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Reading comprehension -TOEFL- Lesson 24 (Đọc hiểu -TOEFL- Lesson 24)

Reading and answers the question:

Although they are an inexpensive supplier of vitamins, minerals, and high-quality protein, eggs also contain a high level of blood cholesterol, one of the major causes of heart disease. One egg yolk, in fact, contains a little more than two-thirds of the suggested daily cholesterol 5 limit. This knowledge has caused egg sales to plummet in recent years, which in turn has brought about the development of several alternatives to eating regular eggs. One alternative is to eat substitute eggs. These egg substitutes are not really eggs, but they look somewhat like eggs when they are cooked. They have the advantage of having 10 lower cholesterol rates, and they can be scrambled or used in baking. One disadvantage, however, is that they are not good for frying, poaching, or boiling. A second alternative to regular eggs is a new type of egg, sometimes called "designer" eggs. These eggs are produced by hens that are fed low-fat diets consisting of ingredients such 15 as canola oil, flax, and rice bran. In spite of their diets, however, these hens produce eggs that contain the same amount of cholesterol as regular eggs. Yet, the producers of these eggs claim that eating their eggs will not raise the blood cholesterol in humans.

20 Egg producers claim that their product has been portrayed unfairly. They cite scientific studies to back up their claim. And, in fact, studies on the relationship between eggs and human cholesterol levels have brought mixed results. It may be that it is not the type of egg that is the main determinant of cholesterol but the person who 25 is eating the eggs. Some people may be more sensitive to cholesterol derived from food than other people. In fact, there is evidence that certain dietary fats stimulate the body's production of blood cholesterol. Consequently, while it still makes sense to limit one's intake of eggs, even designer eggs, it seems that doing this without regulating 30 dietary fat will probably not help reduce the blood cholesterol level.

1. What is the main purpose of this passage?




2. As used in line 5, the word "plummet" refers to which of the following?




3. According to the passage, which of the following is a cause of heart disease?




4. As used in line 8, which of the following could best replace the word "somewhat"?




5. According to the passage, what has been the cause for changes in the sale of eggs?




6. According to the passage, one egg yolk contains approximately what fraction of the suggested daily limit for human consumption of cholesterol?




7. As used in line 20, the word "claim" means




8. The word "portrayed" in line 20 could best be replaced by which of the following?




9. As used in line 21, what is the meaning of thephrase "back up"?




10. What does the author mean by the phrase "mixed results" in line 23?




11. According to the passage, egg substitutes cannot be used to make any of the following types of eggs EXCEPT




12. According to the author, which of the following may reduce blood cholesterol?





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