历年英语四级的考试阅读理解部分2_大学英语阅读

　　an artificial heart. One problem with the banned mode 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 patients chest. The first sample

　　products arent expected for another 10 or 20 years. But some people are already worrying that

　　theyll workand that Americas overextended healthcare 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 nations health.

　　28. According to the passage, the Jarvik-7 artificial heart proved to be _____.

　　a technical failure

　　a technical wonder

　　a good life-saver

　　an effective means to treat heart disease

　　29. From the passage we know that Symbion Inc. _____.

　　has been banned by the government from producing artificial hearts

　　will review the effects of artificial hearts before designing new models

　　may continue to work on new models of reliable artificial hearts

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