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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 lane" 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 stimulatin 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 10:00 A.M.

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 .

What does the passage mainly discuss?

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Known worldwide by its panda logo, World Wildlife Fund (WWF) is dedicated to protecting _____________ world's wildlife and the rich biological diversity that we all need to survive.

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Rainwater carries $\underline{unused chemicals}$ from fields into $\underline{streams of lakes}$, where $\underline{various compounds}$ promote the $\underline{\underline{rate growing}}$ of weeds

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My friend lives in a (n)_____warehouse in a very fashionable part of town.

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I don’t think he will ever get____the shock of his father's death.

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James is always good ____ as he’s so easy-going.

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The local government tried to  the seriousness of the disaster.

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I as soon as my head hit the pillow.

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You should _____ documents displaying personal information before you throw them away.

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The world’s $\underline{rain}$forests $\underline{are being}$ cut down at the rate on 3,000 acres $\underline{per hour}$.

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My little brother is so fashion____!

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He took a vow to  smoking.

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Before you enter your card details, make sure it’s a _____________ website.

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You should take regular breaks when using computers so that you don’t ____ your eyes.

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The sales are_____this Monday; I hope I can find that skirt I had my eye on!

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Milan is_____for fashion and shopping.