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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.
According to the passage, the Jarvik-7 artificial heart proved to be______.
选项 A、a technical failure
B、a technical wonder
C、a good life-saver
D、an effective means to treat heart disease
答案A
解析 本题问本文论述的Jarvik一7人造心脏性能和效果最终证明是怎样的。根据文章第一段的内容，7年前，人们称赞Jarvik-7人造心脏是人类创造能力的典范。看到巴内克拉克在换了用金属和塑料做成的人造心脏后又活了、又有了意识，新闻界、公众和许多医生都以为未来世界已经成为现实。但是，经过对这种人造心脏的生产过程的进一步观察以及大约150人的试用后，美国食品和药物管理局的结论认为Jarvik-7人造心脏对生命的危害大于其拯救生命的作用，于是撤销了当初对生产Jarvik一7人造心脏的许可。因此，本题的正确答案应是A，即最终结果证明Jarvik一7人造心脏在技术上是一个失败。
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