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Hacking isn’t just for computers and smart phones. According to a study, scientists have found a way to hack a plant’s genes in order to make it use sunlight more quickly. Someday, the results could increase the number of food produced around the world.
Scientists used tobacco plants in the study because it is easy to change the plants’ genes. Hacked plants are larger than normal plants.
Photosynthesis is the word used to describe how plants use sunlight, water and carbon dioxide to make their own food. Scientists say this is a very slow process. Plants use less than 1 percent of the energy. But by hacking a plant’s genes, the scientists were able to increase the amount of leaf growth on plants between 14 and 20 percent. Scientists hacked the plant’s protective system. Normally, this system starts when a plant gets too much sunlight When the plant senses the light, it creates more leaves. When the plant is in shade, the protective system is turned off. But the process is slow.
The new study sped up the process by changing the plant’s genes, the protective system turned on and off more quickly than normal. As a result, leaf growth on the plants scientists used in the study increased. Leaf growth on two plants increased by 20 percent, while leaf growth on a third plant increased by 14 percent. Scientists conducted the study on tobacco plants. But they think the genetic changes would produce the same results in corn and rice.
Agriculture professor Tala Awanda said the study makes sense，but cautioned the yield（产量）might not be quite so high for conventional food crops. Still，she added in an email,” this study remains a breakthrough,”
1.Which of the following is true according to Paragraph 1 ?
A. We can find hacking only in digital devices.
B. A plant’s genes can be changed by hacking.
C. Hacking has been used in improving food production.
D. Hacking can be used to change whatever you want.
2.Why did scientists choose tobacco plants to study?
A. Because they are very easy to get.
B. Because their genes are easy to change.
C. Because they are larger than other plants.
D. Because they can absorb sunlight quickly.
3.What do we know about photosynthesis?
A. It helps plants to produce energy.
B. It is regarded as a productive system for plants.
C. It can increase leaf growth on plants by 14 percent.
D. It is made up of sunlight，water and carbon dioxide.
4.We can learn from Paragraph 4 that changing the plants' genes proved____.
A. useless B. deadly
C. effective D. unrealistic
5.What is Tala Awanda’s attitude toward the study?
A. Doubtful. B. Neutral.
C. Objective. D. Critical.
高三英语阅读理解困难题查看答案及解析
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One in four children and young people could have problematic smart-phone use, according to research that also suggests such behaviour is associated with poorer mental health.
The amount of time children and teens spend using their devices has become an issue of growing concern, but experts say there is still little evidence as to whether spending time on screens is harmful in itself.
The experts behind the latest study said they wanted to look beyond the time young people were spending on smart-phones and instead explore the type of relationship they had with smart-phones.
The results suggest more than 23% of young people have an abnormal relationship with their smart-phones, and that this appears to be associated with poorer mental health-although the research cannot say whether phone use is driving such problems.
“It seems like only a minority of teenagers and young people from various different countries are self-reporting a pattern of behaviour that we recognise from other addictions,” said Dr Nicola Kalk of King’s College London, co-author of the study. “The quality of the evidence is poor, but it is enough to warrant (保证) further investigation.”
Writing in the journal BMC Psychiatry, the team reported how they looked at data from 41 studies involving a total of almost 42,000 participants across Europe, Asia and America, mainly in their teens or early 20s.
These studies used questionnaires to probe the prevalence (普遍) of problematic smart-phone use-behaviours such as being anxious when the device is not available or neglecting other activities to spend time on the smart-phone.
Taken together, the team said on average these studies suggested as many as one in four children and young people had problematic smart-phone use.
Among the studies that probed mental health, the results suggested people with problematic smart-phone use were also more likely to have depression-for which the odds (可能性) were more than three times worse-anxiety, feelings of stress and poor sleep as well as poorer educational attainment.
While the team said it was too soon to call problematic smart-phone usage an addiction, they noted that it appeared to be linked to similar patterns of behaviour and emotion.
Kalk said further studies were needed to explore if these behaviours were hard to break, or cause harm-other key features of an addiction.
The authors argued that the availability and pervasiveness of smart-phones in everyday life meant problematic use of the devices posed a different and much bigger public health problem than substances of abuse or internet gaming.
Kalk said the team were now looking at whether smart-phones were just delivering addictive content, or whether there was something inherently addictive about using such devices.
