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题型:阅读理解-阅读单选 难度:0.65 引用次数:127 题号:12419585

Zika virus. Malaria. West Nile virus. Dengue fever. Have you ever heard of these illnesses? If so, you likely know what they all have in common. These are a few of the diseases spread by one of the greatest pests known to humankind一the mosquito.

Much of the time, mosquito bites are just itchy. Nothing ruins a backyard barbecue faster than a mass of these bloodsucking insects. However, some mosquitoes carry viruses that cause deadly ilnesses. In fact, some experts say mosquitoes are a bigger threat to human life than any other organism.

Over the centuries, mosquitoes are thought to have caused the deaths of 52 billion people. That’s half the people who have ever lived on Earth! Even today, ilnesses spread by mosquitoes kill more people each year than war does.

It should be no surprise that many people would like to get rid of mosquitoes. What if we could wipe out the entire mosquito population? No more malaria. No more Zika. No more itchy bumps after a summer day spent outdoors. Doesn’t that sound great?

Not so fast. Sure, some species of mosquitoes harm humans. But others don’t pose any threat at al! In fact, some of these mosquitoes play important parts in their ecosystems. Let’s look at a few ways.

Many of our Wonder Friends already know that bees play an important part in pollination(授粉). It turns out, mosquitoes do, too! Most mosquitoes actually drink nectar( 花蜜) instead of blood. When they do so, they help pollinate the plants they feed on.

It’s also important to remember that even mosquitoes are part of an ecosystem. Without them, the food chain would be disturbed.

Adult mosquitoes are a food source for bats, birds, spiders, and small mammals. Without them, these animals would need to find something else to eat. Some experts even think mosquitoes could be used to help humans.

1. What do Zika virus, Malaria, West Nile virus, and Dengue fever have in common?
A.They are all pests from the wild forest.B.They can not be cured by human beings.
C.They can all be spread by mosquitoes.D.They are all caused by bacteria.
2. What does the underined phrase in the fourth paragraph mean?
A.Kill something completely.B.Bring up in large numbers.
C.Control something completely.D.Rely on something completely.
3. What is the author’s attitude towards mosquitoes?
A.Positive.B.Negative.C.Critical.D.Objective.
4. What may the author continue to write about in the following?
A.How mosquitoes are harmful to human beings.
B.How mosquitoes are helpful to human beings.
C.How mosquitoes cause various ilness to mankind.
D.How mosquitoes are eaten by small mammals.

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阅读理解-阅读单选(约370词) | 适中 (0.65)
文章大意:本文是一篇说明文,主要讲的是根据调查研究,在过去的一个世纪里,世界上的人们都长高了。

【推荐1】People have grown taller over the last century, with South Korean women shooting up by more than 20cm on average, and Iranian men gaining 16. 5cm. A global study looked at the average height of 18-year-olds in 200 countries between 1922 and 2022.

The results reveal that while Swedes were the tallest people in the world in 1922, Dutch men have risen from 12th place to claim top spot with an average height of 182. 5cm. Latvian women, meanwhile, rose from 28th place in 1922 to become the tallest in the world a century later, with an average height of 169. 8cm.

James Bentham, a co-author of the research from Imperial College, London, says the global trend is likely to be due primarily to improvements in nutrition and healthcare. “An individual’s genetics has a big influence on their height, but once you average over whole populations, genetics plays a less key role. ”he added.

A little extra height brings a number of advantages, says Elio Riboli of Imperial College. “Being taller is associated with longer life expectancy, ” he said. “ This is largely due to a lower risk of dying of cardiovascular (心血管的)disease among taller people. ”

But while height has increased around the world , the trend in many countries of north and sub-Saharan Africa causes concern, says Riboli. While height increased in Uganda and Niger during the early 20th century, the trend has reversed in recent years, with height decreasing among 18-year-olds.

“One reason for these decreases in height is the economic situation in the 1980s, ”said Alexander Moradi of the University of Sussex. The nutritional and health crises that followed the policy of structural adjustment, he says, led to many children and teenagers failing to reach their full potential in terms of height.

Bentham believes the global trend of increasing height has important implications. “How tall we are now is strongly influenced by the environment we grew up in, ” he said. “If we give children the best possible start in life now, they will be healthier and more productive for decades to come. ”

1. What does the global study tell us about people’s height in the last hundred years?
A.There is a remarkable difference across continents.
B.There has been a marked increase in most countries.
C.The speed of increase in people’s height has been quickening.
D.The general increase in women’s height is bigger than in men’s.
2. What does James Bentham say about genetics in the increase of people’s height?
A.It counts less than generally thought.
B.It outweighs nutrition and healthcare.
C.It impacts more on an individual than on a population.
D.It plays a more significant role in females than in males.
3. What does Elio Riboli say about taller people?
A.They tend to live longer.
B.They enjoy an easier life.
C.They risk fewer cancers.
D.They have greater expectations in life.
4. What does the underlined word in paragraph 5 mean?
A.backspunB.risenC.confirmedD.stabilized
2023-03-25更新 | 91次组卷
阅读理解-阅读单选(约330词) | 适中 (0.65)
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【推荐2】Learning a second language is tough at any age. Now, in a new study, scientist have found out the exact age after which your chances of reaching fluency(流利)in a second language seem to plummet:10.

The study published in the journal Cognition, found that it's "nearly impossible" for language learners to reach native-level(母语水平)fluency if they start learning a second language after age 10. "It turns out you're still learning fast," says study co-author Joshua Hartshorne. "It's just that you run out of time, because your ability to learn starts dropping at around 17 or 18 years old," People who start a few years after age 10 may still become quite good at a language, the authors say, but they are unlikely to become fluent.

