45. A. popular B. paralyzed C. disabled D. confident
Reading passage:
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
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 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.
Bạn đang xem 45. - Bộ đề thi thử THPT Quốc gia năm 2016 môn Tiếng Anh - Số 21