13．The researchers came to the conclusion ________.

　　A．by doing experiments in hospitals

　　B．by observing the traffic in the streets

　　C．by surveying patients in hospitals

　　D．by interviewing drivers trapped in traffic jams

　　解析：选C。推理判断题。根据第二段中的“They interviewed nearly 1,500 patients...”可知，研究者通过调查医院的患者，然后分析结果的方式得出结论“there is a strong link between traffic jams and developing a heart attack”。

　　14．From the last two paragraphs，we can know that ________.

　　A．nearly half of all heart attack cases have a link with traffic

　　B．taking public transportation will certainly avoid heart attacks

　　C．women are less likely to be affected by traffic than men

　　D．unemployed women patients may be affected by traffic most

　　解析：选D。细节理解题。由最后一段“The team has also found that women，elderly men，patients who were unemployed...Female participants，in fact，were more likely to have a 5 times greater risk of a heart attack following such exposure，compared to men.”可知失业的女病人受到交通的影响可能最严重。

　　15．What could be the best title for the passage?

　　A．Traffic Jams Are a Great Concern

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