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Choice of Lesson (Bấm chuột vào ô sổ xuống bên dưới và chọn bài kiểm tra)
A team of Russian scientists has challenged the theory that the woolly mammoths became extinct 10,000 years ago at the end of the Ice Age. The scientists have reported that the beasts may have survived until 2000 B.C. on an island off the coast of Siberia, where researchers 5 uncovered 29 fossilized woolly mammoth teeth ranging in age from 4,000 to 7,000 years. The question to be asked now is, how did these prehistoric pachyderms survive in their island environment? One possibility is that they adapted to their confined surroundings by decreasing their bulk. This theory is based on their smaller tooth size, which 10 has led scientists to believe that they were only 6 feet tall at the shoulder compared with 10 feet of their full-sized counterpart. But would this be enough to enable them to survive thousands of years beyond that of other mammoths? Researchers are still working to uncover the reasons for this isolated group's belated disappearance.
1. With which topic is this passage mainly concerned?
2. According to the passage, some researchers suggest that mammoths became extinct
3. The word "woolly" as used in line 1 refers to the animal's
4. The word "uncovered" as used in line 5 is closest in meaning to which of the following?
5. The word "adapted" in line 8 could best be replaced with
6. In line 8, the word "confined" could best be replaced by
7. The author uses the word "counterpart" in line 11 to refer to
8. The word "enable" in line 12 could best be replaced by which of the following?
9. The word "belated" in line 14 is closest in meaning to which of the following?
10. According to the scientists, the woolly mammoths may have managed to survive because they
11. According to the passage, the reason for the disappearance of the mammoths on the island is
12. Which of the following terms from the passage is NOT used to refer to the mammoths?
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?
Lead poisoning in children is a major health concern. Both low and high doses of paint can have serious effects. Children exposed to high doses of lead often suffer permanent nerve damage, mental retardation, blindness, and even death. Low doses of lead can lead to mild mental 5 retardation, short attention spans, distractibility, poor academic performance, and behavioral problems.
This is not a new concern. As early as 1904, lead poisoning in children was linked to lead-based paint. Microscopic lead particles from paint 10 are absorbed into the bloodstream when children ingest flakes of chipped paint,plaster,or paint dust from sanding. Lead can also enter the body through household dust, nailbiting, thumb sucking, or chewing on toys and other objects painted with lead-based paint. Although American paint companies today must comply with strict regulations 15 regarding the amount of lead used in their paint, this source of lead poisoning is still the most common and most dangerous. Children living in older, dilapidated houses are particularly at risk.
1. What is the main topic of the passage?
2. Which part of the passage discusses symptoms and consequences of lead poisoning?
3. The phrase "exposed to" in line 2 could best be replaced by which of the following?
4. As used in line 3, which of the following is closest in meaning to the word "suffer"?
5. Which of the following does the passage infer?
6. Which of the following is closest in meaning to the phrase "linked to" in line 9?
7. The word "absorbed" in line 10 could best bereplaced by
8. In line 10, the word "ingest" could best be replaced by which of the following?
9. Which of the following is closest in meaning to the word "chipped" as used in line 11?
10. In line 17, the word "dilapidated" is closest in meaning to which of the following?
11. According to the passage, what is the most common source of lead poisoning in children?
12. What does the author imply in the final sentence of the passage?
Our eyes and ears might be called transformers since they sense the light and sound around us and turn them into electrical impulses that the brain can interpret. These electrical impulses that have been transformed by the eye and ear reach the brain and are turned 5 into messages that we can interpret. For the eye, the process begins as the eye admits light waves, bends them at the cornea and lens, and then focuses them on the retina. At the back of each eye, nerve fibers bundle together to form optic nerves, which join and then split into two optic tracts. Some of the fibers cross, so that part 10 of the input from the right visual field goes into the left side of the brain, and vice versa. The process in the ear is carried out through sensory cells that are carried in fluid-filled canals and that are extremely sensitive to vibration. Sound that is transformed into electricity travels along nerve fibers in the auditory nerve. 15 These fibers form a synopsis with neurons that carry the messages to the auditory cortex on each side of the brain.
1. According to the author, we might call our eyesand ears "transformers" because
2. Which of the following is closest in meaning to the word "admits" in line 6?
3. In line 6, what does the word "them" refer to?
4. The word "bundle" in line 8 could best be replaced by which of the following?
5. The word "split" as used in line 9 is closest in meaning to which of the following?
6. Which of the following is closest in meaning to the word "cross" as used in line 9?
7. According to the passage, when input from the right visual field goes into the left side of the brain, what happens?
8. The phrase "carried out" in line 11 could best be replaced by which of the following?
9. Which of the following is most similar to the word "vibration" as used in line 13?
10. According to the passage, optic nerves eventually
Franklin D. Roosevelt, the 32nd president of the United States, was from a wealthy, well-known family. As a child, he attended private school, had private tutors, and traveled with his parents to Europe. He attended Harvard University, and afterward studied law. At age 5 39 Roosevelt suddenly developed polio, a disease that left him without the full use of his legs for the rest of his life. Even through the worst of his illness, however, he continued his life in politics. In 1924 he appeared at the Democratic National Convention to nominate Al Smith for president, and eight years after that he himself was 10 nominated for the same office. Roosevelt was elected to the presidency during the Great Depression of the 1930s, at a time when more than 5,000 banks had failed and thousands of people were out of work. Roosevelt took action. First he declared a bank holiday that closed all the banks so no more could fail; then he reopened the banks little 15 by little with government support. Roosevelt believed in using the full power of government to help what he called the "forgotten people." And it was these workers, the wage earners, who felt the strongest affection toward Roosevelt. There were others, however, who felt that Roosevelt's policies were destroying the American system of 20 government, and they opposed him in the same intense way that others admired him.
In 1940 the Democrats nominated Roosevelt for an unprecedented third term. No president in American history had ever served three terms, 25 but Roosevelt felt an obligation not to quit while the United States' entry into World War II was looming in the future. He accepted the nomination and went on to an easy victory.
1. What does the passage mainly discuss?
2. Which one of the following statements is NOT mentioned in the passage?
3. The phrase "took action" in lines 13 is used to illustrate the idea that Roosevelt
4. As used in line 14-15, the phrase "little by little" means that Roosevelt
5. The word "full" in line 16 could best be replaced by which of the following?
6. Where in the passage does the author discuss Roosevelt's response to the Great Depression?
7. The word "affection" as used in line 18 could best be replaced by which of the following?
8. The word "unprecedented" in line 23 could best be replaced by
9. It can be inferred from the passage that the people who liked Roosevelt best were
10. In line 26, the author uses the word "looming" to indicate a feeling of
