It is difficult for doctors to help a person with a damaged brain. Without enough blood, the brain lives for only three to five minutes. More often the doctors can't fix the damage. Sometimes they are afraid to try something to help because it is dangerous to work on the brain. The doctors might make the person worse if he operates on the brain.
Dr. Robert White, a famous professor and doctor, thinks he knows a way to help. He thinks doctors should make the brain very cold. If it is very cold, the brain can live without blood for 30 minutes. This gives the doctor a longer time to do something for the brain.
Dr. White tried his idea on 13 monkeys. First he taught them to do different jobs, then he operated on them. He made the monkeys' blood go through a machine. The machine cooled the blood. Then the machine sent the blood back to the monkeys' brains. When the brain's temperature was 10°C, Dr. White stopped the blood to the brain. After 30 minutes he turned the blood back on. He warmed the blood again. After their operations the monkeys were like they had been before. They were healthy and busy. Each one could still do the jobs the doctor had taught them.
【小题1】The biggest difficulty in operating on the damaged brain is that _______.
| A．the time is too short for doctors |
| B．the patients are often too nervous |
| C．the damage is extremely hard to fix |
| D．the blood-cooling machine might break down |
| A．taking the blood out of the brain |
| B．trying the operation on monkeys first |
| C．having the blood go through a machine |
| D．lowering the brain' s temperature |
| A．can last as long as 30 minutes |
| B．can keep the brain' s blood warm |
| C．can keep the patient' s brain healthy |
| D．can help monkeys do different jobs |
| A．a,b,c,d | B．c,a,b,d | C．c, b, d, a | D．b, c, d, a |
【小题1】A
【小题2】D
【小题3】A
【小题4】B
解析试题分析：文章大意：大脑手术对医生来说很难，因为没有了供血，大脑只能存活三到五分钟。Dr. Robert White通过在猴子身上的实验，给医生提供了一个好办法。冷却大脑，这样大脑在没有供血的情况下就能存活半个小时，医生就能有更多的时间手术了。
【小题1】A 细节理解题。根据第一段Without enough blood, the brain lives for only three to five minutes. More often the doctors can't fix the damage.可知答案选A。
【小题2】D 细节理解题。 根据文章第二段… make the brain very cold…the brain can live without blood for 30 minutes. This gives the doctor a longer time to do something for the brain.可知，主要通过冷却大脑的方式医生进行大脑手术。答案选D。
【小题3】A 细节理解题。根据第三段…the brain can live without blood for 30 minutes.很容易得出答案选A。
【小题4】B 细节理解题。根据最后一段The machine cooled the blood. Then the machine sent the blood back to the monkeys' brains. When the brain's temperature was 10°C, Dr. White stopped the blood to the brain. … After their operations the monkeys were like they had been before.可以正确排序，手术的步骤为B。
考点：考查科学研究类阅读
口算题天天练系列答案科目：高中英语 来源： 题型：阅读理解
Researchers have developed new software using smart phones’GPS and imaging abilities that determine the exact location of distant objects as well as monitor the speed and direction of moving objects．The software could eventually allow smart phone-armed soldiers to target the location of their enemies．On the home front，the software could be used by everyone，including golfers judging distance to the green and biologists documenting the location of a rare animal without disturbing it．
“The great advantage of a Smartphone is that it provides so many tools in a single，readily available，relatively inexpensive package，”said Qia Wang，a doctoral student who led the development of the software．“For example，on the battlefield，a soldier needs a rangefinder，compass，GPS and other tools to get information before calling in an air strike．With our software，the soldier can have all those instruments in one device that can be purchased off the shelf．When that soldier returns from War，she can use the same Software to protect her family by clocking a speeder near her children’s school and catching the criminal on video．”
Wang and his colleagues developed their software to locate and track：
Targets of known size—when the size of the target is known．a single image is enough to pinpoint the target’s location．
Targets of unknown size—If the exact size of a target is unknown，the software uses two images to triangulate the location of the target·
Moving targets—By taking a short video of a moving target，the smartphone software can calculate how fast the target is moving and in what direction it is going.