Kids may be better than adults at learning new languages for many reasons. Children's brains are more plastic than those of adults, meaning they're better able to adapt and respond to new information. Kids may also be more willing to try new things than adults are. Their comparatively new understanding of their native language may also be advantageous.

These findings may seem discouraging, but it was inspiring for scientists to learn that the key period for fluent language learning might be longer than previously thought. Some scientists believed that the window begins to close shortly after birth, while others made it longer to very early childhood. Compared with those judgments-age 17 or 18 —when language learning ability start to drop off—seems relatively old.

For this study, the researchers created an online test promising to guess people's native language and home country based on their responses to English grammar questions. Almost 670,000 people took it, giving the researchers huge amounts of data from English speakers of many ages and backgrounds. Examining the responses and grammar mistakes allowed them to made unusually exact judgments about language learning.

1. What does the underlined word "plummet" in paragraph 1 mean?
A.Drop sharply.B.Increase greatly.
C.Appear gradually.D.Double suddenly.
2. What can we learn from the study?
A.Adults tend to perform badly in learning a second language.
B.Children are at an advantage in acquiring a new language.
C.All these new findings are quite discouraging for scientists.
D.People have different key periods for mastering a language.
3. What does the last paragraph mainly focus on?
A.The purpose of the study.B.The findings of the study.
C.The subject of the study.D.The process of the study.
4. What's the best title of the text?
A.Kids Are Better at Learning New Languages
B.Adults Can't Learn a Second Language Well
C.Never Say Die When Learning a New Language
D.Better to Learn a New Language Before Age 10
2020-08-15更新 | 209次组卷
阅读理解-任务型阅读(约700词) | 适中 (0.65)
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【推荐3】“HELL is a city much like London,” said Percy Bysshe Shelley in 1819. Modern academics agree. Last year Dutch researchers showed that city dwellers (居民) have a 21% higher risk of suffering from anxiety disorders than do their calmer rural countrymen, and a 39% higher risk of suffering from mood disorders. But exactly how the inner workings of the urban and rural minds cause this difference has remained unclear—until now. A study just published in Nature by Andreas Meyer-Lindenberg of the University of Heidelberg and his colleagues has used a scanning technique called functional magnetic-resonance imaging (机能性磁共振成像,简称fMRI) to examine the brains of city dwellers and countrymen when they are under stress.

In Dr Meyer-Lindenberg’s first experiment, participants lying with their heads in a scanner took maths tests that they were bound to fail (the researchers had designed success rates to be just 25-40%). To make the experience still more embarrassing, the team provided negative feedback through headphones, all the while checking participants for indications of stress, such as high blood pressure.

The city people’s general mental health did not differ from that of the rural countrymen. However, their brains dealt with the stress caused by the experimenters in different ways. These differences were noticeable in two regions: the amygdalas (杏仁核) and the perigenual anterior cingulate cortex (前扣带皮层,简称pACC).

People living in the countryside had the lowest levels of activity in their amygdalas. Those living in towns had higher levels. City dwellers had the highest. In the case of the pACC, however, what mattered was not where someone was living now, but where he or she was brought up. The more urban a person’s childhood, the more active his pACC, regardless of where he was dwelling at the time of the experiment.

The amygdalas thus seem to respond to the here-and-now while the pACC is programmed early on, and does not react in the same, flexible way as the amygdalas. Second-to-second changes in its activity might, though, be expected to be connected with changes in the amygdalas, because of its role in regulating them. fMRI allows such connections to be measured.

In the cases of those brought up in the countryside, regardless of where they now live, the connections were as expected. For those brought up in cities, however, these connections broke down. The regulatory mechanism of the native urbanite, in other words, seems to be out of order.

Dr Meyer-Lindenberg and his team conducted several more experiments to check their findings. They asked participants to complete more maths tests—and also tests in which they were mentally ups and downs—while investigators scolded them about their performance. The results matched those of the first test. They also studied another group of volunteers, who were given stress-free tasks to complete. These experiments showed no activity in either the amygdalas or the pACC, suggesting that the earlier results were indeed the result of social stress rather than mental effort.

As is usually the case in studies of this sort, the sample size was small and the result showed an association, rather than a definite, causal relationship. That association is, nevertheless, interesting. Living in cities brings many benefits, but Dr Meyer-Lindenberg’s work suggests that Shelley and his fellow Romantics had at least half a point.

Title: Do urban brains behave differently from rural ones?

Purpose of the research

The research was conducted to explain why city dwellers are more likely to     1     serious disorders than countrymen.

Process of the research

Design of the research

The researchers made the participants take difficult maths tests and provided negative feedback, which served as the source of     2     for the participants.

Meanwhile the researchers scanned their brains and got indications by a scanning technique called fMRI .

Findings of the research

The activity level in the amygdalas is highest in city dwellers,     3     by those living in towns and the countryside. Besides, the amygdalas respond     4    .

The activity level of a person’s pACC, regulating the amygdalas, is     5     by the place where he was raised, and the pACC works when a person is at a     6     age.

The association between the amygdalas and the pACC depends on a person’s living     7    .

    8     on the findings

Several more experiments were carried out with     9     results.

Conclusion of the research

It is the social stress rather than mental effort that leads to mental disorders, so living in cities also brings some     10    .

2017-06-18更新 | 30次组卷
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