怎样回答阅读理解中的细节性问题

　　
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 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'11 work- and that America's 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( 开支)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 ________.
A) a technical failure
B) a technical wonder
C) a good life-saver
D) an effective means to treat heart disease

　　 本题是考核学生根据止下文全面理解和进行正确判断的能力，问的是本文论述的Jarvik-7人造心脏性能和效果到底如何。文章一开头说Jarvik-7是一大技术成就，但文章说到：…the .U.S. Food and Drug Administration concluded that the machine was doing more to endanger lives than to save them (Line -7-9).后面又提到：Last week the agency canceled its earlier approval , effectively banning the device.这两句话提供了这个问题的答案。因此，答案是A)。

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