Much time _____ siting at a desk, office clerks are generally troubled by various health problems.
A. being spent B. having spent
C. spending D. spent
名校课堂系列答案科目：高中英语 来源：2015-2016学年黑龙江大庆一中高二下假期验收英语卷（解析版） 题型：阅读理解
We live in a sweet world. The average American kid consumes more than 20 teaspoons of sugar per day, and adults eat 50% more sugar today than they did in the 1970s. We all know that too much sugar isn’t good for you. But did we know it could be dangerous? A team of researchers at the University of Utah used mice to conduct a study on the negative effects of sugar. They found it could have serious effects on people’s health.
Sugar is found not only in sweets and candies, but also in many household items like pasta and crackers.
During the 58-week-long study, mice were fed a diet containing 25% more sugar. This percentage equals a healthy human diet along with three cans of soda daily. The team found that these mice were twice as likely to die as mice fed a similar diet without the sugar. Though the mice did not show signs of obesity or high blood pressure, male mice were 26% less territorial and produced 25% fewer offspring than the other mice.
Scientists often use mice for research because they have a similar genetic（基因） structure to humans. “Since most substances that are dangerous in mice are also dangerous in people, it’s likely that those physical problems that cause those mice to have increased deaths also work in people,” says study author James Ruff of the University of Utah. Findings from this study reveal negative effects that are not as noticeable as weight gain or heart problems. Sugar can contribute to long-term changes in the body that can change development and even shorten lives.
Cutting sugar out of the American diet altogether may be difficult. But making the effort to control our nation’s sugar desire will provide for a truly sweeter future.
1.The study conducted by researchers aimed at learning about________
A. the advantages and disadvantages of sugar
B. the negative effects of sugar on people’s health
C. the genetic structure of mice
D. American’s diet
2.According to the study, which of the following statements is wrong?
A. Sugar can even shorten lives.
B. Sugar’s negative effects are not noticeable.
C. Mice are more likely to die when fed a diet containing 25% more sugar.
D. Eating much more sugar can make mice put on weight and get high blood pressure.
3.From the passage we can infer_______
A. sugar plays a very important role in Americans’ diet
B. kids consume more sugar than adults in America
C. the study on human beings lasted 58 weeks
D. the genetic structure of mice is totally different from that of people
4.What’s the best title of the passage?
A. Living a sweet life
B. Kids consume much more sugar
C. Genetic structure of humans
D. Danger of sugar
查看答案和解析>>
科目：高中英语 来源：2016届重庆市高三3月月考英语试卷（解析版） 题型：阅读理解
Walk through the Amazon rainforest today and you will find it steamy, warm, damp and thick. But if you had been there around 15,000 years ago, during the last ice age, would it have been the same? For more than 30 years, scientists have been arguing about how rainforests might have reacted to the cold, dry climate of the ice ages, but till now, no one has reached a satisfying answer.
Rainforests like the Amazon are important for mopping up CO2 from the atmosphere and helping to solve global warming. Currently the trees in the Amazon take in around 500 million tons of CO2 each year: equal to the total amount of CO2 given off in the UK each year. But how will the Amazon react to the future climate change? If it gets drier, will it survive and continue to draw down CO2? Scientists hope that they will be able to learn in advance how the rainforest will manage in the future by understanding how rainforests reacted to climate change in the past.
Unfortunately, collecting information is incredibly difficult. To study the past climate, scientists need to look at fossilized pollen（花粉）kept in lake mud, Going back to the last ice age means drilling down into lake sediments（沉淀物）, which requires specialized equipment and heavy machinery. There are very few roads and paths, or places to land helicopters and aeroplanes. Rivers tend to be the easiest way to enter the forest, but this still leaves vast areas between the rivers completely unsampled（未取样）. So far, only a handful of cores have been drilled that go back to the last ice age and none of them provide enough information to prove how the Amazon forest reacts to climate change.
1.How do scientists study the past climate change?
A. By predicting the climate change in the future.
B. By drilling down deep into land sediments.
C. By analyzing fossilized pollen in lake mud.
D. By taking samples from rivers in the Amazon.
2.Why is it difficult to collect information about the past climate change?
A. Because scientists can't find proper equipment and machinery.
B. Because it is very difficult to obtain complete samples.
C. Because helicopters and aeroplanes have no place to land.
D. Because none of the cores provide any information.
3.Where is the passage most probably taken from?
A. A medical journal. B. A news report
C. A travel brochure. D. A science magazine.
4.The best title for the text may be .
