The splendid aurora light displays that appear in Earth’s atmosphere around the north and south magnetic(磁的) poles were once mysterious phenomena. Now, scientists have data from satellites and ground-based observations from which we know that the aurora brilliance is a massive electrical discharge similar to that occurring in a neon sign.
To understand the cause of auroras, first picture the Earth enclosed by its magnetosphere(磁层), a huge region created by the Earth’s magnetic field. Outside the magnetosphere, rushing toward the earth is the solar wind, a speedily moving body of ionized(离子化的) gases with its own magnetic field. Charged particles(粒子) in this solar wind speed earthward along the solar wind’s magnetic lines of force. The Earth’s magnetosphere is a barrier to the solar winds, and forces the charged particles of the solar wind to flow around the magnetosphere itself. But in the polar regions, the magnetic lines of force of the Earth and of the solar wind gather together. Here many of the solar wind’s charged particles break through the magnetosphere and enter Earth’s magnetic field. They then rush back and forth between the Earth’s magnetic poles very rapidly and ionize and excite the atoms of the upper atmosphere of the Earth, causing them to produce aurora radiations of visible light.
The colors of an aurora depend on the atoms producing them. The leading greenish-white light comes from low energy excitation of oxygen atoms. During huge magnetic storms oxygen atoms also undergo high energy excitation and produce pink light. Excited nitrogen(氮) atoms contribute bands of color varying from blue to violet. Viewed from outer space, auroras can be seen as dimly shining belts wrapped around each of the Earth’s magnetic poles. Each aurora hangs like a curtain of light stretching over the polar regions and into the higher latitudes. When the solar flares(闪光) that result in magnetic storms and aurora activity are very strong, aurora displays may extend as far as the southern regions of the United States.
1.What is it that directly gives off aurora light?
A. The Earth’s magnetic field.
B. The solar wind’s magnetic field.
C. The Earth’s ionized particles.
D. The solar wind’s charged particles.
2.What does the third paragraph mainly discuss?
A. The appearance of auroras around the Earth’s poles.
B. The periodic change in the display of auroras.
C. The factors that cause the variety of colors in auroras.
D. The covering area of auroras based on their colors.
3.What can we infer from the passage?
A. The magnetosphere increases the speed of particles from the solar wind.
B. The color of greenish-white appears least frequently in an aurora display.
C. Earth’s magnetic field contributes to the variety and difference of aurora’s colors.
D. The strength of the solar flares has a positive effect on the extending distance of aurora.
天天向上一本好卷系列答案
小学生10分钟应用题系列答案科目：高中英语 来源：陕西省西安市2017届高三下学期第一次模拟英语试卷（word） 题型：阅读理解
Money is the root of all evil (邪恶) and new study claims there may be some truth behind the saying. Scientists at the University of California Berkeley, US, announced on February 27 that rich people are more likely to do immoral things, such as lie or cheat, than poorer people. The scientists did a series of eight experiments. They published their findings online in the Proceedings of the National Academy of Sciences (PNA《美国国家科学院院刊》).
They carried out the first two experiments from the sidewalk near Berkeley. They noted that drivers of newer and more expensive cars were more likely to cut off other cars and pedestrians at crosswalks. Nearly 45 percent of people driving expensive cars ignored a pedestrian compared with only 30 percent of people driving more modest cars.
In another experiment, a group of college students was asked if they would do immoral things in various everyday situations. Examples included taking printer paper from work and not telling a salesperson when he or she gave back more change. Students from higher-class families were more likely to act dishonestly.
According to the scientists, rich people often think money can get them out of trouble. This makes them less afraid to take risks. It also means they care less about other people's feelings.
Finally, it just makes them greedier. "Higher wealth status seems to make you want even more, and that increased want leads you to bend the rules or break the rules to serve your self-interest," said Paul Piff, lead scientist of the study.
Piff pointed out that the findings don't mean that all rich people are untrustworthy or all poor people honest. He said the experiments were to show how people living in different social situations express their instincts (本能) and values in different ways.
1.By saying "money is the root of all evil", the author wants to ________.