“Currently，our software is limited by the physical abilities of smartphone hardware，but the devices are improving rapidly，”Wang said．“We expect that improvements in GPS accuracy，battery life and camera resolution will allow our software to make even more accurate observations．”
【小题1】From Paragraph 1 we can know that the new software can.
| A．determine the speed of moving objects |
| B．1ocate objects in the distance exactly |
| C．defend soldiers against their enemies |
| D．help biologists protect rare animal |
| A．make an advertisement |
| B．describe the software briefly |
| C．show the benefits of the software |
| D．present the functions of smartphones |
| A．By taking a short video． |
| B．By locating its position. |
| C．By taking a single image． |
| D．By measuring real-life size. |
| A．Casual． | B．Optimistic． | C．Cautious． | D．Flexible |
| A．Qia Wang，a Talented Doctoral Student |
| B．Use Smartphones to Their Full Potential |
| C．Targeting and Tracking With Smartphones |
| D．Smartphone-armed Soldiers on the Battlefield |
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科目：高中英语 来源： 题型：阅读理解
Some weightloss camps, which are rare in China just a few years ago，have multiplied in Beijing, Qingdao, Shenzhen，and other cities. Today about 15 percent of adults, or 200 million Chinese, are reportedly overweight.Of these, 90 million—about 7 percent—are obese(极肥胖的)．
Experts say the obesity epidemic(流行病) is spreading to children, though more slowly than in adults. The obesity, they say, will do harm to the health of China’ s citizens and economy.“We're seeing a very large number of teenagers who are quite heavy and aren't moving much，” said Barry Popkin, a nutrition(营养) professor. Popkin carries out an ongoing healthandnutrition survey of 16,000 households in China. He says more kids today are overeating and putting on weight “quite quickly.” In just ten years China‘s childhood obesity rate has doubled，with the greatest gains coming in urban areas.“In big cities it's a big problem.”
Some experts blame the extra fat on a range of factors, many of them tied to China’ s rapidly changing economy and culture. The diets of Chinese adults and children are far higher in meats, fish, eggs, dairy products, fats and sugars than ever before. In addition，kids—especially city dwellers—are more sedentary today and spend more time indoors in front of homework, television，computer games, and the Internet.
Shuwen Ng，a health economist, says that kids in China now have pocket money, and they spend a portion of it on junk food. Ng adds that advertising and peer groups influence kids' food choices. Certain foods, such as new candies or fast food, have attractive features.
China’ s childhood obesity rate stillfall behind that of the United States, where some 15 percent of kids are said to be obese. But the longterm effects are equally serious.
【小题1】According to the passage we know________.
| A．weightloss camps have been very popular in China six years ago |
| B．about 290 million Chinese are overweight in China in all |
| C．in China childhood obesity rate in rural areas is lower than that in major cities |
| D．America’ s childhood obesity rate is lower than China’s |
| A．Advertising on some new candies. |
| B．ignorance of weight-control. |
| C．Playing computer games for long time. |
| D．Having pocket money. |
| A．confident | B．patient | C．energetic | D．inactive |
| A．obesity explosion in China will affect the United States |
| B．there are great difference in kids' food choices now |
| C．junk food leads to childhood obesity |
| D．city children eat more than rural children |
| A．Chinese Childhood Obesity problem |
| B．Weightloss Camps in China |
| C．Obesity problem's influence on Chinese Economy |
| D．Obesity problem in China and America |
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科目：高中英语 来源： 题型：阅读理解
A board game is a game played on a pre-marked surface or “board” according to a set of rules. Board games have been played in most cultures and societies throughout history. Do you think of yourself as a bit of an expert at board games like chess or Go?
Maybe you’re not quite as good as you think. New research from the University of Manchester and Oxford suggests complex games like these are impossible to learn fully. They may even be too complex for the human mind to understand.
Researchers studied two-player games, to try and understand the strategies which people use to make decisions during the game. Some games with two players are simple, with only a small number of possible moves. Players can quickly work out the best strategy but that means the game soon becomes boring.
It gets more interesting when there are many possible moves. That’s why people are so fascinated by complex board games like chess or Go, or some card games. But what the researchers found was that with difficult games, players find it hard to work out the best strategy and their actions become less reasonable.
This research is part of the field called game theory: the study of human strategic decision-making. Much thinking on how people play complex games is based on something called “the balance point”, which is when players have a perfect knowledge of what they are going to do and of what their rivals are going to do.
When you add more than two players then of course the game becomes even harder to understand. Trading on the stock market is an example of a complex multi-player game.
【小题1】Which of the following games belongs to board games?
| A．football | B．badminton | C．swimming | D．Mahjong |
| A．the simpler the board game is, the better it is |
| B．people dislike board games for the complex moves |
| C．players are easy to lose patience when in difficult games |
| D．it’s possible for people to understand complex games thoroughly |
| A．ask other players to work out the best strategy |
| B．have a good knowledge of the games they are playing |
| C．figure out the next actions of themselves and their opponents |
| D．come to a quick decision about what to do next by themselves |
| A．Culture | B．Discovery | C．Career | D．Campus |
| A．a new research about board games |
| B．the importance of playing board games |
| C．how the players win board games |
| D．how to learn board games fully |
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科目：高中英语 来源： 题型：阅读理解
“Enough” with the multivitamins already. That’s the message from experts behind three new studies that tackled an often debated question: Do daily multivitamins多种维生素make you healthier?