A. Secrets of the Rainforest
B. Climates of the Amazon
C. The History of the Rainforest
D. Changes of the Rainforest
查看答案和解析>>
科目：高中英语 来源：2016届河北武邑中学高三下学期周考3英语试卷（解析版） 题型：阅读理解
While astronauts in space get to do many exciting things, they miss out on ordinary things that we all take for granted-being able to walk on firm ground, hanging out with family and digging into a slice of hot steaming pizza. Though not much can be done about the first two things, there may soon be a solution to the third one, thanks to this cool 3-D pizza printer!
About a year ago, NASA offered $125,000 to Anjan Contractor, a 3-D technology expert, to build a device（设备）that would allow astronauts to make pizza on demand. The mechanical engineer promised that his invention would produce pies in large quantities that looked, tasted and even smelled like pizza made in common ovens.
Late last year, the engineer presented a video of his first prototype（原型）that begins by creating a single slice of dough（面团）that is cooked and printed at the same time. Then comes the tomato “sauce” —a mix of tomato powder, oil and water and finally, a protein slice that resembles cheese. While the video doesn’t show the baking process, the inventor says that once the pizza is printed, it can be ready to be consumed in 7 seconds.
While the pie in the video looks delicious enough to attract any pizza lover, Anjan Contractor is far from ready for astronauts. That’s because he still has to find a solution to make the food container in the printer last for 30 years. Though that may sound unrealistic, actually it is not.
Anjan Contractor believes that the only way that is possible is that the water is removed from all the ingredients（配料）and then they are reduced to the powder form. This, as you can imagine, will not be so easy. But, while the printer may not be ready for space, it certainly looks ready enough for people on earth. Hopefully, NASA and Contractor will consider selling it to those not fortunate enough to go to Mars!
1.Why does the author mention the things that astronauts in space cannot do?
A．To ask us not to take common things for granted.
B．To show they live a difficult life there.
C．To show their life is boring in space.
D．To introduce the topic of the text.
2.NASA offered $125,000 to Anjan Contractor mainly to __________.
A．create some new type of 3-D printer
B．attract more companies to work for NASA
C．help astronauts in space enjoy fresh pizza one day
D．produce pizza in large quantities to earn great profits
3.The biggest challenge that Anjan Contractor is faced with now is probably that __________.
A．he has no money left to go on with his research
B．the pizza doesn’t seem appetizing to pizza lovers
C．he has no way to make pizza that can last for thirty years
D．he cannot make the food container last for decades
4.What’s the best title of the passage?
A．NASA is trying its best to help astronauts eat better
B．Astronauts may soon be able to enjoy steaming hot pizza
C．NASA is working on making pizza for common people
D．A 3-D pizza printer has been used to make pizza
查看答案和解析>>
科目：高中英语 来源：2016届江苏省扬州市高三上学期期末考试英语试卷（解析版） 题型：阅读理解
Flickering lights are annoying but they may have an advantage. Visible light communication (VLC) uses rapid pluses of light to transmit information wirelessly. Now it may be ready to compete with conventional Wi-fi.
In a recent TED talk, Harald Hasas from the University of Edinburge,UK demonstrated one VLC prototype(原型），“Li-Fi", transmitting a video from a store-bought LED lamp to a solar cell to a laptop. “Li-Fi is essentially the same as Wi-Fi,except for a small difference- we use LED lights around us to transmit the data wirelessly as opposed to using radio," Haas says.
Once established, VLC could solve some major communication problems. In 2009, the US Federal Communications Commission(FCC) warned of spectrum (波谱）crisis: because our mobile devices are so data- hungry we will soon run out of radio-frequency bandwidth.Li-Fi could free up bandwidth, especially as much of the infrastructure is already in place."There are around14 billion light bulbs worldwide, they just need to replaced with LED ones that transmit data", says Haas.
The idea of transmitting data through the visible light spectrum is not new.Alexander Graham Bell transmitted sound via a beam of sunlight in 1880 using a photo phone, a sort of solar-powered wireless telephone. In the past several decades, a number of researchers have looked at using visible light to transmit data.
But what Haas seized on is the use of simple LED light bulbs for data transmission. LED bulbs are controlled by a driver, which can rapidly di the light or turn it on or off. Therefore, Haas figured, data could be encoded in subtle shifts of the light’s brightness. Eventually, he creaded a working transmitter and receiver system with an IKEA lamp and a solar panel.
