The world’s elderly population will exceed(超过...

The world’s elderly population will exceed(超过) ____ of children by 2060,when each group ____ to account for about one fifth of the population.

A．that; expects                           B．those ; will expect

C．that ; is expected                       D．one ; will be expected

高三英语单项填空中等难度题查看答案及解析

The world’s elderly population will exceed(超过) ____ of children by 2060, when each group ____ to account for about one fifth of the population.

A．that ; is expected                       B．it; will expect

C．that; expects                           D．one ; will be expected

高三英语单项填空简单题查看答案及解析

The speed of 6G will exceed 125 GB/s, ______ a new generation of virtual reality.

A.allowing for B.accounting for C.calling for D.compensating for

高三英语单项填空困难题查看答案及解析

Attracting ________senior citizens, Florida is________home to the largest population of elder Americans．

A．/; /                    B．the; the        C．the; /                  D．/ ; a

高三英语单项填空中等难度题查看答案及解析

As the world’s population grows, farmers will need to produce more and more food. And large farms are increasingly using precision farming to increase yields (产量), reduce waste, and reduce the economic and security risks that inevitably accompany agricultural uncertainty.

Traditional farming relies on managing entire fields—making decisions related to planting, harvesting, irrigating, and applying pesticides and fertilizer (农药和化肥)—based on regional conditions and historical data. Precision farming, by contrast, combines sensors, robots, GPS, mapping tools and data-analytics software to customize（量身定制）the care that plants receive without increasing labor. Robot-mounted sensors and camera-equipped drones (无人机) wirelessly send images and data on individual plants to a computer, which looks for signs of health and stress. Farmers receive the feedback in real time and then deliver water, pesticide or fertilizer in adjusted doses（剂量）to only the areas that need it. The technology can also help farmers decide when to plant and harvest crops.

As a result, precision farming can improve time management, reduce water and chemical use, and produce healthier crops and higher yields—all of which benefit farmers’ bottom lines and conserve resources while reducing chemical runoff.

Many small businesses are developing new software, sensors, and other tools for precision farming, as are large companies such as Monsanto, John Deere, Bayer, Dow and DuPont. The U.S. Department of Agriculture, NASA and the National Oceanic and Atmospheric Administration all support precision farming, and many colleges now offer course work on the topic.

In a related development, seed producers are applying technology to improve plant characteristics. By following individual plants over time and analyzing which ones flourish in different conditions, companies can relate the plants’ response to their environments with their genomics (基因组学). That information, in turn, allows the companies to produce seed varieties that will grow well in specific soil and weather conditions. This advanced technology may also help to improve crop nutrition.

Farmers do not universally welcome precision agriculture for various reasons, such as high equipment costs and lack of access to the Internet. The technology may bring great challenges to experienced farmers who are not good at computers. And large systems will also be beyond the reach of many small farming operations in developing nations. But less expensive, simpler systems could potentially be applied. For others, though, cost savings in the long run may reduce the financial concerns. And however reticent some farmers may be to adopt new technology, the next generation of farmers are likely to warm to the approach.

1.Precision farming differs from traditional farming partly because it ________.

A. guarantees high yields with more labor

B. relies on regional conditions and historical data

C. offers plenty of water, pesticides and fertilizer

D. provides real time information about target crops

2.About precision farming, we can learn that________.

A. the government holds a cautious attitude

B. it draws positive responses from businesses

C. seed producers have already made huge profits

D. large systems will soon be built in developing nations

3.The underlined word “reticent” in the last paragraph probably means ________.

A. disappointed　　 B. confused

C. unwilling　　 D. shocked

4.What is the best title for the passage?

A. Precision Farming Increases Crop Yields

B. More Challenges Faced by Modern Farmers

C. Development of Farming Systems in the U.S.

D. Traditional Farming is Gradually Disappearing

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.

高三英语单项填空简单题查看答案及解析

Maps of the world’s population show that the majority of people today live near water. 1.We also vacation at the beach and find comfort fishing on a lake. Nothing makes small children happier than the chance of playing in water. More interesting, this human favor for water makes evolutionary sense. 2.

Neuroscientist(神经系统科学家) Michael Crawford of the University of North London has proposed that our ancient ancestors attached to the sea, and that their devotion paid off by allowing the human species to develop large and complex brains. Crawford claims that when humans separated from apes and appeared in the forests of Africa, they stuck close to rivers and beaches and started catching fish and crabs.3.

It's no coincidence, Crawford claims, that human brain growth began to increase rapidly once we left the woods and headed for the beach.

4.Psychiatrist(精神病学家)and biochemist Joseph Hibbelin of National Institutes of Health has shown that across cultures there is direct link between amount of fish eaten each week and rates of depression. More interesting, Hibbelin and researcher Laura Reis have found that fish is commonly used as a symbol of happiness and good health in various religions and cultures.

5.We vacation on the coast and see the waves come and go, feeling happiness has taken over our brain. When we move inland, or go home from vacation, we lose touch with our sea roots and feel unhappy.

A. Sure, we need drinking water to live, but we have also benefited from what’s swimming under waves.

B. We know that fish and the sea are good for us, and we seek them out.

C. We live along coastlines, around bays, up the course of rivers and streams and on islands.

D. Scientists help people overcome depression.

E. Scientists have also discovered that people who eat fish regularly are less likely to suffer from depression than those who eat less seafood.

F. It is good for our health to swim under the waves.

G. That sea food was packed with omega-3 fatty acids, essential fatty acids that promote brain cell growth.

高三英语七选五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

As the world’s population continues to grow, the ___of food becomes more and more of a concern.

A．worth            B．supply            C．package           D．list

高三英语单项填空中等难度题查看答案及解析

(2013·浙江，4)As the world's population continues to grow，the ________ of food becomes more and more of a concern.

A．worth　 B．supply　 C．package　 D．list

高三英语单项填空中等难度题查看答案及解析