Half of the world’s population is affected by Asian monsoons (季风), but monsoons are difficult to predict. American researchers have put together a 700-year record of the rainy seasons, which is expected to provide guidance for experts making weather predictions.
Every year, moist (潮湿的) air masses,known as monsoon,produce large amounts of rainfall in India, East Asia, Northern Australia and East Africa. All this wet air is pulled in by a high pressure area over the Indian Ocean and a low pressure area to the south.
According to Edward Cook, a weather expert at Columbia University in New York, the complex nature of the climate systems across Asia makes monsoons hard to predict. In addition, climate records for the area are too recent and not detailed enough to be of much use. Therefore, he and a team of researchers spent more than fifteen years traveling across Asia, looking for trees old enough to provide long-term records. They measured the rings(年轮), or circles, inside thousands of ancient trees in more than 300 places.
Rainfall has a direct link to the growth and width of rings on some kinds of trees. The researchers developed a document they are calling a Monsoon Asia Drought Atlas. It shows the effect of monsoons over seven centuries, beginning in the 1300s.
Professor Cook says the tree-ring records show periods of wet and dry weather. “If the monsoon basically fails or is a very weak one, the trees affected by monsoons at that location might put on a very narrow ring. But if the monsoon is very strong, the trees affected by that monsoon might put on a wide ring for that year. So, the wide and narrow ring widths of the chronology(大事年表) that we developed in Asia provide us with a measure of monsoon variability.” With all this information, researchers say they can begin to improve computer climate models for predicting the behavior of monsoons.
“There has been widespread famine and starvation and human dying in the past in large droughts. And on the other hand, if the monsoon is particularly heavy, it can cause extensive flooding.” said Eugene Wahl, a scientist with America’s National Oceanic and Atmospheric Administration. “So, to get a sense of what the regional moisture patterns have been, dryness and wetness over such a long period of time in great detail, I would call it a kind of victory for climate science.”
1.What’s the passage mainly about?
A.The effects of Asian monsoons. B.The necessity of weather forecast.
C.The achievements of Edward cook. D.A breakthrough in monsoon prediction.
2.It is difficult for experts to predict Asian monsoons because _______.
A.it is hard to keep long-term climate records.
B.they are formed under complex climate systems.
C.they influence many nations.
D.there is heavy rainfall in Asia.
3.What can be inferred from the passage?
A.Long and detailed climate records can offer useful information for monsoon research.
B.The Monsoon Asia Drought Atlas has a monsoon record for about 1,300 years.
C.The trees affected by monsoon grow fast if the monsoon is weak.
D.The rainfall might be low although the monsoon is strong in monsoon-affected areas.
4.According to Professor Cook, the rings of the trees _______.
A.determine the regional climate.
B.have a great influence on the regional climate.
C.offer people information about the regional climate.
D.reflect all kinds of regional climate information.
5.What do we know about the research according to Eugene Wahl?
A.It is a great achievement in climate science.
B.It should include information about human life in the past.
C.It has analysed moisture models world wide,
D.It will help people prevent droughts and floods.
6.Which of the following best describes the tone of this passage?
A.Matter-of –fact B.Pessimistic C.Humorous D.Friendly.
高三英语阅读理解中等难度题
Half of the world’s population is affected by Asian monsoons (季风), but monsoons are difficult to predict. American researchers have put together a 700-year record of the rainy seasons, which is expected to provide guidance for experts making weather predictions.
Every year, moist (潮湿的) air masses,known as monsoon,produce large amounts of rainfall in India, East Asia, Northern Australia and East Africa. All this wet air is pulled in by a high pressure area over the Indian Ocean and a low pressure area to the south.
According to Edward Cook, a weather expert at Columbia University in New York, the complex nature of the climate systems across Asia makes monsoons hard to predict. In addition, climate records for the area are too recent and not detailed enough to be of much use. Therefore, he and a team of researchers spent more than fifteen years traveling across Asia, looking for trees old enough to provide long-term records. They measured the rings(年轮), or circles, inside thousands of ancient trees in more than 300 places.
Rainfall has a direct link to the growth and width of rings on some kinds of trees. The researchers developed a document they are calling a Monsoon Asia Drought Atlas. It shows the effect of monsoons over seven centuries, beginning in the 1300s.
