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  3. As heart disease continues to be the number-one killer in the United States, researchers have become increasingly interested in

As heart disease continues to be the number-one killer in the United States, researchers have become increasingly interested in

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问题     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. High-fat diets and "life in the fast track" have long been known to contribute to the high incidence of heart failure. But according to new studies, the list of risk factors may be significantly longer and quite surprising.
    Heart failure, for example, appears to have seasonal and temporal patterns. A higher percentage 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 susceptible to heart attacks in the first few hours after waking. Cardiologists first observed this morning phenomenon in the mid-1980, and have since discovered a number of possible causes. An early-morning rise in blood pressure, heart rate, and concentration of heart stimulating hormones, plus a reduction of blood flow to the heart, may all contribute to the higher incidence of heart attacks between the hours of 8:00 AM and 10:00 AM.
    In other studies, both birthdays and bachelorhood have been implicated as risk factors. Statistics reveal that heart attack rates increase significantly for both females and males in the few days immediately preceding and following their birthdays. And unmarried men are more at risk for heart attacks than their married counterparts. Though stress is thought to be linked in some way to all of the aforementioned risk factors, intense research continues in the hope of further comprehending why and how heart failure is triggered.
According to the passage, which of the following is NOT a possible cause of many heart attacks?
选项 A、Decreased blood flow to the heart.
B、Increased blood pressure.
C、Lower heart rate.
D、Increase in hormones.
答案C
解析 本题为是非判断题。在第二段中提到“An early-morning rise in blood pressure, heart rate, and concentration of heart stimulating hormones, plus a reduction of blood flow to the heart, may all contribute to the higher incidence of heart attacks between the hours of 8:00 A. M. and l0;00 A. M.”(清早，血压上升，心跳加快，心脏荷尔蒙的聚集，还有流向心脏的血液量减少，这些都会在上午八点到十点之间使心脏病发病机会增加。) A、B、D均是心脏病的发病原因，而 C 与“a rise in heart rate”意思相反。
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