“We believe that the case is closed - supplementing(补充) the diet of well-nourished adults with (most) mineral or vitamin supplements has no clear benefit and might even be harmful,” concluded the authors of the editorial summarizing the new research papers. They urge consumers to not ‘waste’ their money on multivitamins. “The ‘stop wasting your money’ means that perhaps you’re spending money on things that won’t protect you long term,” editorial co-author, Dr. Edgar Miller said, “What will protect you is if you spend the money on fruits, vegetables, nuts, beans, low fat dairy, and things like that. Exercising would probably be a better use of the money.”
The strong message was based on a review of the findings from three studies that tracked multivitamins link to cancer protection, heart health, and brain and cognitive(认知的) measures. The first study looked at vitamin supplementation’s role in preventing chronic(慢性的) disease. The next study looked at whether long-term use of multivitamins would have any effect on slowing cognitive decline. The third study looked specifically at multivitamins and minerals role in preventing heart attack. “The three studies found no difference in rates of chronic disease, heart attack and the need for hospitalization between vitamin-takers and placebo(安慰剂)-takers.” Dr. Edgar Miller stated.
One expert agreed some nutrient-deficient people may still benefit from multivitamins. “There might be an argument to continue taking a multi(vitamin) to replace or supplement your not healthy diet,” Dr. Edgar Miller added. He also notes that vitamins can benefit people with celiac disease and those who are pregnant.
【小题1】This text is likely to be selected from a book of .
| A．medicine | B．education | C．food | D．business |
| A．Vitamins should not be used for chronic disease prevention. Enough is enough. |
| B．Having a balanced diet and exercising would probably be a better way to keep healthy. |
| C．The three studies do not provide support for use of multivitamin supplements. |
| D．Taking vitamins to replace or supplement your healthy diet is necessary. |
| A．Vitamin supplements have proved harmful to the health of adults. |
| B．Vitamin supplements are beneficial in certain conditions. |
| C．Nowadays taking vitamin supplements is common to most people. |
| D．Daily multivitamins will make you healthier. |
| A．persuade | B．describe | C．inform | D．instruct |
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科目：高中英语 来源： 题型：阅读理解
Coffee is a powerful beverage．On a personal level，it helps keep US awake and active．On a much broader level，it has helped shape our history and continues to shape our culture．
Coffee didn’t take off until the l400s when people figured out they could roast its seeds．By the l500s，the drink had spread to coffeehouses across the Arab world．Within another l50 years，it took Europe by storm．
“It actually had a major impact on the rise of business，” historian Mark Pendergrast says．Coffeehouses became a spot not just to enjoy a cup but to exchange ideas．The insurer Lloyd’s of London was founded hundreds of years ago in one of London’s 2,000 coffeehouses．Literature，newspapers and even the works of great composers like Bach and Beethoven were also spawned(涌现)in coffeehouses．
It is often said that after the Boston Tea Party of l773，when American colonists attacked British tea ships and threw boxes of tea into the harbor，Americans universally switched over to drinking coffee．In a letter John Adams wrote to his wife，Abigail，the Founding Father claims his love of tea but says he will have to learn to embrace coffee instead，because drinking tea had become a symbol of not loving the country．
For all the upsides coffee has brought the modern world，it also led to its fair share of downsides，too．Europeans carried coffee with them as they colonized various parts of the world，and this frequently meant they enslaved people in order to grow it．In Brazil — where slavery was legal until l888 — coffee plantations would use slash-and-burn agriculture，tearing down rain forests and planting coffee trees．Once the soil had been exhausted，growers would move on to another place．
And yet，coffee，as Pendergrast says，”had a very good impact in many ways on our civilization，even though it was，for a long time，grown by slaves．”
【小题1】Why did people enjoy going to coffeehouses?
