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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.
The phrase "susceptible to" in Para. 2 could best be replaced by" ______".
选项 A、aware of
B、affected by
C、accustomed
D、prone to
答案D
解析 本题为词义辨别题。根据上下文，可以判断这句话的意思是：“另外，在睡醒之后的最初几个小时，心脏病更容易发作。” A 指“意识到……”；B 指“受……影响”；C 指“习惯于……”，与句意都不符合。而 D 表示“易于……”。
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