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题型:阅读理解-阅读单选 难度:0.65 引用次数:41 题号:21829220

Skyscrapers (摩天大楼) are the symbol of urban life and city people are used to seeing tall buildings and apartments. Farms, on the other hand, are associated with rural life. However, there are experts who think skyscrapers should become farms to meet the increasing food needs.

By the middle of this century, some scientists suggest, almost 80% of the earth’s population could live in cities. In addition, the population could increase to 9.1 billion people during that time yet the amount of land available for farming will be the same. If current farming practices don’t change, we will need an area of new land to produce enough food for the planet.

Vertical farms, where urban farmers could grow crops in environmentally friendly skyscrapers, could be the solution. In spite of concerns over high costs, experts want to make it a reality and use these skyscrapers to grow crops.

Vertical farms would have many advantages, supporters say. Unlike traditional farming, vertical farming could be free of chemicals and diseases. Besides, crops would not suffer from problems like flooding. Finally, vertical farms would reduce the cost and negative effects of transporting food over long distances.

Some argue that although crops growing in a tall glass building would get natural sunlight during the day, it wouldn’t be enough. For this reason, vertical farms would need additional light sources, such as artificial light.

Another way of growing fresh food is to build urban farms on rooftops. This more practical approach may be more achievable than the idea of farms in skyscrapers, researchers suggest. Experts agree that innovative farming practices are needed to support the need for more food at affordable costs, both to the farmer and to the consumer, but the best ideas could be yet to come.

1. What primary problem could vertical farming settle?
A.Poor state of rural life.B.Shortage of food supply.
C.High costs for transporting crops.D.Environmental pollution.
2. What is the advantage of vertical farming?
A.It can benefit transport industry.B.It requires little care.
C.It can produce organic food.D.It needs very low cost.
3. What is a big challenge to make vertical farming a reality?
A.Farmable land.B.Light sources.
C.Crop diseases.D.Climate conditions.
4. What can be the best title of the text?
A.Future Food NeedsB.Symbol of Urban Life
C.Farms of the FutureD.Farming on Rooftops
【知识点】 说明文 可持续农业

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【推荐1】Rather than building new homes to help satisfy housing markets, a new study says that taxing empty homes in big cities could increase housing affordability for local residents while generating income for the governments.

During the past 20 years, housing affordability has decreased significantly in the UK due to a rapid increase in prices relative to earnings. This may be due to foreign investors buying properties in cities such as London, or from British citizens in the countryside buying second homes in the city, which reduces the availability of affordable housing for local residents.

This means that local citizens who actually live in the city are forced to pay more money for housing in neighborhoods that are filled with homes that are unoccupied for more than half of the year.

In a study that was published recently, researcher Jonathan Bourne at University College London studied the relationship between the amount of properties which do not have permanent residents, and housing affordability in different parts of England and Wales. Upon researching the data, which represents about 40% of the population, the researcher was stunned to find that there were over 340,000 empty apartments across the places.

Though some cities are trying to meet housing demands by building more housing, Bourne suggests that local governments put an empty homes tax of 1% instead. “The data shows that empty homes are very concentrated in small numbers of desirable areas. In such cases simply building more homes is not going to solve the problem, as the issue is severe competition for property, not a lack of places to live. ” says Bourne.

Vancouver introduced a similar empty homes tax in 2017, which was the first of   its kind in North America. One year after it went into effect, the city reported a 15% decrease in unoccupied homes, which amounted to 163 properties being rented out to local people. Furthermore, the tax raised more than $ 38 million in city revenue(税收),all of which was spent on affordable housing programs.

1. Who might be blamed for low housing affordability?
A.Local residents.B.Foreign tourists.
C.The local governments.D.The owners of empty homes.
2. What does the example of Vancouver imply?
A.Taxing empty properties works well.
B.Taxes on housing need to be cut down.
C.Providing more housing is a wise choice.
D.Housing demands have fallen in North America.
3. What is the purpose of this text?
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B.To suggest building more new homes.
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D.To discuss solutions to affordable housing.
2021-04-12更新 | 91次组卷
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【推荐2】Trees take carbon dioxide from the atmosphere and store it in complex molecules (分子), releasing oxygen. The more photosynthesis (光合作用), the more carbon is locked away.

Carbon dioxide is a major driver of climate change, so the more that can be taken out of the atmosphere by plants, the better. With the warmer climate leading to a longer growing season, some researchers have suggested that more carbon dioxide would be absorbed by trees and other plants than in previous times. But a new study has changed this theory and could have profound effects on how we adapt to climate change.

The researchers at the Swiss Federal Institute of Technology studied the degree to which the timing of colour changes in autumn tree leaves was determined by the growth of the plants in the previous spring and summer.

Using data from the Pan European Phenology Project, which has tracked some trees for as long as 65 years, the researchers found in their long-term observational study that as the rate of photosynthesis increased, leaves changed colour and fell earlier in the year. For every 10%d increase in photosynthetic activity over the spring and summer growing season, trees shed their leaves, on average, eight days earlier.

This research shows that deciduous (每年落叶的) trees can only absorb a set amount of carbon each year and once that limit is reached, no more can be absorbed. At that point, leaves begin to change colour. This limit is set by the availability of nutrients, particularly nitrogen (氮气), and the physical structure of the plant itself, particularly the inner vessels which move water and dissolved nutrients around. Nitrogen is a key nutrient which plants need in order to grow, and it’s often the amount of available nitrogen that limits total growth. This is why farmers and gardeners use nitrogen fertilisers (肥料) to overcome this limitation.

It suggests that by 2100, when tree growing seasons are expected to be between 22 and 34 days longer, leaves will fall from trees between three and six days earlier than they do now.

1. What can we know from the first two paragraphs?
A.More carbon dioxide has been absorbed by plants than before.
B.Higher temperature has an influence on plants’ growing season.
C.Climate change can be solved naturally through photosynthesis.
D.Plants can give off oxygen and molecules through photosynthesis.
2. How many days earlier may leaves averagely fall with 20% increase in photosynthesis?
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4. What does the author mainly intend to inform us?
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B.Warmer climate contributes to longer growing season.
C.Farmers use fertilizers to increase the growth of plants.
D.The amount of carbon plants absorb is limited in a year.
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【推荐3】A short period of sleep taken during the day is known as a nap. Naps don’t just have benefits for adults at work, though. They could also help pupils to make the most of their school day. Studies have shown that a 20 to 30-minute “beauty sleep” makes people more alert and focused. This improves people’s ability to remember new information, which would help school children concentrate during lessons. Experts say that napping also improves brain functions, such as memory and the ability to complete difficult tasks.

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There are long-term benefits to taking a short nap, too. According to a recent study from University College London, the brains of people who have regular naps are bigger than those who don’t. People’s brains naturally shrink when they grow old, and the results showed that little sleeps can help people’s brains to age more slowly.

Although a nap can seem like a good idea, going to sleep for too long can actually make you feel worse. It’s not very pleasant to wake up from a daytime nap feeling confused and sleepy. Napping during the day can also have a negative impact on how well you sleep at night. This can create a cycle of not being able to sleep as well at night, leaving you feeling even more tired in the daytime. Sleep expert Dr Clete Kushida said, “It’s generally recommended to maximize sleep at night.”

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