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Reading comprehension -TOEFL- Lesson 30 (Đọc hiểu -TOEFL- Bài 30)

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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 5 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 10 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 15 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.

20 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 25 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.

1. What does the passage mainly discuss?

2. In line 3, the word "potential" could best be re-placed by which of the following?

3. The word "trigger" as used in line 3 is closest in meaning to which of the following?

4. Which of the following could best replace the word "incidence" as used in line 5?

5. The author uses the word "temporal" in line 9 to mean

6. The phrase "susceptible to" in line 12 could best be replaced by

7. According to the passage, which of the following is NOT a possible cause of many heart attacks?

8. The word "phenomenon" in line 14 refers to which of the following?

9. The word "implicated" in line 21 could best be replaced by which of the following?

10. Which of the following is NOT cited as a possible risk factor?

11. Which of the following does the passage infer?

12. As used in line 22, which of the following could best replace the word "reveal"?

Grammar Easy Grammar Medium Grammar - Difficult
1->25 26->49 50->75 76->99 100->125 126->164
Ôn Tập Ngữ Pháp Phần 1 Ôn Tập Ngữ Pháp Phần 2