A. link wealth with bad behavior
B. draw readers' attention to the research
C. show how the saying proves the findings
D. defend rich people who do immoral things
2.According to the scientists, which is NOT the factor that makes rich people immoral?
A. They welcome risks.
B. They have more desires.
C. They believe money talks.
D. They become more selfish.
3.Why did the scientists do the experiments?
A. To show how social status affects people's morality.
B. To show people's instincts and values in different ways.
C. To test whether the saying "money is the root of all evil" is true.
D. To show the difference between higher-class people and lower-class people.
4.What does the passage really want to show us?
A. The poor are respectable.
B. Money is the root of all evil.
C. All rich people are untrustworthy.
D. The rich are more likely to act badly.
查看答案和解析>>
科目：高中英语 来源：河南师范大学附属中学2016-2017学年高一3月月考英语试卷 题型：完形填空
Last week I happened to find an old photo of myself and two of my oldest friends. It got me to think about all the crazy things I ______ with my friends. As kids, we ____ games and give them _____ like Sally Broke Her Leg and Guess Guess. In our teens, we fell off staircases and drank Coke. We sat on the roofs of Wits building talking about life, love and everything. Looking back now, it seems a lifetime ago, but memories like that ______ fade(逐渐消失). Over time, though, those daily ______ became less, then turned into occasional(偶尔的) emails, and they turned, finally into _______ .
My mom always said I can choose my friends, ________ I alone choose how long they stay in my life. Having let a dear friend of mine fade from my life ________ recently, I now understand what she ______ .
He was one of friends who will forever be stuck (陷住) in my ______ . I remembered that he wrote a book about his life at Wits and he wanted to _____ it to our old history professor, who called all the girls in the class “Sir”.
He got me to be ________ of sports and then I wanted to spend as much time doing it as possible. The benches outside of the William Cullen Library were _______ you could find us. If those benches could tell their stories they would _____ the pages of two novels.
A silly _________ between us led to the four-year friendship’s ________ . I felt sad because I did appreciate him. He was like one of those _______ friends who provided a shoulder to cry on even when he _____ one himself.
Life is difficult, but I should ______ every joke and every afternoon spent sitting on a bench. As my mom would say: a man with two real friends is _______ than a man with $100 million in the bank.
1.A. promised B. experienced C. planned D. discovered
2.A. gave up B. turned up C. used up D. made up
3.A. names B. answers C. numbers D. levels
4.A. just B. almost C. never D. already
5.A. exercises B. activities C. reports D. discussion
6.A. silence B. presence C. existence D. contact
7.A. and B. or C. so D. but
8.A. luckily B. quickly C. completely D. naturally
9.A. decided B. meant C. worried D. wanted
10.A. world B. progress C. life D. memory
11.A. award B. hand C. mail D. sell
12.A. short B. full C. fond D. sure
13.A. what B. where C. why D. how
14.A. fill B. cut C. cost D. follow
15.A. mistake B. conversation C. misunderstanding D. decision
16.A. ending B. lasting C. beginning D. finishing
17.A. ordinary B. interesting C. rare D. honest
18.A. found B. needed C. covered D. booked
19.A. create B. tell C. write D. value
20.A. richer B. stronger C. happier D. better
查看答案和解析>>
科目：高中英语 来源：吉林省2017届高三第五次模拟考试英语试卷 题型：短文填空
阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
I was nine years old when I learnt to ride a bike. The bike was a birthday present from my uncle. You can imagine how 1.(excite) I was when I saw the bike, and I begged my uncle to teach me how 2.(ride) it right away. However, before I got on the bike, I felt 3.(extreme) nervous and l was afraid that l would fall off and hurt 4. (me).My uncle held onto the seat and helped me to get 5. the bike. While l was riding, he was running along beside me, holding the seat so I would not fall over. I was so 6.(grate) to him for his help.
As I was practicing, I became more and more confident. Then, I heard my uncle shouting, "You are riding it by yourself now!" I was both excited and scared. I was really riding by myself, but 7. if I fell off? Could I use the brakes to stop? As I was wondering about this, my uncle ran after me and got hold of the bike. I 8.(slow) down and came to a stop. My heart was still beating fast when I got off the bike.9.(late) that day, having learnt how to get on the bike and get off it, I felt like l was walking on air! I am still thankful to my uncle for teaching me to ride a bike on my 10.(nine) birthday.
