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题型:阅读理解-阅读单选 难度:0.65 引用次数:214 题号:12549723

Some people must carefully pay attention to everything they put in their mouths in order to control their weight. By contrast, others can eat French fries to their hearts' content and achieve the same result. How do some people manage never to gain weight?

"Perception, one of the most important factors, has nothing to do with the body type because our personal feeling is always wrong. We often feel that some people who eat more don't put on weight. Actually? those who appear to eat whatever they like without gaining weight aren't eating more than the rest of us," said professor Kathleen Melanson. "For example, your friend who eats ice cream on a daily basis might eat less at another meal- or snack less throughout the rest of the day.”

“Physical activity can also make a difference, but it doesn't have to be a gym workout. There's little evidence to suggest that—without exercise-some people were born to burn significantly more calories than others," said Dr Ines Barroso, a researcher at the University of Cambridge. But there may be physical differences that allow some people to naturally control the number of calories they consume without exercising much self-regulation.

A lot of nervous system signals and hormones (激素)that circulate in our blood interact to tell us when we're hungry or full. This is called the appetite regulatory system, and it may be more sensitive in some people than others, Melanson said. One important hormone involved in this system is leptin (瘦素).It helps regulate how much food we want to eat over longer periods of time, not just for our next meal. So a person with a more sensitive system might go back for seconds and thirds at a party, then feel full for the next few days and eat less.

Genetics can also play a role in a person's tendency to gain or lose weight. Researchers have identified over 250 different regions of DNA that are associated with obesity, according to a 2019 study published in PLOS Genetics.

1. What does the underlined word “Perception" in paragraph 2 probably mean?
A.Connection.B.Sense.C.Defense.D.Reduction.
2. What do we know about leptin?
A.It makes people usually feel hungry.
B.It helps people have a better appetite.
C.It helps people regulate their food intake.
D.It makes people more sensitive to the flavour of food.
3. What do the findings of the 2019 study show?
A.Weight problems can be avoided.
B.Losing weight is equally difficult for everyone.
C.Some people may be born to have weight problems.
D.Genes can be completely changed to avoid weight problems.
4. What is the author's main purpose in writing the text?
A.To share some ideas about how to lose weight.
B.To explain why some people never gain weight.
C.To advise people to control their daily diet strictly.
D.To call for people to pay attention to healthy eating.

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【推荐1】American researchers say they have found the strongest link yet between ozone pollution and damage to health. Their findings show that short-term increases in ozone lead to higher death rates in cities.

Ozone is a form of oxygen. The gas is produced naturally in the upper atmosphere to protect the Earth against radiation from the sun. But human activity can also create ozone in the lower atmosphere. Gasses from vehicles and industry react with sunlight to form this ozone. Levels usually increase in the warmer months. Ozone is the main chemical in smog, the air pollution that is a combination of fog and smoke.

Ozone has been linked to heart and lung problems especially, and to higher rates of hospital cases. Researchers from Yale University and Johns Hopkins University did the study. Michelle Bell of Yale was the lead researcher. The Journal of the American Medical Association published the results. The researchers collected information on 95 American cities. These contain about 40% of the national population. The study compared deaths rates to ozone levels between 1987 and 2000. The research suggests that even a small increase in ozone, ten parts per thousand million, can lead to higher death rates the following week. The study found that the average daily number of deaths rose point-five percent. Heart and lung related deaths rose point-six percent. And deaths among older people rose point-seven percent.

The study is one of the largest ever done of ozone and death rates. The researchers note that ozone is widespread in the United States and many other countries. The United States Environmental Protection Agency is re-examining its air pollution rules. The current limit for ozone is eighty parts per thousand million for an eight-hour period. Limits were higher in the past. But the researchers say they found an increase in deaths even below the current levels.

1. What can we know about the smog from Paragraph 2?
A.It is made up of water. B.It can make the air clean.
C.Ozone is only a small part in it. D.It is polluted air including fog and smoke.
2. What can we learn from the study?
A.The study placed the time between 1987 and 2000.
B.The old are easier to suffer from an increase in ozone.
C.The collected information is from 40% of American cities.
D.A small increase in ozone can't cause higher death rates.
3. What can we infer from the passage?
A.The present ozone level in America is safe to people.
B.There is no direct connection between ozone and death rates.
C.The study of ozone and death rates has been done several times.
D.America has a worse problem with ozone than other countries.
4. Which of the following can be the best title for the text?
A.Is ozone linked to heart and lung problems?
B.Can ozone levels cause environment to go worse and worse?
C.How can death rate be reduced by protecting environment?
D.What is the connection between death rates and ozone levels?
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【推荐2】A recent analysis from the Physicians Committee for Responsible Medicine highlights the benefits of replacing animal products with plant-based foods. This analysis, which amplifies a previous study by the same committee, further emphasizes the significant impact of plant-based diets on weight loss, cholesterol (胆固醇) and fat intake in overweight adults.

The most significant finding is that both healthy and unhealthy plant-based foods contribute to weight loss when they replace animal products in the diet. This conclusion is significant because it underlines the potential of a plant-based diet, regardless of the specific type of plant-based foods consumed, in managing weight and improving overall health.

This analysis is a secondary examination of a prior study that involved 244 overweight adults. The participants were divided into two groups. The first group followed a low-fat vegan (素食的) diet, and the second made no changes to their diet. Obviously, the study set no restrictions on calorie intake, and the researchers did not give participants specific instructions on diet quality.

The study authors used two different indexes (指标) to assess: the healthful plant-based diet index (hPDI), and the unhealthful plant-based diet index (uPDI). The hPDI emphasizes fruits, vegetables, grains, and beans, while the uPDI includes more refined grains and fruit juices. Higher scores on the indexes correlate with greater consumption of plant-based foods and reduced consumption of animal products.

The results revealed that after 16 weeks, participants on the vegan diet showed increased scores in both indexes. This increase significantly correlated with participants losing an average of about 13 pounds, mainly from reduced fat mass. The second group showed no change in their index scores.

Overall, the analysis provides strong evidence that eating plant-based foods is effective for weight management and health improvement.

1. What does the underlined word “amplifies” mean in paragraph 1?
A.Abuse.B.Expand.C.Launch.D.Classify.
2. What is paragraph 2 mainly about?
A.The causes of putting on weights.B.The key insight on plant-based foods.
C.The significance of managing weights.D.The specific types of plant-based foods.
3. How is the study conducted?
A.By improving participants’ diet quality.
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C.By monitoring participants’ calorie intake.
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4. What can we know from the study?
A.Being on diet is the key to losing weight.
B.All plant products are beneficial to health.
C.Plant-based foods show promising results.
D.Animal products have no effect on weight.
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2. The underlined word “accessing” in the third paragraph can be replaced by “________”.
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