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
2.根据单复数缩小范围
3.注意结合动词判断所指代为人、事或物
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,按照指代题的作法解题
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