查看答案和解析>>
科目：高中英语 来源：重庆万州二中2016-2017学年高二下学期3月月考英语试卷 题型：书面表达
假定你是李华，你校摄影俱乐部（photography club）将举办国际中学生摄影展。请给你的英国朋友Peter写封信，请他提供作品。信的内容包括：
1.主题：环境保护
2.展览时间：
3.投稿邮箱：intphotoshow@gmschool.com
注意：
1.词数100左右；
2.可以适当增加细节，以使行文连贯。
查看答案和解析>>
科目：高中英语 来源：2017届甘肃省天水市、兰州市高三下学期一模考试英语试卷（解析版） 题型：短文改错
假定英语课上老师要求同桌之间交换修改作文，下文就是你同桌的一篇作文。文中共有10处语言错误，每句最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（＼）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；
2.只允许修改10处，多者（从第11处起）不计分。
Now I’d like to share with you a strange experience I had a month before.It may sound funny,and it’s true.After a day’s hard work I went to bed early than usual.It was about two o’clock in the morning,and suddenly I woke up.I heard a noise.I got out of bed and went slow downstairs.I listened carefully.I could heard two men speaking quietly.I believed two thieves had broken into my house and I was really frightened,so I went back to upstairs,and immediately phone the police from my bedroom.The police arrived quickly.They opened front door with a special key and went into the living room.You can imagine what embarrassed I was when they came upstairs and told me we had turned the television off for me and everything was all right.
查看答案和解析>>
科目：高中英语 来源：2017届甘肃省天水市、兰州市高三下学期一模考试英语试卷（解析版） 题型：阅读理解
Tyler was born infected with HIV and his mother was also infected. From the very beginning of his life, he was dependent on medications (药物) to enable him to survive. When he was five, he had a tube surgically(外科手术上) inserted in a vein(静脉) in his chest. This tube was connected to a pump, which he carried in a small backpack on his back. Medications were connected to this pump and were continuously supplied through this tube to his bloodstream. At times, he also needed supplemented oxygen to support his breathing.
Tyler wasn't willing to give up one single moment of his childhood to this deadly disease. It was not unusual to find him playing and racing around his backyard, wearing his backpack and dragging his tank of oxygen behind him in his little wagon(小推车). All of us who knew Tyler were amazed at his pure joy in being alive and the energy it gave him. Tyler's mom often made jokes on him by telling him that he moved so fast she needed to dress him in red. That way, when she peered through the window to check on him playing in the yard, she could quickly spot him.
This terrible disease eventually wore him down. He grew quite ill and, unfortunately, so did his HIV-infected mother. When it became clear that he wasn't going to survive, Tyler's mom talked to him about death. She comforted him by telling Tyler that she was dying too, and that she would be with him soon in heaven.
A few days before his death, Tyler beckoned(召唤) me over to his hospital bed and whispered, "I might die soon. I'm not scared. When I die, please dress me in red. Mom promised she's coming to heaven, too. I'll be playing when she gets there, and I want to make sure she can find me."
1.Why did Tyler wear a backpack on his back when he was young?
A. Because his mother gave it to him as a gift.
B. Because he had no right to choose but to wear it.
C. Because he wanted to be different from the other kids.
D. Because there was a pump in it, which could help with his disease.
2.Tyler asked the writer to dress him in red when he died in order to ________.
A. show red is his favorite color.
B. see the writer again in the hospital.
C. make his mother recognize him easily.
D. persuade his mother to keep her promise.
3.What’s Tyler’s attitude towards death?
A. Excited. B. Fearful. C. Doubtful. D. Optimistic.
4.What does the writer want to tell us by writing this passage?
A. Even a child can teach us a lot.
B. Patients should be treated with respect.
C. People should have great courage to face the problems.
D. We should try our best to help those who are infected with HIV.
查看答案和解析>>
科目：高中英语 来源：广东省广州市2017届高三下学期第一次模拟考试英语试卷 题型：阅读理解
Inside the Rain Room
The Rain Room has arrived and local art lovers are taking notice. Is it worth the wait? Yes, I assure you it is. Once inside, visitors find a long, dark room with a high ceiling. A single bright light shines through heavy rain falling around visitors. The mist. The damp air. The noise. It feels like a mighty storm is pouring down. But the storm is inside. And visitors aren’t getting wet. Instead, visitors wander in awe, admiring the rain and the artists who created it.