Dr Amy Orben, an expert in screen time at the University of Cambridge, raised concerns, noting that the definition of problematic internet use varied considerably across studies, and the measures used were questioned.
She said studies finding little signs of problematic internet use might have been overlooked, while the research could not say whether problematic smart-phone use caused poorer mental health.
Prof Russell Viner, President of Royal College of Paediatrics and Child Health, said that parents were navigating unchartered water when it came to technology.
“One of the most critical things for parents to consider is whether screen time is having a harmful impact on other activities like school, relationships or other interests. This study suggests that this is the case for a significant minority of children and young people,” he said.
Viner said in these cases parents should calmly install age-appropriate boundaries on smart-phone use, and ask questions about whether their children were experiencing other problems.
“While screen time is a new problem, part of the solution is tried and tested-open and regular conversations based on respect and trust,” he said.
1.Experts conducted the research to ______.
A.address the concern about adolescent behavior
B.prove spending time on screens is harmful in itself
C.calculate the time young people spent on smart-phones
D.explore young people’s relationship type with smart-phones
2.We can learn from the research that ______.
A.it involved a vast majority of participants across the globe
B.the participants were asked to report their online activities
C.researchers compared different behaviors of the participants
D.problematic smart-phone use is linked to poorer mental health
3.Which of the following might Kalk probably agree?
A.It is hard to break problematic smart-phone use.
B.Internet gaming is problematic smart-phone use.
C.Problematic smart-phone use is an addiction.
D.The research still has some limitations.
4.What’s Dr Amy Orben’s attitude towards the research findings?
A.Supportive. B.Negative.
C.Sceptical. D.Unconcerned.
5.What does the underlined part in Paragraph 16 mean?
A.Screen time is a new challenge to parents.
B.Technology is posing a threat to parents.
C.Parents are lost in the sea of technology.
D.Parents use technology to chart water.
6.According to Viner, what should parents do to solve the problem?
A.Keep track of the screen time of children.
B.Strictly prohibit children from using devices.
C.Have a sincere communication with children.
D.Evaluate the impact of screen time on children.
高三英语阅读理解困难题查看答案及解析
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Today, children start to use computers, smart phones and tablets from a very young age． Many parents and child experts believe that this is very wrong． They claim that early exposure to technology can make individuals lazy and distracted． That may be true, but there it is practically impossible to change the world we live in now． What we can do is embrace smart mobile technologies the best way we can． That is Microsoft’s Windows 8 App Store． One of its applications is entirely educational, Windows 8． There, students of all ages can find apps that can greatly help them in their studies． We have prepared the 4 best of them．
Wikipedia—Wikipedia is the first place where students search for information． The articles on the popular website are updated regularly and they include many details, figures and resources． With this app, you can access Wikipedia faster than ever．
SAS Flash Cards—One of the most effective ways to learn your school or university material is by using the so-called “flash cards”． This app, however, allows users to create an entire set of cards in a matter of minutes． Also, the cards can be divided into different subject categories, which makes studying easier and more fun than ever before．
Kindle Reader—If you don't have a Kindle e-Book reader, you can use your Windows 8 device． Just install this app and the Kindle word will land in your smart phone, tablet or laptop． With the Kin-die Reader W8 app, you can also organize and store all of your favorite books．
My Study Life—This application is the mobile version of the website My Study Life． The app can be very useful for students in terms of school and university organization． There you can store all the information you want like homework, assignments and papers． In addition, you can create your own school calendar that will remind you of your upcoming exams, for instance．
There is one main reason why these Windows 8 apps are appropriate for students． Apart from useful, they are completely free! All you need to do is go to Microsoft’s Windows 8 App Store, download the applications you want and install them onto your device．
1.The underlined part means we should __________．
A． update the technologies as often as we can
B． accept the smart mobile applications willingly
C． purchase a smart mobile with much money
D． develop some new smart mobile functions
2.If you want to know of Rafael Nadal you can use __________．
A． Wikipedia B． SAS Flash Cards C． Kindle Reader D． My Study Life
3.The function of “flash cards” is __________．
A． to make your smart phone closely attached
B． to update your information every day
C． to help you get your favorite reading materials
D． to help students learn their subjects easily
4.We can learn from the passage that __________．
A． students can buy the apps at a certain discount
B． the applications above are all for nothing
C． you should pay much to download the apps
D． It’s easy for parents to keep a watch on their children
5.Which of the following is the best title for the passage?