Professor Cook says the tree-ring records show periods of wet and dry weather. “If the monsoon basically fails or is a very weak one, the trees affected by monsoons at that location might put on a very narrow ring. But if the monsoon is very strong, the trees affected by that monsoon might put on a wide ring for that year. So, the wide and narrow ring widths of the chronology(大事年表) that we developed in Asia provide us with a measure of monsoon variability.” With all this information, researchers say they can begin to improve computer climate models for predicting the behavior of monsoons.
“There has been widespread famine and starvation and human dying in the past in large droughts. And on the other hand, if the monsoon is particularly heavy, it can cause extensive flooding.” said Eugene Wahl, a scientist with America’s National Oceanic and Atmospheric Administration. “So, to get a sense of what the regional moisture patterns have been, dryness and wetness over such a long period of time in great detail, I would call it a kind of victory for climate science.”
1.What’s the passage mainly about?
A.The effects of Asian monsoons. B.The necessity of weather forecast.
C.The achievements of Edward cook. D.A breakthrough in monsoon prediction.
2.It is difficult for experts to predict Asian monsoons because _______.
A.it is hard to keep long-term climate records.
B.they are formed under complex climate systems.
C.they influence many nations.
D.there is heavy rainfall in Asia.
3.What can be inferred from the passage?
A.Long and detailed climate records can offer useful information for monsoon research.
B.The Monsoon Asia Drought Atlas has a monsoon record for about 1,300 years.
C.The trees affected by monsoon grow fast if the monsoon is weak.
D.The rainfall might be low although the monsoon is strong in monsoon-affected areas.
4.According to Professor Cook, the rings of the trees _______.
A.determine the regional climate.
B.have a great influence on the regional climate.
C.offer people information about the regional climate.
D.reflect all kinds of regional climate information.
5.What do we know about the research according to Eugene Wahl?
A.It is a great achievement in climate science.
B.It should include information about human life in the past.
C.It has analysed moisture models world wide,
D.It will help people prevent droughts and floods.
6.Which of the following best describes the tone of this passage?
A.Matter-of –fact B.Pessimistic C.Humorous D.Friendly.
高三英语阅读理解中等难度题查看答案及解析
Half of the world’s population is affected by Asian monsoons(季风), but monsoons are difficult to predict. American researchers have put together a 700-year record of the rainy seasons, which is expected to provide guidance for experts making weather predictions.
Every year, damp air masses,known as monsoon,produce large amounts of rainfall in India, East Asia, Northern Australia and East Africa. All this wet air is pulled in by a high pressure area over the Indian Ocean and a low pressure area to the south.
According to Edward Cook , a weather expert at Columbia University in New York., the complex nature of the climate systems across Asia makes monsoons hard to predict. In addition, climate records for the area are too recent and not detailed enough to be of much use. Therefore, he and a team of researchers spent more than fifteen years traveling across Asia, looking for trees old enough to provide long-term records. They measured the rings, or circles, inside thousands of ancient trees in more than 300 places.
Rainfall has a direct link to the growth and width of rings on some kinds of trees. The researchers developed a document they are calling a Monsoon Asia Drought Atlas. It shows the effect of monsoons over seven centuries, beginning in the 1300s.
Professor Cook says the tree-ring records show periods of wet and dry weather. “If the monsoon basically fails or is a very weak one, the trees affected by monsoons at that location might put on a very narrow ring. But if the monsoon is very strong, the trees affected by that monsoon might put on a wide ring for that year. So, the wide and narrow ring widths of the chronology that we developed in Asia provide us with a measure of monsoon variability.” With all this information, researchers say they can begin to improve computer climate models for predicting the behavior of monsoons.
“There has been widespread famine and starvation and human dying in the past in large droughts. And on the other hand, if the monsoon is particularly heavy, it can cause extensive flooding.” said Eugene Wahl, a scientist with America’s National Oceanic and Atmospheric Administration. “So, to get a sense of what the regional moisture patterns have been, dryness and wetness over such a long period of time in great detail, I would call it a kind of victory for climate science.”
1.What’s the passage mainly about?
A. The effects of Asian monsoons.
B. The necessity of weather forecast.
C. The achievements of Edward cook.
D. A breakthrough in monsoon prediction.
2.It is difficult for experts to predict Asian monsoons because _______.
A. it is hard to keep long-term climate records.
B. they are formed under complex climate systems.
C. they influence many nations.
D. there is heavy rainfall in Asia.
3.What can be inferred from the passage?
