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
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
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