A． Top Windows 8 Apps for Students
B． Windows 8 to Be Updated for Students
C． Games Apps in Windows 8 Store
D． Microsoft Company and Its Apps
高三英语阅读理解中等难度题查看答案及解析
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When I was a boy there were no smart phones. Computers were something you saw on STAR TREK(星际航行)，and our television only got one channel clearly. Still, I was never bored. The fields, hills, and woodlands around my house were the nature ready-made playgrounds.
I can remember once hiking to a nearby lake and slowly walking around it. At the backside of it I was amazed to find an old, one-lane, dirt road that I had never seen before. I immediately set out to travel it. It was full of holes and muddy tracks and deep woods bordered it on both sides, but exploring it still seemed like a fine adventure.
I walked on and on for what seemed like hours. I was sure my guardian angel was whispering in my ear to turn around and head back home but I was stubborn and even a bit stupid, so I walked on.
The dirt road give way to a rock one and then a paved one, yet there was still neither a car nor a house in sight. My legs were getting tired. I noticed that the sun was starting to go down and I grew scared. I didn’t want to end up trapped on this road in the dark of night, but I was sure it would be dark before I could make my way back to the lake again.
I was almost in tears when I turned one last curve(弯曲处) and saw something in the distance. It was a house that I recognized. My heart leapt up! I jumped up and down and laughed out loud. I knew the way home! It was still over a mile away but my legs felt like feathers and I hurried back to my house in no time. I walked in with a big smile on my face just in time for dinner.
I remembered this recently when I saw a sign that said, “All roads lead Home.” This is true. In this life all roads no matter what their twists(弯曲) and turns are can lead us home again. They can lead us to our homes here on Earth. They can lead us to our homes in our heart, if we can insist.
1.Why was the author never bored when he was a boy?
A. Because there was still a TV.
B. Because he liked hiking alone.
C. Because there were so many playgrounds built for him.
D. Because he had so many places around his house to play.
2.What made the author decide to take the old road?
A. Seeing it before.
B. That it was a muddy road.
C. Trying a new and special experience.
D. That it had deep woods on both sides.
3.How did the author feel when he saw a known house in the distance?
A. Excited. B. Frightened.
C. Touched. D. Desperate.
4.Why did the author mention the sign?
A. To share a famous saying with readers.
B. To introduce what he wanted to say.
C. To explain the function of the sign.
D. To prove the significance of the sign.
高三英语阅读理解中等难度题查看答案及解析
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When I was a boy there were no smart phones, computers were something you saw on STAR TREK, and our television only got one channel clearly. Still, I was never bored. The fields, hills, and woodlands around my home were the perfect playgrounds whose adventures were only limited by my imagination. I can remember once hiking to a nearby lake and slowly walking around it. At the backside of it I was amazed to find an old, one lane, dirt road that I had never seen before. I immediately set out to travel it. It was full of muddy tire tracks and deep woods bordered it on both sides, but exploring it still seemed like a fine adventure.
I walked on and on for what seemed like hours. I am sure my guardian angel was whispering in my ear to turn around and head back home but I was stubborn and even a bit stupid, so I walked on. The dirt road gave way to a gravel one and then a paved one, yet there was still neither a car nor a house in sight. My legs were getting tired. I noticed that the sun was starting to go down and I grew scared. I didn’t want to end up trapped on this road in the dark of night, but I was sure it would be dark before I could make my way back to the lake again.
I continued to walk on with the something growing inside of me. My heart was pounding and my legs were aching. I was almost in tears when I turned one last curve and saw something in the distance. It was a house that I recognized. My heart leapt up! I jumped up and down and laughed out loud. I knew the way home! It was still over a mile away but my legs felt like feathers and I hurried back to my house in no time. I walked in with a big smile on my face just in time for dinner. Then I ended my adventure with a good night’s sleep.
I often thought of that experience recently. Actually, in our life, all roads, no matter how they twist and turn, can lead us home again. They can lead us to our homes here on Earth. They can lead us to our homes in our hearts. May you always walk your path with love. May you always help your fellow travelers along the way. And may your roads always lead you Home again.