Li-Fi stands to be much faster than Wi-Fi. According to Haas research, Li-Fi can achieve data density 1000 times greater than Wi-Fi,because Li-Fi signals are contained in a small area, as opposed to the more diffuse (分散的)，radio signals.The system wouldn’t mean having to keep your lights on all the time either, Haas says---bulbs could be dimmed to such a point that they appear off, but still transmit data.
Now, Haas’ team hopes that Li-Fi could make its way into homes in a few years. The system can easily network any device with an LED light—an electric kettle, an oven. Eventually, this could bring about the Internet of Things era much faster. Haas also sees Li-Fi as a way to bring internet to remote location, using hilltop transmitters and rooftop solar panels. LED streetlights could even be used to form a network of outdoor Li-Fi, making it possible to stay connected when walking around the city.
But some sound a cautious note about VLC’s future. It becomes less powerful , for example,when light is blocked, wheather due to fog or other conditions.
1.By saying "There are around14 billion light bulbs worldwide”Haas intended to tell us that ______________
A. mobile devices will consume more data
B. radio-frequency bandwidth needs to be freed up.
C. VLC might solve the spectum crisis.
D. the world has a complete lighting infrastructure.
2.The underlined phrased “seized on“ in the passage is closet in meaning to “_____________”
A distinguished B. exploited C. created D. figured
3.We can learn from the passage that ________________________
A. Li-Fi can’t work outdoors.
B Li-Fi can work with LED lights off.
C. Li-Fi can be used with all household appliances.
D. Li-Fi needs improving to next diverse need.
查看答案和解析>>
科目：高中英语 来源：2016届江苏省扬州市高三上学期期末考试英语试卷（解析版） 题型：单项填空
______ we never get entirely knocked out of the game, hope always remains.
A. Although B. So long as C. Even though D. Unless
查看答案和解析>>
科目：高中英语 来源：2016届江苏省扬州市高三上学期期末考试英语试卷（解析版） 题型：单项填空
Though Tom was physically challenged, he did not _______ himself to his fate.
A. resist B. reserve C. resign D. rescue
查看答案和解析>>
科目：高中英语 来源：2015-2016学年黑龙江友谊红兴隆管理局第一中学高一下开学考英语卷（解析版） 题型：其他题
介词填空
1.The film belongs ________ a type of Chinese story called Wuxia.
2.He came up ________ a good idea.
3.Father impressed _________ me the value of hard work.
4._______ the time he was 14, Mozart had composed many pieces for the harpsichord, piano and violin as well as for orchestras.
5.________ total, these astronauts have spent more than 26,000 days in space.
6.When he was orbiting in the capsule, he took photographs _____ planet earth.
查看答案和解析>>
科目：高中英语 来源：2015-2016学年河北广平第一中学高一下学期第一次月考英语卷（解析版） 题型：七选五
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。选项中有两项为多余选项。
Lazy people will never gain anything in life. However, laziness can be defeated once a few changes have been made in your mind.
1. Many people lack sleep constantly, since they stay up too late and get up too early to prepare for work. These people have little motivation once they arrive home. Laziness works hand in hand with a lack of motivation and a tendency to put off things. By adjusting your sleep schedule to provide a few more hours of meaningful rest, you can fight laziness throughout the day.
Another way to fight laziness is to change your mind from passive to active. Some people treat their lives as if they were pushed from task to task. Others take a more positive approach, viewing each task as a challenge they must overcome alone. 2.
Some people fight laziness by removing the temptations(诱惑) that surround them. A television in the living room may provide entertainment, but watching too much TV often contributes to laziness. 3. Complete a few tasks and reward yourself with what you enjoy, such as a good dinner or a film.
Laziness can also be a lasting problem at home. Couples and children may all have different energy levels, but laziness can be spread if not dealt with immediately. 4. Be the first to collect and wash dishes after a meal. Others in the home may eventually follow your example and perform their own task. It is difficult to practice laziness when you are surrounded by motivated people.
5. Enough exercise and a balanced diet can help you to develop a healthy lifestyle, thus enabling you to have more energy and help lift your spirits.
A. To fight family laziness, set an example.
B. Knowing how to fight laziness is important.
C. One way to fight laziness is to get enough sleep.
D. Finally, taking exercise regularly can help you fight laziness.
E. With strong determination, you will be able to achieve your goal.
F. Laziness appears when you no longer feel in charge of your own mind.
G. Create a reward system for yourself, just as parents do for a child.
查看答案和解析>>
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com
