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  3. Just seven years ago, the Jarvik-7 artificial heart was being cheered as the model of human creativeness. The sight of Barney Cl

Just seven years ago, the Jarvik-7 artificial heart was being cheered as the model of human creativeness. The sight of Barney Cl

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问题     Just seven years ago, the Jarvik-7 artificial heart was being cheered as the model of human creativeness. The sight of Barney Clark alive and conscious after trading his diseased heart for a metal and plastic pump the press, the public and many doctors convinced that the future had arrived. It hadn’t. After monitoring production of the Jarvik-7, and reviewing its effects on the 150 or so patients (most of whom got the device as a temporary measure) in the U. S. Food and Drug Administration concluded that the machine was doing more to endanger lives than to save them. Last week the agency cancelled its earlier approval, effectively banning the device.
    The recall may hurt Symbion Inc. , maker of the Jarvik-7, but it won’t end the request for an artificial heart. One problem with the banned model is that the tubes connecting it to an external power source created a passage for infection. Inventors are now working on new devices that would be fully placed, along with a tiny power pack, in the patient’s chest. The first sample products aren’t expected for another 10 or 20 years. But some people are already worrying that they’ll work and that America’s overextended health care programs will lose a precious $ 2. 5 billion to $ 5 billion a year providing them for a relatively few dying patients. If such expenditures cut into funding for more basic care, the net effect could actually be a decline in the nation’s health.
The word "them" (Line 7, Para. 2) refers to______.
选项 A、doctors who treat heart diseases
B、makers of artificial hearts
C、America’s health-care programs
D、new models of artificial hearts
答案D
解析 本题是一道词汇含义类问题，只不过测试的是代词所指的内容。本题问第二段中第七行中代词them指代的是什么。利用查阅式阅读法并结合语法知识，我们知道能够做them的先行词的必须是复数名词，而代词them所在的上下文指出，但是现在已经有些人在担心，一旦这种新型人造心脏获得成功，美国覆盖面很广的医疗保健项目将不得不为少数危重病人花费25亿至50亿美元去购置这些昂贵的装置。在所给的四个选项中有可能做them的先行词的是选项C中的America’s healthcare programs和选项D中的new models of artificial hearts。从句子意思看，“向为数不多的濒危病人提供”的显然是前一句中的sample products，即可与电源组一并植于人体内的new devices。因此，本题的正确答案应该是D“提供新型的人造心脏”。
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