1.Why did the author hardly feel bored when he was young?
A. He could watch TV all day. B. He could have fun in nature.
C. He had many friends to play with. D. He used to explore the old dirt road.
2.What does the underlined word “something” in Paragraph 3 probably refer to?
A. Doubt. B. Hope. C. Fear. D. Courage.
3.How did the author feel when he was exploring the dirt road?
A. He was contradictory in mind. B. He was unconscious of danger ahead.
C. He was worried to be trapped in the woods. D. He was afraid of being scolded by his parents.
4.What may be the best title for the passage?
A. Every Effort Is Worthwhile B. All Roads Lead Home
C. Be Determined in Your Life D. Be Brave to Explore
高三英语阅读理解中等难度题查看答案及解析
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—I guess you can buy such a smart phone for 300 dollars.
—I could just two months ago，but the price ________ by 20%.
A．went up B．had gone up
C．has gone up D．goes up
高三英语单项填空中等难度题查看答案及解析
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—I guess you can buy such a smart phone for 300 dollars.
—I could just two months ago，but the price ________ by 20%.
A．went up B．had gone up
C．has gone up D．goes up
高三英语单项填空中等难度题查看答案及解析
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_____ on smart phones for communication, relaxation and information that people play phones while walking and eating.
A.Such is the dependence B.Such dependence does
C.So they are dependent D.So did they depend
高三英语单项填空中等难度题查看答案及解析
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“Smombies”—people walking while staring at their smart phones—are very real and a growing cause for concern. Tired of having to constantly alert both locals and tourists to pay more attention to their surroundings to avoid serious accidents, authorities of a small German town have come up with a more positive solution—embedding(嵌入) traffic lights in the pavement to make them visible to people constantly looking down at their phones.
The seemingly ridiculous safety measure was put in place. Authorities in Augsburg decided to act, installing ground level traffic lights at two tram(有轨电车) stops last Tuesday. The lights flash red every time a tram is approaching, or when the regular traffic light turns red. “We realized that the normal traffic light isn't in the line of sight of many pedestrians these days，” said Tobias Hermes, a city administration official. “So we decided to have an additional set of lights—the more we have, the more people are likely to notice them.”
Some Augsburg residents appear to be quite happy with the idea.“I think it makes sense，” Jack Smith said, speaking to The Augsburger All
gemeine. “One always sees young people these days running over red lights. This makes it more obvious that you need to stop.”Others, however, found the need for ground traffic lights disturbing and even frightening. “I find it scary that smart phone users are so engrossed that they need to install lights in the ground so that they notice the tram coming，” one person told the local paper.
But do this kind of pavementembedded lights actually
work? Well, if one interviewed teenager is to be believed, not really. “To be honest I didn't even notice it，” he told The Augsburger Allgemeine. “Maybe it'd be useful at night, but yeah, I didn't realize it was there until just now.”The word “smombie”—a mashup of the words smart phone and zombie—was born in Germany. It was voted “youth word of the year” in 2015, but the serious consequences of this behaviour are no laughing matter.
1.Which of the following about “smombies” is TRUE?
A. It refers to people who are fond of walking.
B. It refers to people who are looking at phones while walking.
C. It refers to people who concern others very much.
D. It refers to people who hate locals and tourists.
2.Which of the following can replace the underlined word “engrossed” in Paragraph 4?
A. Disturbed. B. Frightened.
C. Addicted. D. Encouraged.
3.What may be the best title for the text?
A. Ground traffic lights for people looking at smart phones
B. Effective ways to educate people to obey traffic rules
C. The meanings of ground traffic lights
D. The serious problem of traffic safety
高三英语阅读理解中等难度题查看答案及解析
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Nowadays smart phones have_____. There is a growing need for them and many companies are trying to launch a new generation of it.
A.come about B.gone up C.checked out D.taken off
高三英语单项填空中等难度题查看答案及解析
gemeine. “One always sees young people these days running over red lights. This makes it more obvious that you need to stop.”
work? Well, if one interviewed teenager is to be believed, not really. “To be honest I didn't even notice it，” he told The Augsburger Allgemeine. “Maybe it'd be useful at night, but yeah, I didn't realize it was there until just now.”