sector, and obtain care from the world’s most complicated delivery system. While some supporters have expressed satisfaction, if not pride, in these remarkable qualities, others contend that the United States faces unique limitations in reforming health care.

In her exceptional book,Parting at the Crossroads, Antonia Maioni compares the formation of the U.S. and Canadian health-care systems for the years 1930—1960. The United States and Canada are often considered the most similar of Western democracies. They share a common border, are wealthy, and have federal government. Their trade unions are only moderately powerful, and their populations are diverse and young. Nevertheless, their heath-insurance systems are nearly opposite. The United States relies on a mix of government plans. Targeted to the elderly and indigent, and employment based plans, which the government indirectly supports, Canada offers public health insurance to all qualified resident, with the private sector providing supplementary services in some provinces.

Labor organizations became p advocates for health-insurance reform in both countries. Their impact partially depended on political institutions and how other actors, particularly organized medicine, wielded them. Canada’s governmental and electoral systems allowed labor to cooperate with a social democratic party in the Saskatchewan province, which established a universal program. The Saskatchewan program demonstrated universal insurance feasibility, spurring the dominant Liberals to introduce a national universal program. In contrast, the U. S. electoral system effectively precluded third-party formation, forcing organized labor to dilute its health-insurance goals because it was one of many interests represented by the Democratic Party.

Maioni suggests that economic vitality is important for the future of both countries’ systems, but the prognosis is uncertain. Despite recent concerns about the Canadian government’s budgetary health, Maioni contends that widespread support protects universal insurance. Conversely, Maioni seems pessimistic about options for U.S. universal health insurance. Despite economic buoyancy, dissension will likely prevent reforms. Although a devastating econmnic downturn would make health finance difficult in either country, the U.S. system seems especially vulnerable. Employment-based insurance and Medicare both rely on labor market attachment. High, chronic unemployment could result in coverage loss and financial difficulties for employer insurance and Medicare, swelling the uninsured pool. Such a crisis could provide an opening for universal health insurance. In any case, whether the United States relies on the public or private sector, escalating health expenditures figure into budget of government, corporations, and families, the U. S. health care system’s future may depend on Americans" willingness to devote more of their national income to health care.

From the first sentence we learn that the United States（）

A. has gone aslray about what it does with health insurance

B. has complicated its heahh insurance policy and confused its people

C. has reformed its heahh care to their average people’s satisfaction

D. carries out a different health insurance policy home other Western countries

聚乙烯、聚氯乙烯、有机玻璃都是常见的塑料。塑料属于[ ]

A．金属材料

B．合成材料

C．复合材料

D．无机非金属材料

下列说法正确的是（  ）

A．相互作用力是大小相同，方向相同的

B．重力的方向总是竖直向下的

C．摩擦阻力的方向与物体相对运动方向相反

D．力的作用效果好差只由力的大小决定

心跳骤停是指心脏突然衰竭而不能搏出足量的血液以保证脑的存活。

根据教育对象不同，教育规划可以分为（）和（）两种。

A.职业教育规划；子女教育规划

B.职业教育规划；素质教育规划

C.基本教育规划；素质教育规划

D.义务教育规划；高等教育规划