| A．Because it was a fashion to drink coffee． |
| B．Because coffeehouses provided a better flavor． |
| C．Because they could stay awake and active there． |
| D．Because they could exchange ideas there． |
| A．American colonists made great profits by trading in coffee． |
| B．Tea was regarded as a symbol of loving one’s country． |
| C．Coffee became very popular after the incident in Boston． |
| D．John Adams was the Founding Father of the Tea Party． |
| A．Coffee plantation was closely connected with slavery |
| B．coffee plantation led to outdated agriculture in Brazil |
| C．slavery in Brazil had been against the law until l888 |
| D．slavery was responsible for the damage to rainforests |
| A．Some interesting stories about coffee culture． |
| B．Important Roles that coffee played in history． |
| C．How coffee became the most popular beverage． |
| D．How coffee affected America’s independence． |
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科目：高中英语 来源： 题型：阅读理解
Global warming happens when greenhouse gases trap heat and light from the sun in the earth’s atmosphere, which increases the temperature. This is like when heat is trapped in a car. On a hot day, the car gets hotter when it is out in the parking lot. This is because the heat and light from the sun can get into the car, by going through the windows，but it can’t get back out. This is what the greenhouse effect does to the earth .The heat and light can get through the atmosphere, but it can’t get out As a result，the temperature rises.
Sometimes the temperature can change in a way that helps us. The greenhouse effect makes the earth appropriate for people to live on Without it，the earth would be freezing，or it would be burning hot. It would be freezing at night because we would not get the sun’s heat and light .During the day, especially during the summer, it would be burning because the sun would be up with no atmosphere to filter(过滤)it，so people，plants，and animals would be exposed to all the light and heat.
Although the greenhouse effect makes the earth able to have people living on it，if there gets to be too many gases，the each can get unusually warmer, and many plants，animals．and people will die. Plants would die because they would not be able to take the heat .This would cause us to have less food to eat, and it would also limit the food that animals have. With less food for the animals that we need to survive we would even have less food. Gradually, people，plants，and animals would all die of hunger．
People are doing many things to try to stop global warming .One thing is carpooling—driving with someone to a place that you are both going to. Another thing is being more careful about leaving electrical devices turned on. Now, more people are even riding buses or bikes to lower the amount of greenhouse gases in the air .Although adults do many things to help stop global warming, kids call do just as much.
【小题1】By the example given in Paragraph l, the author wants to__________.
| A．explain how global warming happens |
| B．show his feeling in a car in hot summer |
| C．tell us cars are causes of greenhouse gases |
| D．say that I there are greenhouse gases in every car |
| A．light | B．greenhouse effect | C．temperature | D．heat |
| A．IT only traps the heat of the sun. |
| B．It does great harm to humans. |
| C．It makes the earth neither to hot nor too cold. |
| D．It prevents all the light from the sun shining on the earth. |
| A．lf there is greenhouse effect．all the plants will die |
| B．Human beings are likely to disappear from the earth |
| C．Crops can ′t take in the heat lf there is greenhouse effect |
| D．Although greenhouse effect is necessary．Too much of it will cause us to die. |
| A．What kids can do to help stop global warming. |
| B．Who should be responsible for the environmental problems. |
| C．What global warming is doing to the environment. |
| D．Why cars and buses pollute the air a lot |
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科目：高中英语 来源： 题型：阅读理解
Electric cars are dirty.In fact，not only are they dirty，they might even be more dirty than their gasolinepowered cousins.
People in California love to talk about “zeroemissions vehicles”，but_people_in_California_seem_to_be_clueless_about_where_electricity_comes_from.Power plants mostly use fire to make it.Aside from the new folks who have their roofs covered with solar cells，we get our electricity from generators.Generators are fueled by something—usually coal，oil，but also by heat generated in nuclear power plants.There are a few wind farms and geothermal(地热的) plants as well，but by far we get electricity mainly by burning something.
In other words，those “zeroemissions” cars are likely coalburning cars.It’s just because the coal is burned somewhere else that it looks clean.It is not.It’s as if the California Greens are covering their eyes—“If I can’t see it，it’s not happening.” Gasoline is an incredibly efficient way to power a vehicle；a gallon of gas has a lot of energy in it.But when you take that gas(or another fuel) and first use it to make electricity，you waste a nice part of that energy，mostly in the form of wasted heat—at the generator，through the transmission(传送) lines，etc.
A gallon of gas may propel your car 25 miles.But the electricity you get from that gallon of gas won’t get you nearly as far—so electric cars burn more fuel than gaspowered ones.If our electricity came mostly from nukes；or geothermal，or hydro，or solar，or wind，then an electric car truly would be clean.But for political，technical，and economic reasons，we don’t use much of those energy sources.
In addition，electric cars’ batteries which are poisonous for a long time will eventually end up in a landfill.And finally，when cars are the polluters，the pollution is spread across all the roads.When it’s a power plant，though，all the junk is in one place.Nature is very good at cleaning up when things are too concentrated，but it takes a lot longer when all the garbage is in one spot.
