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【分析解答题】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)
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试题答案： 答案解析：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。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>