A. Long and detailed climate records can offer useful information for monsoon research.
B. The Monsoon Asia Drought Atlas has a monsoon record for about 1,300 years.
C. The trees affected by monsoon grow fast if the monsoon is weak.
D. The rainfall might be low although the monsoon is strong in monsoon-affected areas.
4.According to Professor Cook, the rings of the trees _______.
A. determine the regional climate.
B. have a great influence on the regional climate.
C. offer people information about the regional climate.
D. reflect all kinds of regional climate information.
5.Which of the following best describes the tone of this passage?
A. Matter-of –fact B. Pessimistic C. Humorous D. Friendly.
高三英语阅读理解中等难度题查看答案及解析
The World Wildlife Fund (WWF) says more than half of the world’s wildlife population has been lost, which the conservation group says has placed the health of the planet at risk.
The WWF recently released its 10th Flagship Living Planet Report. The group warns the condition of the world's animals is worse than its earlier reports showed, indicating worldwide action is needed.
The WWF is worried about the loss of and damage to Earth’s environment. The report provides information about more than 10,000 animal populations from 1970 to 2010. These populations are called “vertebrate species,” or animals with backbones — like fish, birds, mammals, amphibians and reptiles. The report shows these populations have dropped by 52 percent in just 40 years. It warns freshwater species have fallen by 76 percent, which is almost twice the loss of land and ocean species. Most of these losses are in the tropics, with the biggest drop in Latin America.
Marco Lambertini, the WWF’s International Director-General said, “This is about losing natural habitats. This is about converting forests, grasslands, and wetlands into agriculture mainly, and it is about unsustainable use of wildlife. Illegal hunting has been actually increasing over the last 10 years, which definitely a driving force for extinction, particularly of large species.”
The report also notes what it calls the world’s “Ecological Footprint”, that is, the effect of human activities on the planet. Mr. Lambertini says there has been an increase in carbon dioxide gases and the pouring of nitrogen into oceans and rivers from fertilizers used in agriculture, which certainly cannot continue.
“We are consuming on average every year about the equivalent of about 1.5, one and a half times the resources available to the planet. That means we are cutting trees more quickly than they can be restored. We are fishing the oceans more quickly than fishing stocks can reproduce, and we are emitting in the atmosphere more CO2 than the natural systems can actually absorb, which is clearly not sustainable.”
Mr. Lambertini warns climate change affects almost everyone on the planet and that whole species may disappear if the world does not reduce the effects of humans on the climate.
1.According to the passage, what kind of species faces the biggest drop in population?
A. Land and ocean species.
B. Animals with backbones.
C. Freshwater species in Latin America.
D. Freshwater species in the tropics.
2.All the following can contribute to the loss of world’s wildlife population EXCEPT ________.
A. turning wildlife habitats into agriculture land.
B. making sustainable use of wildlife.
C. hunting illegally.
D. emitting CO2 gases and pouring nitrogen.
3.Which does the underlined word “converting” in paragraph 4 mean?
A. Conserving. B. Conveying.
C. Exchanging. D. Transforming.
4.It can be inferred from the passage that _______.
A. Marco is much concerned about human’s current behaviors towards wildlife.
B. what the planet provides now can satisfy human’s sustainable development.
C. more than half of the world’s wildlife population has been lost.
D. if humans reduce the effects on the climate, the whole species will not disappear.
高三英语阅读理解中等难度题查看答案及解析
It is estimated that more than half the world’s population is bilingual (双语的), and in an increasingly globalised world, there are obvious benefits of speaking more than one language. However, for many years, parents were advised not to teach their children to speak more than one language from birth. Learning two or more languages simultaneously (同时) was believed to cause confusion and slow down academic development. While it is certainly true that children who are learning to speak more than one language as their mother tongue will often mix the languages up or speak a little later, these are temporary problems, and there is no reason to avoid teaching a child more than one language.
In fact, there are plenty of reasons to encourage your child to become bilingual from birth. As well as the obvious benefits of being able to communicate with more people, and the possibility of earning more money, children who speak more than one language have been shown to score more highly in achievement tests at school. This is true for mathematics as well as tests of verbal (言语的) skills.
And in later life it has been found that bilinguals, on average, will tend to develop Alzheimer’s disease five years later than monolingual speakers. Speaking three or more languages offers even more protection. It seems that the increased number of connections within the brain allows bilinguals to cope better with brain damage.