【小题1】What does the underlined part mean in Paragraph 2?
| A．People see the California Greens everywhere. |
| B．People in California love to talk about zeroemissions vehicles. |
| C．People in California love to have their roofs covered with solar cells. |
| D．People in California have no idea that so far electricity mainly comes from burning coal，oil，etc. |
| A．Electric cars are not clean at all. |
| B．Electric cars are better than gasolinepowered ones. |
| C．People cast doubts on electric cars’ batteries. |
| D．Gasoline is an efficient way to power a vehicle. |
| A．not less than 25 miles |
| B．as far as 50 miles |
| C．as far as 25 miles |
| D．not more than 25 miles |
| A．being green is good and should be encouraged in communication |
| B．electric cars are not clean in that we get electricity mainly by burning something |
| C．zeroemissions vehicles should be chosen to protect our environment |
| D．electric cars are now the dominant vehicle compared with gasolinepowered cousins |
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科目：高中英语 来源： 题型：阅读理解
Most people know precious gemstones (宝石) by their appearances. An emerald flashes deep green, a ruby seems to hold a red fire inside, and a diamond shines like a star. It’s more difficult to tell where the gem was mined, since a diamond from Australia or Arkansas may appear the same to one from the Democratic Republic of the Congo. However, recently, a team of scientists has found a way to identify a gemstone’s origin.
Beneath the surface of a gemstone, on the tiny level of atoms and molecules（分子）, lie clues (线索) to its origin. At this year’s meeting of the Geological Society of America in Minneapolis, Catherine McManus reported on a technique that uses lasers (激光) to clarify these clues and identify a stone’s homeland. McManus directs scientific research at Materialytics, in Killeen, Texas. The company is developing the technique. “With enough data, we could identify which country, which mining place, even the individual mine a gemstone comes from,” McManus told Science News.
Some gemstones, including many diamonds, come from war-torn countries. Sales of those “blood minerals” may encourage violent civil wars where innocent people are injured or killed. In an effort to reduce the trade in blood minerals, the U.S. government passed law in July 2010 that requires companies that sell gemstones to determine the origins of their stones.
To figure out where gemstones come from, McManus and her team focus a powerful laser on a small sample of the gemstone. The technique is called laser-induced breakdown spectroscopy. Just as heat can turn ice into water or water into steam, energy from the laser changes the state of matter of the stone. The laser changes a miniscule part of the gemstone into plasma, a gas state of matter in which tiny particles（微粒）called electrons separate from atoms.
The plasma, which is superhot, produces a light pattern. (The science of analyzing this kind of light pattern is called spectroscopy.) Different elements（元素）produce different patterns, but McManus and her team say that gemstones from the same area produce similar patterns. Materialytics has already collected patterns from thousands of gemstones, including more than 200 from diamonds. They can compare the light pattern from an unknown gemstone to patterns they do know and look for a match. The light pattern acts like a signature, telling the researchers the origin of the gemstone.
In a small test, the laser technique correctly identified the origins of 95 out of every 100 diamonds. For gemstones like emeralds and rubies, the technique proved successful for 98 out of every 100 stones. The scientists need to collect and analyze more samples, including those from war-torn countries, before the tool is ready for commercial use.
Scientists like Barbara Dutrow, a mineralogist from Louisiana State University in Baton Rouge, find the technique exciting. “This is a basic new tool that could provide a better fingerprint of a material from a particular locality,” she told Science News.
【小题1】We learn from Paragraph 1 that __________________.
| A．an emerald and a ruby are names of diamonds. |
| B．it’s not difficult to tell where the gem was mined. |
| C．appearances help to identify the origin of gemstones. |
| D．diamonds from different places may appear the same. |
| A．To look for more gemstones. |
| B．To encourage violent civil wars. |
| C．To reduce the trade in blood minerals. |
| D．To develop the economy. |
| A．Heat can turn ice into water or water into steam. |
| B．Gemstones from the same area produce similar light patterns. |
| C．Laser can changes a miniscule part of the gemstone into plasma. |
| D．Materialytics has already collected patterns from thousands of gemstones. |
| A．It is ready for commercial use. |
| B．People can use the new tool to find more gemstones. |
| C．It can significantly reduce the gemstones trade in blood minerals. |
| D．It will bring about a revolutionary change in identifying the origin of minerals. |
| A．tell us how to identify the origin of diamonds. |
| B．introduce a laser technique in identifying a stone’s origin |
| C．prove identifying the origin of gemstones are difficult |
| D．attract our attention to reducing trade in blood minerals |
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