2.文中出现新、老两个成果，新成果正评，老成果负评，抓住正负评价原因

　　3.抓住新老成果各自技术特点

　　The recall may hurt Symbion Inc, maker of the Jarvik-7, but it wont 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 patients chest. The first sample products arent expected for another 10 or 20 years. But some people are already worrying that theyll work - and that Americas 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 nations health.

　　注：1.recall 取消，re 有向后含义

　　2.看到Symbion Inc.就把32题标在这里;看到new devices就把33题标在这里。

　　3.external 外部的，passage 通道

　　4.work 可行、有效，they 指代前文 the first sample product

　　5.providing 引导现在分词做状语

　　指代题做法：1.将代词所在句代词之前部分的名词以及代词之前句子的名词划出

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