The Rain Room was created to highlight the connection between humans, nature and technology. With a tracking system that senses movement and stops the rain wherever visitors move, it does just that. Light and sound produce an experience that feels both natural and foreign. The exhibit is moving on to Atlanta next month. I urge you to visit before then. It’s time to experience the Rain Room for yourself!
Welcome to the Rain Room
• The Rain Room features falling water. Please be aware you may get slightly wet. However, visitors wearing raincoats will be turned away.
• This exhibit features advanced technology. To ensure its effectiveness, please avoid wearing dark or reflective clothing.
• Visitors are welcome to take photographs of the exhibit.
• Children must be accompanied by an adult.
• For the convenience of all guests, visits are limited to 10 minutes.
1.What’s the purpose of the text?
A. To attract visitors to a new art exhibit.
B. To explain how an exhibit has been created.
C. To describe the technology used in the exhibit.
D. To promote the artists taking part in an exhibit.
2.What’s the function of the exhibit’s tracking system?
A. To keep visitors from getting wet.
B. To protect the exhibit from water damage.
C. To time how long visitors are in the room.
D. To count the number of visitors in the room.
3.What must you do when visiting the Rain Room?
A. Wear a raincoat.
B. Wear dark clothing.
C. Leave your camera outside.
D. Pass through within 10 minutes.
查看答案和解析>>
科目：高中英语 来源：宁夏固原市2017届高三下学期第一次月考英语试卷 题型：完形填空
You may be surprised to see “making sure children never suffer” as a mistake. The following may help you understand how rescuing children from all suffering weakness.
A little boy felt sorry for a butterfly struggling to from its chrysalis. He decided to the butterfly. So he peeled the chrysalis open for the butterfly. The little boy was so to watch the butterfly spread its wings and fly off into the sky. Then he was horrified he watched the butterfly fall to the ground and die because it did not have the muscle to keep flying. In fact, the butterfly’s struggle to the chrysalis helps the butterfly become stronger.
Like the little boy, too often want to protect their children from struggle in the of love. They don’t realize that their children need to struggle, to experience , to deal with disappointment, and to solve their own problems. Only in this way can children their emotional strength, become and develop the skills necessary for the even bigger struggles they will meet throughout their lives. Children experiencing sufferings can the ups and downs of life.
However, it isn’t helpful either in this case when parents lectures(训斥), blame and shame to what the child is experiencing. Mothers to say, “Stop crying and acting like a spoiled boy. You can’t always get what you want.” These words should be avoided.
Instead, parents can offer loving support. You can say, “Don’t lose . Be brave! You will succeed if you try again.” Then comes the tough part—no a no lectures. Simply allow him to discover that he can get over his disappointment and what he can do to get what he wants in the future.
1.A. story B. proverb C. saying D. Experiment
2.A. damages B. burns C. creates D. experiences
3.A. hear B. suffer C. date D. emerge
4.A. kill B. feed C. help D. rescue
5.A. excited B. moved C. puzzled D. depressed
6.A. as B. since C. before D. until
7.A. power B. energy C. strength D. force
8.A. come up B. do away with C. get along with D. break away from with
9.A. teachers B. parents C. relatives D. friends
10.A. case B. charge C. name D. course
11.A. friendships B. scholarships C. relationships D. hardships
12.A. strengthen B. require C. get D. achieve
13.A. warm-hearted B. strong-willed C. absent-mind D. cold-blooded
14.A. expect B. predict C. survive D. avoid
15.A. add B. adapt C. devote D. contribute
16.A. pretend B. happen C. tend D. seem
17.A. discouraging B. inspiring C. interesting D. touching
18.A. heart B. face C. sight D. weight
19.A. parking B. smoking C. drinking D. rescuing
20.A. figure out B. carry out C. rule out D. drop out
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
