题目
题型：不详难度：来源：
Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用)．Now researchers have found a way to imitate this seemingly simple process.
The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip with catalysts (催化剂)．Similar to natural leaves，it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell，which uses those two materials to produce electricity，located either on top of a house or beside the house.
Though the leaf is only about the shape of a poker card，scientists claimed that it is promising to be an inexpensive source of electricity in developing countries. “One can imagine villages in India and Africa not long from now purchasing an affordable basic power system based on this technology,” said Nocera at a conference of the American Chemical Society.
The artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive and unstable for practical use. The new leaf，by contrast，is made of cheap materials，easy to use and highly stable. In laboratory studies，Nocera showed that an artificial leaf prototype (原型) could operate continuously for at least 45 hours without a drop in activity.
The wonderful improvements come from Nocera"s recent discovery of several powerful，new and inexpensive catalysts. These catalysts make the energy transformation inside the leaf more efficient with water and sunlight. Right now，the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides，the device can run in whatever water is available；that is，it doesn"t need pure water. This is important for some countries that don"t have access to pure water.
With the goal to “make each home its own power station” and “give energy to the poor”，scientists believe that the new technology could be widely used in developing countries，especially in India and rural China.
小题1:Which of the following orders correctly shows how the artificial leaf is used to produce electricity?
a．artificial leaves split water into hydrogen and oxygen
b．the hydrogen and oxygen gases are stored in a fuel cell
c．the artificial leaves are put in water
d．the fuel cell uses hydrogen and oxygen to produce electricity
| A．c，a，b，d | B．c，b，a，d |
| C．b，c，a，d | D．c，a，d，b |
| A．build up more power stations in the world |
| B．provide cheaper energy for developing countries |
| C．offer people in developing countries access to pure water |
| D．gain a deeper understanding of the photosynthesis process |
| A．an introduction to the history of artificial leaves |
| B．a mixture of water power and solar energy |
| C．giving energy to the poor |
| D．an invention copying photosynthesis |
答案
小题1:A
小题2:B
小题3:D
解析
试题分析：本文介绍了一项仿造叶子光合作用的发明—人工叶子的工作原理、工作性能和工作条件，可为发展中国家提供便宜的能源。
小题1:细节题：根据第三段中“it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell，which uses those two materials to produce electricity，located either on top of a house or beside the house.”当把它投入一桶水中，可以把水分解成氢和氧。然后把氢和氧气体储存到放置在房间里或房子的旁边的燃料电池中,使用这两个材料来产生电能。由此可知正确顺序是A。故选A。
小题2:细节题：根据第四段中“scientists claimed that it is promising to be an inexpensive source of electricity in developing countries.”科学家声称,它可为发展中国家提供廉价的电力来源。故选B。
小题3:主旨题：阅读全文可知本文介绍了一项仿造叶子光合作用的发明—人工叶子的工作原理、工作性能和工作条件，可为发展中国家提供便宜的能源。故选D。
核心考点
试题【What will power your house in the future？Nuclear，wind，or solar power？According t】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
A study found that people decide where they stand based on a micro social status，established within seconds of entering the lift.
Rebekah Rousi．a Ph. D．student in cognitive(认知)science，conducted an ethnographic(人种论)
Study of elevator behaviour in two of the tallest office buildings in Adelaide，Australia.As part of her research，she took a total of 30 lift rides in the two buildings，and discovered .There was an established order to where people tended to stand
In a blog she writes that more senior men seemed to direct themselves towards the back of the elevator She said：“In front of them were younger men，and in front of them were women of aII ages.”She also notice there
was a difference in where people directed their gaze(注视)half way through the ride．“Men watched the monitors，looked in the side mirrors(in one building)to see themseIves．And in the door mirrors(of the other building)to also watch others Women would watch the monitors and avoid eye contact with other users(unless in conversation)and the mirrors，”she writes．
She concluded it could be that people who are shyer stand toward the front，where they can’t see other passengers，whereas confident people stand in the back，where they have a view of everyone else.