But is it too late if you haven’t already learned a second language in childhood? It used to be thought that the adult brain was very fixed, but recent research has shown that we continue to develop new connections in the brain throughout our lives, meaning that it’s perfectly possible to learn another language to a high standard. Older learners are less likely to have native-like pronunciation, but they are better at learning vocabulary as they are able to use far more skills and strategies than children. And learning a language is like using a muscle – the more you use it, the stronger it gets, meaning that you will find your third language easier than your second, and so on.
1.Why shouldn’t parents be discouraged from teaching their children to be a bilingual?
A. Children’s confusion over two languages will not last long.
B. Children will not mistake one language for the other.
C. Parents should begin to teach a second language early.
D. Parents’ guidance will help children tell two languages apart.
2.Which of the following is NOT a possible benefit of being a bilingual?
A. A bilingual is less likely to develop Alzheimer’s disease.
B. A bilingual child may do well in mathematics at school.
C. A bilingual will probably make more money.
D. A bilingual child owns relatively good language ability.
3.Compared with children, adult language learners ___________.
A. are slower at learning a second language.
B. are more skilled at building vocabulary.
C. are more likely to acquire a native accent.
D. are slower at making logic connections.
4.What can be learned from the passage?
A. A bilingual child will speak both the languages badly later in his life.
B. Learning a second language certainly contributes to your body fitness.
C. Connections within adults’ brain will permanently stop developing.
D. With each language learned, the learning process will become easier.
高三英语阅读理解中等难度题查看答案及解析
Facebook is now used by 30 million people in the UK, about half the population.
Joanna Shields, vice president of Facebook Europe, made the announcement this morning at a media conference in London.
She said: "We can announce today that we have reached 30 million in the UK, which we are really excited about."
Globally, Facebook has more than 500 million registered users, a milestone it hit last summer. Last July, it also revealed that it had 26 million registered UK users. In the last eight months, it has attracted four million extra UK users, bringing the UK total to 30 million, while in January 2009, Facebook had only 150 million registered users.
Last year, Zuckerberg, Facebook's founder, said it was "almost a guarantee" that the site would hit one billion users. He explained: "If we succeed in innovating, there is a good chance of bringing this to a billion people...it will be interesting to see how it comes true."
One third of women aged 18 to 34 check Facebook when they first wake up, before even going to the toilet, according to research. Twenty-one per cent of women aged between 18 to 34 check Facebook in the middle of the night, while 42 per cent of the same group think it is fine to post drunken photos of themselves onto the social network, a study by Oxygen Media found.
Shields was speaking this morning at the Financial Times Digital Media and Broadcasting Conference about the power Facebook's referrals can bring to media sites, such as newspapers and TV services.
She explained that the average Facebook user has 130 friends who they share links to media sites with on a regular basis. "Media companies which take advantage of that are really seeing the benefits", Shields said.
Shields refused to say whether Facebook would develop its own mobile phone operating system and also said it was "silly" that Google had recently disabled the feature (特点) which allowed Google users to sync their contacts with Facebook friends.
1.What is Joanna Shields content with?
A. the announcement B. media conference
C. fast growing registered users D. the benefits of Facebook
2.How many registered users all over the world now?
A. 26 million B. 30 million
C. 150 million D. more than 500 million
3.Zuckerberg, Facebook's founder, take a more ________ view about the future of Facebook.
A. negative B. optimistic C. cold D. pessimistic
4.What kind of people are more interested in Facebook according to the passage?
A. teenagers B. middle-aged people
C. old people D. young people
5.From the passage we know that ________.
A. Facebook would develop its own mobile phone operating system
B. Google didn't allow its users to sync their contacts with Facebook friends
C. Shields refused to admit the power Facebook's referrals could bring
D. Google was always silly
高三英语阅读理解中等难度题查看答案及解析
Facebook is now used by 30 million people in the UK,about half the population.
Joanna Shields,vice president of Facebook Europe,made the announcement this morning at a media conference in London.
She said: "We can announce today that we have reached 30 million in the UK,which we are really excited about."
Globally,Facebook has more than 500 million registered users,a milestone it hit last summer.Last July,it also revealed that it had 26 million registered UK users.In the last eight months,it has attracted four million extra UK users,bringing the UK total to 30 million,while in January 2009,Facebook had only 150 million registered users.
