As heart disease continues to be number-one killer in the United States, res

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问题 As heart disease continues to be number-one killer in the United States, researchers have become increasingly interested in【B1】______ the potential risk factors that【B2】______ heart attacks. High fat diets and "life in the fast lane" have long been known to contribute to the high【B3】______ of heart failure. But according to new studies, the list of risk factors may be【B4】______ longer and quite surprising.
Heart failure, for example, appears to have seasonal and【B5】______ patterns. A higher percent age of heart attacks occur in cold weather, and more people experience heart failure on Monday than on any other day of the week. In addition, people are more【B6】______ to heart attacks in the first few hours after waking. Cardiologists first observed this morning【B7】______ in the mid-1980s and have since discovered a number of possible causes. An early-morning rise in blood pressure, heart rate, and concentration of heart【B8】______ hormones, plus a reduction of blood flow to the heart,【B9】______ .
In other studies, both birthdays and bachelorhood have been implicated as risk factors.
Statistics reveal that【B10】______ And unmarried men arc more at risk for heart attacks than their married counterparts.【B11】______ . [br] 【B4】

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As heart disease continues to be number-one killer in the United States, res

[originaltext]AbouttwopercentofthepopulationoftheUnitedStatesiso

[originaltext]AbouttwopercentofthepopulationoftheUnitedStatesiso