小题1:The passage is mainly about
A. elevator riding manners
B communication in the elevator
C. elevator riders’ standing positions
D. micro social status in the elevator
小题2:The underlined word“it”in the first paragraph probably refers to“ ”
| A．an elevator | B．the new research | C．eye contact | D．social status |
A confident B shy C honest
小题4:The conclusion of the research in the passage is
A. subjective B．objective C critical D doubtful
I found the description in the 2003 book When Smoke Ran like Water，by epidemiologist(流行病学家)and environmental advocator(倡导者)Devra Davis．In it,Davis looks back at several historic pollution events and their disastrous effect on human human health-and at how these phenomena were often Ignored or even actively covered up by then people in charge at that time.
As Davis points out，John Evelyn was ahead of his time when writing about how London’s polluted air affected the well-being of its residents．It wasn’t until nearly 300 years later,after what became well-known as the Great Smog of 1952，that the government began to address the problem in a systematic way．
For four days．Between December 5th“and 9th“，due to all accident of the weather pattern，the city was buried in a heavy fog .People were still burning coal for fuel，and low-grade coal at that time， because 0f wartime condition．A temperature inversion(转向)trapped the smoke from the city’s fires， creating a black cloud in which people could barely find their way down the most familiar streets
Some tried to protect themselves，but most people simply went about their business. But l952’s fog was far worse than any other in memory．In the same week of the previous year, 1852 people had died in London；inl952，that number was 4703 And the deaths didn’t stop when the weather changed and the fog lifted．Davis and her colleagues analyzed data from the next several months and found that about 13000 more people died between December and March than one would have predicted from historical averages Many of them died of pneumonia(肺炎)．The government，she writes．Tried to blame a bad flu season．Her detailed analysis found that explanation simply did
not pan out．
Davis writes that even today in this country ,we still have not completely absorbed the lessons of similar events．Sixty years the killer fog lifted in London，people are dying preventable deaths and suffering life．changing illnesses，simply because they must breathe the air of the cities where they live
小题1:The passage is written to
| A．warn people of the danger from air pollution |
| B．introduce London’s Great Smog of l952 |
| C．blame the government for the smog |
| D．explain the reasons for air pollution |
| A．imaginary | B．adventurous | C．unbelievable | D．annoying |
| A．people burned wood for fuel |
| B．a forest fire created a black cloud over the city |
| C．the government ignored the smog |
| D．most people went abouttheirbusine00 |
A. lndifferent B Concerned C．Hopeless．D. Panic
·The best way to start growing strawberries is to buy pot-grown strawberry plants m spring：5plants are plenty for a hanging basket and 10 for the average 13 inch-sized pot．
·Plant them immediately in soil-based compost(混合肥料) and they will produce a modest crop in their first year．The second year should see a bumper(特大的)crop，followed by a slightly lower yield(产量)the third summer .Then start again with fresh stock
·Careful watering and feeding are essential Ifyou are to harvest a good crop，you must never
let the compost dry out,particularly when the fruit is forming and ripening；if you do．most of your
crop will drop off血e bush almost immediately．
·Water well then leave the pots for up to 3 weeks，until they reach the point of drying out Be
Careful not to overwater them during the winter months．
Pruning apple trees
·A one-year-old tree is known as a “maiden”. It has a single stem when purchased. Immediately after planting, cut it back by about half to leave 4 good buds at the base of the stem.. This will force growth from the base or the plant during the summer.
·In the second year ,prune in winter by cutting all side branches back by about one-third, Make sure each cut is made cleanly just above an outward-facing bud. In the third and fourth years, new side branches will have emerged from the previous year’s growth. Cut back all these new side branches by a third, pruning to an outward-facing bud.
·By the fifth year the tree should have a well-balanced shape. From then on ,cut back all new branches by one-third in winter .Remove any diseased wood and broken branches, and ensure the centre is open to air circulation
小题1:The two pieces of advice probably appear in
| A．a scientific repot | B．a gardening guide | C．a book review | D．a fashion column |
| A．the size of a pot | B．the season of harvesting |
| C．the number of plants in a pot | D．careful watering and feeding |
| A．remove the diseased and broken branches |
| B．keep the whole tree open to air circulation |
| C．force the apple tree to grow from the base in winter |
| D．help the apple tree to form a well-balanced shape |
| A．season | B．water | C．compost | D．cutting |
Teachers love school uniforms because it helps provide an orderly learning environment. Having students dressed in uniforms may teach them how to present themselves in a neat and professional manner. It gives students the opportunity to learn how to dress like young ladies and gentleman. And they can focus their attention on academics rather than style.
