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31. 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 注：对老成果负评价 32. From the passage we know that Symbion Inc. ________. A) has been banned by the government from producing artificial hearts B) will review the effects of artificial hearts before designing new models C) may continue to work on new models of reliable artificial hearts D) can make new models of artificial hearts available on the market in 10 to 20 years 注：屡败屡战。A 选项为泛指而文章为特指;B 选项为窜段选项，另外选项中的 artificial hearts 扩大了文章中的指代范围。 二段首句：The recall may hurt Symbion Inc, maker of the Jarvik-7, but it wont end the request for an artificial heart. 33. The new models of artificial hearts are expected _________. A) to have a working life of 10 or 20 years B) to be set fully in the patients chest C) to be equipped with an external power source D) to create a new passage for infection | 