Last year,Zuckerberg,Facebook's founder,said it was "almost a guarantee" that the site would hit one billion users.He explained: "If we succeed in innovating,there is a good chance of bringing this to a billion people...it will be interesting to see how it comes true."
One third of women aged 18 to 34 check Facebook when they first wake up,before even going to the toilet,according to research.Twenty-one per cent of women aged between 18 to 34 check Facebook in the middle of the night,while 42 per cent of the same group think it is fine to post drunken photos of themselves onto the social network,a study by Oxygen Media found.
Shields was speaking this morning at the Financial Times Digital Media and Broadcasting Conference about the power Facebook's referrals can bring to media sites,such as newspapers and TV services.
She explained that the average Facebook user has 130 friends who they share links to media sites with on a regular basis."Media companies which take advantage of that are really seeing the benefits",Shields said.
Shields refused to say whether Facebook would develop its own mobile phone operating system and also said it was "silly" that Google had recently disabled the feature(特点)which allowed Google users to sync their contacts with Facebook friends.
1.What is Joanna Shields content with?
A.the announcement
B.media conference
C.fast growing registered users
D.the benefits of Facebook
2.Zuckerberg,Facebook's founder,take a more view about the future of Facebook.
A.negative B.optimistic
C.cold D.pessimistic
3.What kind of people are more interested in Facebook according to the passage?
A.teenagers B.middle-aged people
C.old people D.young people
4.From the passage we know that .
A.Facebook would develop its own mobile phone operating system
B.Google didn't allow its users to sync their contacts with Facebook friends
C.Shields refused to admit the power Facebook's referrals could bring
D.Google was always silly
高三英语阅读理解中等难度题查看答案及解析
It is believed that around half the US adult population will be obese (肥胖的) by 2030, while one in four will fall into the severely obese category. This is according to a new study led by the Harvard T.H. Chan School of Public Health, which found that levels of obesity are increasing in every state. Indeed the predictions show that levels of severe obesity could be higher than 25 percent in half of states.
“Especially striking was our finding that among adults with very low income (less than $20,000 per year), severe obesity is predicted to be the most common in 44 states—almost everywhere in the US,” a researcher said.
The research was carried out to inform state policymakers—and perhaps help change the tendency. The study authors say the best form of attack is prevention. Limiting intake of sugar is stressed as one of the most effective and cost-effective methods for reducing obesity levels, and a tax likely to save more money than it costs.
Sugar (and the sugar industry) has come under fire for its role in promoting obesity. Indeed, one recent study published in September 2019 puts responsibility for today’s obesity epidemic (流行病) firmly on the shoulders of sugar, concluding high-sugar diets during childhood in the seventies and eighties could be behind the rise.
“We knew from previous work that obesity is increasing in the US, and that some states and demographic groups (人群) are at higher risk, but we were surprised that even the states with the lowest obesity will be above 35 percent in 2030—a level currently considered high, a researcher told Newsweek. What is clear is that we will not be able to treat our way out of this epidemic—achieving and keeping weight loss is difficult—so prevention efforts will be key to making progress in this area.”
1.What’s the most surprising finding in the study?
A.Over 25% of people will be seriously obese.
B.Levels of obesity are increasing in every state.
C.poor adults are more likely to be severely obese.
D.Half of the US adults will be overweight by 2030.
2.What is the best way to solve the problem according to the passage?
A.To reduce the tax. B.To limit intake of sugar.
C.To reduce obesity level. D.To inform policymakers.
3.What does the underlined word “fire” actually refer to in paragraph 4?
A.Blame from researchers. B.Rapid chemical change.
C.Current obesity epidemic. D.High-sugar diets.
4.What’s the main idea of the last two paragraphs?
A.Obesity is increasing everywhere in the US.
B.All states in America are at the same level of obesity.
C.Maintaining weight loss is a good way to deal with obesity.
D.Diets with less sugar are vital to preventing the problem of obesity.
高三英语阅读理解困难题查看答案及解析
10. By the middle of the 21st century , the vast majority of the world’s population ________ in cities rather than in the country.
A.are living | B.will be living | C.have lived | D.will have lived |
高三英语单项填空简单题查看答案及解析
According to a report by the United Nations,54 percent of the world’s population lives in urban areas and it predicts that by 2050,this figure will have increased to around 70 percent.But as more and more people migrate from the countryside to the city to get better opportunities,they can end up with nowhere to live.
