问答题

As heart disease continues to be the number-one killer in the United States, researchers have become increasingly interested in identifying the potential risk factors that trigger heart attacks. ( Passage Two)

【参考答案】

因为心脏病仍然是美国的第一号杀手，研究人员越来越热衷于找出引发心脏病的潜在危险因素。

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Perhaps the greatest puzzle of all is not why some people are left-handed, but rather why so few are. (Passage One)

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They are one in ten of us who are left-handed and must face the world designed for the right-- handed majority. (Passage One)