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34. The word them in Line 7, Para. 2 refers to _________. A) doctors who treat heart diseases B) makers of artificial hearts C) Americas health-care programs D) new models of artificial hearts 注：指代题 35. Some people feel that _________. A) artificial hearts are seldom effective B) the country should not spend so much money on artificial hearts C) the country is not spending enough money on artificial hearts D) Americas health-care programs are not doing enough for the nations health Questions 31 to 35 are based on the following passage: 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 - convinced the press, the public and many doctors that the future had arrived. It hadnt. After monitoring production of the Jarvik-7, and reviewing its effects on the 150 or so patients 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. 注：1.cheer 欢呼、喝彩 | 