Purchasing (购买) school uniforms is easy and needs less hesitation and consideration. No matter what the school’s policy is, there are only specific essential (基本的) pieces to the wardrobe (服装) that are necessary, so it won’t break the bank. A few wardrobe items can last a long time. Parents could also enjoy an easy morning, as it will take less time to choose a set of clothes for the school day.
Students wearing uniforms will feel less pressure about what to wear or not to wear when their classmates are dressed similarly. Getting dressed before school becomes less of a chore(琐事) when students are limited in their choices, so there shouldn’t be any trouble about choosing an outfit for the day and getting ready quickly. Some students may not like the lack of individuality(个性) with a uniform, but some school dress code policies may offer them the opportunities to show their unique styles.
Uniforms today are also becoming trendier and can be seen in many areas of pop culture. Celebrities(名人)and fashion designers are using uniforms as inspiration for new looks which also appeal to students.
小题1:What would be the best title for the text?
| A．How to dress properly. |
| B．The history of school uniforms. |
| C．The advantages of school uniforms. |
| D．How to deal with pressure in school. |
| A．is just a tradition that students should follow |
| B．makes students feel less pressure in study |
| C．helps students put more effort into their studies |
| D．makes students lose their independence and identity |
| A．a school uniform doesn’t cost a lot of money |
| B．a school uniform should be worn every day |
| C．parents will have to go to the bank many times |
| D．parents who work in a bank can afford the uniform |
| A．are not popular with fashion designers |
| B．were not accepted by parents in the past |
| C．will be designed by students themselves |
| D．will be more fashionable in the future |
| A．negative | B．supportive | C．doubtful | D．unclear |
The scientists argue that failure to control greenhouse gas emissions will have a greater effect on marine ecosystems than previously thought. Previous research has suggested that changing ocean temperatures would affect both the distribution and the reproductive abilities of many species of fish. This new work suggests that fish size would also be heavily affected.
The researchers built a model to see how fish would react to lower levels of oxygen in the water. As ocean temperatures increase, so do the body temperatures of fish. But, according to lead author, Dr William Cheung, from the University of British Columbia, the lower level of oxygen in the water is key. Warmer waters could decrease ocean oxygen levels and greatly reduce fish body weight. On the other hand, rising temperatures directly increase the metabolic rate of the fish"s body function. This leads to an increase in oxygen demand for normal body activities. So the fish will run out of oxygen for growth at a smaller body size.
The research team also used its model to predict fish movements as a result of warming waters. The group believes that most fish populations will move towards the Earth"s poles at a rate of up to 35km per decade. "So in, say, the North Sea," says Dr Cheung," one would expect to see more smaller-body fish from tropical waters in the future."
Taking these factors into consideration, the research team concludes that fish body size will shrink between 14% and 24%, with the largest decreases in the Indian and Atlantic oceans.
When compared with actual observations of fish sizes, the model seems to underestimate what"s actually happening in the seas. The researchers looked at two case studies involving North Atlantic cod and haddock. They found that recorded data on these fish showed greater decreases in body size than the models had predicted.
Dr Alan Baudron, from the University of Aberdeen, UK, believes smaller-sized fish could seriously affect the ability of fish to reproduce. "Smaller fish produce fewer and smaller eggs which could affect the reproductive potential of fish stocks," he said.
小题1:What"s the main idea of the passage?
| A．Global warming makes fish smaller. |
| B．Global warming makes fish decrease in numbers. |
| C．Global warming affects the fish distribution. |
| D．Global warming affects the ability of fish to reproduce. |
| A．The rising body temperatures. |
| B．The lower level of oxygen in the water. |
| C．The increasing metabolic rate. |
| D．The normal body activities. |
| A．more big fish will be born in the sea |
| B．fish tend to swim towards the shore |
| C．fish tend to move towards the warm areas |
| D．fish tend to move towards the colder areas |
| A．make an exact prediction of | B．make too low an estimate of |
| C．make too high an estimate of | D．make a careful study of |
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