刚地弓形虫感染宿主为（）。A.人 B.哺乳动物 C.鸟类 D.鱼类 E.以上都是

My last job lacked variety; I __________ the same things all the time.

A．did

B．have done

C．was doing

D．have been doing

联锁操作中所有安全相关命令的操作可以在（）进行。

A、MMI

B、SICAS

C、LOW工作站

D、ATS

以下可排除结核菌感染的是

A．PPD试验阴性
B．痰找结核菌阴性
C．血沉正常
D．X线胸片未见浸润性病灶
E．以上均不是

Almost everyone agrees that America’s health-care system has the incentives all wrong. Under the present system, doctors and hospitals get paid for doing more, even if added tests, operations and procedures have little chance of improving patients’ health. So what happens when someone proposes that we alter the incentives to reward better care, not more care Well, Rep. Paul Ryan and Republicans found out. No surprise: Democrats slammed them for "ending Medicare as we know it. "

This predictably partisan reaction preying upon the anxieties of retirees—must depress anyone who cares about the country’s future. It is only a slight exaggeration to say that unless we end Medicare "as we know it," America "as we know it" will end. Spiraling health spending is the crux of our federal budget problem. In 1965—the year Congress created Medicare and Medicaid—health spending was 2.6 percent of the budget. In 2010, it was 26.5 percent. The Obama administration estimates it will be 30.3 percent in 2016. By contrast, defense spending is about 20 percent; scientific research and development is 4 percent.

Uncontrolled health spending isn’t simply crowding out other government programs; it’s also dampening overall living standards. Health economists Michael Chernew, Richard Hirth and David Cutler recently reported that higher health costs consumed 35.7 percent of the increase in per capita income from 1999 to 2007. They also project that, under reasonable assumptions, it could absorb half or more of the gain between now and 2083.

Ryan proposes to change that. Beginning in 2022, new (not existing) Medicare beneficiaries would receive a voucher, valued initially at about $ 8,000. The theory is simple. Suddenly empowered, Medicare beneficiaries would shop for lowest-cost, highest-quality insurance plans providing a required package of benefits. The health-care delivery system would be forced to restructure by reducing costs and improving quality. Doctors, hospitals and clinics would form networks; there would be more "coordination" of care, helped by more investment in information technology; better use of deductibles and co-payments would reduce unnecessary trips to doctors’ offices or clinics.

It’s shock therapy. Would it work No one knows, but two things are clear. First, as Medicare goes, so goes the entire health-care system. Medicare is the nation’s largest insurance program, with 48 million recipients and spending last year of $ 520 billion. Second, few doubt that today’s health-care system has much waste: medical care that does no good.

Under Ryan’s plan, incentives would shift. Medicare would no longer be an open ATM; the vouchers would limit total spending. Providers would face pressures to do more with less; there would certainly be charges that essential care was being denied. The Obama administration argues that better results can be achieved by modifying incentives within the existing system. Perhaps. But history suggests skepticism. It’s Ryan’s radicalism vs. President Obama’s remedy policy. Which is realistic and which is wishful thinking Burdened by runaway spending, Medicare "as we know it" is going to end. The only questions are when and on whose terms.

The text is written to answer the question（）

A. Is Obama’s health-care policy wishful thinking

B. On whose terms should new medicare plan be formulated

C. Why is Ryan’s medicare plan too radical

D. Why must we end medicare "as we know it"

市场细分的模式有三种，下列选项不属于这三种模式的是（）。

A.同质偏好

B.异质偏好

C.扩散偏好

D.集群偏好