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.
高二英语阅读理解困难题
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.
高二英语阅读理解困难题查看答案及解析
When the spaceship traveled above,______new looking earth appeared before us,______earth that we had never seen before.
A. a;the B. the;an C. /;the D. a;an
高二英语单项填空简单题查看答案及解析
When we look at the sky and see a bright light moving quickly across it or coming towards the earth, we talk about seeing a “shooting star” or a “falling star”. These moving lights are not, in fact, stars at all. They are small pieces of matter from outer space, which burn up as they enter the Earth’s atmosphere. The correct name of them is meteoroids. Any pieces that make it to the Earth’s surface without completely burning up are known as meteorites. A meteor is actually the name given to the light we see when a meteoroid is burning up.
When a meteorite hits the Earth at speeds between 11 and 72 kilometers a second, it can do amazing damage. A very large meteorite could knock the earth out of its orbit. If this happened, all life on Earth would probably become extinct(灭绝). The path we follow around the Sun would change and as a result the Earth would become either much hotter or much colder. This change in temperature would affect sea levels and the amount of water in rivers. There would either be huge floods, which would cover most of the land with water, or the oceans would dry up and there would be a drought, which means a long period of time without rain. Either way, nothing could survive. If a large meteorite landed in the sea it would almost certainly cause tsunamis, which would race towards the land, destroying everything in their paths.
Although it is unlikely the Earth will be struck by a meteorite large enough to do that kind of damage, there is evidence of fairly large meteorites hitting the Earth in the past. In 1908 a large area of forest in Tunguska, Siberia was destroyed by a meteorite that came apart just before it hit the ground. The moon, however, has about three billion craters陨石坑caused by meteorites impacting影响 its surface. The reason more meteorites have reached the surface of the moon than the surface of the Earth is that the moon does not have enough atmosphere for the meteorites to burn up in. some of the meteorites that have reached the Earth’s surface have done considerable damage. Some scientists believe it was a change of climate caused by meteorites hitting the Earth that resulted in the extinction of the dinosaurs and other large prehistoric animals.
Scientists are especially interested in meteorites because they contain information about the solar system. It is widely believed by scientists that most meteorites are produced by collisions(碰撞) between asteroids (small planets). These collisions probably happened many billions of years ago. This means the physical and chemical structure of a meteorite can give scientists information about the early days of the universe.
1.The story is about ___.
A.floods caused by meteors |
B.matter from outer space |
C.life on Earth millions of years ago |
D.meteorites that have damaged the moon |
2.The Earth has ___.
A.three billion craters |
B.fewer craters than the moon |
C.more craters than the moon |
D.a thinner atmosphere than the moon |
3.Some scientists believe the dinosaurs became extinct because ___.
A.they were hit by meteors |
B.meteorites landed on their nests |
C.meteorites landed and changed the climate |
D.they could no longer breathe the atmosphere |
4.Meteors are ___.
A.small planets |
B.the same as asteroids |
C.from broken parts of asteroids |
D.the light we see when meteoroids hit our atmosphere |
高二英语阅读理解困难题查看答案及解析
Many people agree that never in history _________a more splendid opening ceremony than that of the Beijing Olympics
A.there were B.has there been C.there has been D.were there
高二英语单项填空中等难度题查看答案及解析
Global warming happens when greenhouse gases trap heat and light from the sun in the earths 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.
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.
2. The underlined wordit in Paragraph 2 refers to__________.
A. light B. greenhouse effect
C. temperature D. heat
3. What is the effect of atmosphere?
A. It only traps the heat of the sun.
B. It does great harm to humans.
C. It makes the earth neither too hot nor too cold.
D. It prevents all the light from the sun shining on the earth.
4. What is the main idea of the third paragraph?
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.
5. What will the author most probably discuss in the paragraph that follows?
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.
高二英语阅读理解中等难度题查看答案及解析
Global warming happens when greenhouse gases trap heat and light from the sun in the earths 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.
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.
2.The underlined worditin Paragraph 2 refers to__________.
A. light B. greenhouse effect
C. temperature D. heat
3.What is the effect of atmosphere?
A. It only traps the heat of the sun.
B. It does great harm to humans.
C. It makes the earth neither too hot nor too cold.
D. It prevents all the light from the sun shining on the earth.
4.What is the main idea of the third paragraph?
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.
5.What will the author most probably discuss in the paragraph that follows?
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.
高二英语阅读理解简单题查看答案及解析
Global warming happens when greenhouse gases trap heat and light from the sun in the earths 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.
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.
2. The underlined wordit in Paragraph 2 refers to__________.
A. light B. greenhouse effect
C. temperature D. heat
3. What is the effect of atmosphere?
A. It only traps the heat of the sun.
B. It does great harm to humans.
C. It makes the earth neither too hot nor too cold.
D. It prevents all the light from the sun shining on the earth.
4. What is the main idea of the third paragraph?
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.
5. What will the author most probably discuss in the paragraph that follows?
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.
高二英语阅读理解中等难度题查看答案及解析
I’m looking for an opportunity to display my _____ in advertising.
A.mood B.appearance C.talent D.character
高二英语单项填空简单题查看答案及解析
语法填空
Wikipedia says that a hero is “a character who, in the face of danger,displays courage and the will to sacrifice himself”.
A dictionary defines a hero 1. “a person who is admired for great or brave acts or fine qualities”.
To me, a person's hero is someone they can rely on, someone providing endless 2. (encourage) and unconditional love and someone who sticks to you through thick and thin, and 3.keep) sticking to you even when you want them to leave.
For me, that person is my grandma. 4. was always my supporter. My grandma lived through death and loss, 5. woke up every morning with a smile on her face. She lived 1,729 miles away, yet managed 6.(visit) us four times a year.
She taught for 34 years , and was the one who instilled(逐渐灌输) the love of writing into me. Always encouraging me to write, she 7.(help) me grow as a person. Of the 8. (lesson) she taught me, the one I will always remember is 9. I should live a happy life, go about everything with a smile and never take myself too 10. (serious).
So, here's to my grandma, my hero, my support group, and my best friend.
高二英语语法填空中等难度题查看答案及解析
One ________to the accident said that the car was racing at full speed and that the driver appeared to be drunk.
A.companion | B.judge | C.witness | D.student |
高二英语单项填空中等难度题查看答案及解析