This is true in places such as Rio de Janeiro,where migrants can’t rent or buy a home,and they end up building their own communities and houses on unoccupied land.These are called shanty towns—poor communities where the houses are built out of cheap materials—and often don’t have any electricity or water supply.
These are,of course,not the megacities(大城市)of the future we want to see. Some serious urban planning is needed to make our cities of the future good,safe and modern places to live in. This involves improving the infrastructure(基础设施),the housing conditions and also the opportunities for education and employment.
Something urban planners are looking at now is the creation of “smart cities”. According to John Rossant,founder and chairman of the non-profit organization New Cities Foundation ,technology is the way forward.He thinks that it’s generally accepted that“cloud computing, ubiquitous internet,robust 5G networks,etc,will transform our cities.” He says technology is really “a game changer” in urbanisation. It would collect large amounts of data about how a city is performing and may improve how a city functions.
This may sound like a utopian(乌托邦似的)view. For now,some big cities around the world are trying out more low—tech schemes to try and make them desirable places to live and work in. Building shared—ownership housing and improving public transport are some ways. And encouraging cycling and building bike lanes can keep the population healthy and cut down on smog. What would make your city a better place to live in?
1.What’s the text mainly about?
A.The city of the future. B.The increase of the population.
C.Urban construction. D.The function of smart cities.
2.Why does the author mention Rio de Janeiro in Paragraph 2?
A.To show the growth of the world population.
B.To show the problems in urbanization.
C.To show poor living conditions of the city.
D.To show financial trouble of the city.
3.What plays an important role in the creation of smart cities?
A.Technology. B.Urban planning.
C.The infrastructure of the city. D.Opportunities for education.
4.What can we know from the last paragraph?
A.High-tech plans can be easily realized.
B.Public transport is well developed in cities.
C.Shared-ownership houses make no sense.
D.Ways of low-tech are available at present.
高三英语阅读理解中等难度题查看答案及解析
WASHINGTON—Two-thirds of the world’s polar bear population could be gone by 2050 if predictions of melting sea ice hold true, the US Geological Survey reported on Friday.
The fate of polar bears could be even worse than that estimate, because sea ice in the Arctic might be disappearing faster than the available computer models predict, the geological survey said in a report aimed at determining whether the big white bear should be listed as a threatened species.
“There is a definite link between changes in the sea ice and the welfare of polar bears,” said Steve Amstrup, who led the research team. He says Arctic sea ice is already at the lowest this year and is expected to retreat(退却) farther this month.
That means that polar bears—some 16,000 of them -- will disappear by 2050 from parts of the Arctic where sea ice is melting most rapidly, along the north coasts of Alaska and Russia, researchers said in a telephone briefing(简报).
Other polar bears could survive beyond that date but many of those could be gone by 2100, Amstrup said. By this century’s end, the only polar bears left might live in the Canadian Arctic islands and along the west coast of Greenland.
“It is likely to result in loss of approximately two-thirds of the world’s current polar bear population by the mid 21st century,” the report’s executive summary said.
“Because the observed trajectory(轨迹)of Arctic sea ice decline appears to be underestimated by currently available models, this assessment of future polar bear status may be conservative(保守的).”
In January, the US Fish and Wildlife Service proposed listing the polar bear as a threatened species, noting polar bears depend on sea ice as a platform to hunt seals, their main food.
Without enough sea ice, polar bears would be forced onto land, but they are poor hunters once they get out of the water and ice, the researchers said. The bears’ disappearance would probably take place as young cubs(幼兽)failed to survive to adulthood and females were unable to reproduce successfully.
1.What was the US Geological Survey intended to do?
A.To determine whether the polar bear was in danger.
B.To measure how fast the sea ice melts in the Arctic.
C.To check the predictions of the computer models.
D.To find out the exact number of the polar bear.
2.What causes the polar bears to disappear by 2050?
A.The pollution of the Arctic region. B.The sea ice melting at high speed
C.Fewer food sources being left. D.The temperature getting colder.
3.The key to preventing polar bears dying out seems to _______________.
A.help young polar bears to survive the cold winter
B.have large number of seals living in the oceans
C.make sure there is enough sea ice in the Arctic
D.provide chances for adult polar bears to reproduce
高三英语阅读理解中等难度题查看答案及解析