How the Grand Canyon (大峡谷) was created remains one of the geology’s greatest mysteries. Some evidence suggests that the process was a gradual one in which the Colorado River (which runs through the canyon) slowly cut deeper and deeper into the ground over millions of years. But volcanic rock samples taken from the canyon now suggest that the canyon was down-cut instead.
Down-cutting is when a flood of water rushes over a landscape (地形) with enough force to cut deeply into the ground and leaves behind a canyon. Such a flood is usually released when a natural or man-made dam (堤坝) bursts.
Robert Webb, a research geologist, says natural dams seem to have formed and broken across the Colorado River several times during the last million years. The dams were built when lava(熔岩) from the eruptions of nearby volcanoes flowed into the river. The lava hardened into hard rocks and blocked the river, causing it to back up and form a lake. Each time the lake grew so huge that it broke the rock dam, releasing a flash flood that furthered the down-cutting process and deepened the canyon.
Down-cutting is not just an earthly event. Satellite photos sent back from Mars suggest that the process has happened there, too, say many other researchers.
The photos, taken by the Mars Global Surveyor, indicate that an enormous lake existed on Mars 3.5 billion years ago. The lake spilled into a large nearby hole. One edge of the hole broke, releasing a flash flood that quickly carved out a grand canyon.
The existence of down-cutting on Mars is just one more piece of evidence that the cold, dry planet was once warm and wet.
1.In the past, deep canyons were believed to have formed _______.
A. as a result of a sudden break of volcanoes
B. due to river flows over millions of years
C. owing to the burst of artificial dams
D. thanks to our ancestors’ creative work
2.According to the passage, which of the following statements is TURE?
A. Several volcanoes broke out on Mars directly creating grand canyons.
B. Several great lakes existed on the upper parts of the Colorado River.
C. People built high dams on the upper parts of the Colorado River.
D. The Colorado River crossed the Grand Canyon to form down-cutting.
3.From the last three paragraphs we learn that _______.
A. there are great lakes on Mars
B. there are active volcanoes on Mars
C. there might be cities on Mars
D. there might be life on Mars
4.The passage can be titled as _______.
A. Lakes on Earth and Mars
B. The Cause of Lake Formation
C. The Force of Dam Breaking
D. Canyons—Results of Flood Cutting
高一英语阅读理解中等难度题
How the Grand Canyon (大峡谷) was created remains one of the geology’s greatest mysteries. Some evidence suggests that the process was a gradual one in which the Colorado River (which runs through the canyon) slowly cut deeper and deeper into the ground over millions of years. But volcanic rock samples taken from the canyon now suggest that the canyon was down-cut instead.
Down-cutting is when a flood of water rushes over a landscape (地形) with enough force to cut deeply into the ground and leaves behind a canyon. Such a flood is usually released when a natural or man-made dam (堤坝) bursts.
Robert Webb, a research geologist, says natural dams seem to have formed and broken across the Colorado River several times during the last million years. The dams were built when lava(熔岩) from the eruptions of nearby volcanoes flowed into the river. The lava hardened into hard rocks and blocked the river, causing it to back up and form a lake. Each time the lake grew so huge that it broke the rock dam, releasing a flash flood that furthered the down-cutting process and deepened the canyon.
Down-cutting is not just an earthly event. Satellite photos sent back from Mars suggest that the process has happened there, too, say many other researchers.
The photos, taken by the Mars Global Surveyor, indicate that an enormous lake existed on Mars 3.5 billion years ago. The lake spilled into a large nearby hole. One edge of the hole broke, releasing a flash flood that quickly carved out a grand canyon.
The existence of down-cutting on Mars is just one more piece of evidence that the cold, dry planet was once warm and wet.
1.In the past, deep canyons were believed to have formed _______.
A. as a result of a sudden break of volcanoes
B. due to river flows over millions of years
C. owing to the burst of artificial dams
D. thanks to our ancestors’ creative work
2.According to the passage, which of the following statements is TURE?
A. Several volcanoes broke out on Mars directly creating grand canyons.
B. Several great lakes existed on the upper parts of the Colorado River.
C. People built high dams on the upper parts of the Colorado River.
D. The Colorado River crossed the Grand Canyon to form down-cutting.
3.From the last three paragraphs we learn that _______.
A. there are great lakes on Mars
B. there are active volcanoes on Mars
C. there might be cities on Mars
D. there might be life on Mars
4.The passage can be titled as _______.
A. Lakes on Earth and Mars
B. The Cause of Lake Formation
C. The Force of Dam Breaking
D. Canyons—Results of Flood Cutting
高一英语阅读理解中等难度题查看答案及解析
Experience the newly opened Grand Canyon (大峡谷) West Skywalk in Colorado. Departing(离开) from Grand Canyon’s South Rim(外边缘) by Airplane to Grand Canyon’s West Rim, you will land and take a ground tour to the Skywalk! Walk on air for 70 feet over the edge(边缘) of Grand Canyon West.
This Skywalk has been open since March 28, 2007. Daily visitorship to the Skywalk has been over 4,000 people. Please be patient to enjoy your moment on the Skywalk.
After you have experienced the one and only Grand Canyon Skywalk Glass Bridge, you will return to the Grand Canyon West Airport and take your Airplane for a flight back to the South Rim of the Canyon. This is a tour never to be forgotten as you will have walked on air over the Grand Canyon.
Tour Itinerary (行程)
Tour Duration(持续时间) | 5.7 Hours | The Grand Canyon Adventure Skywalk |
Flight from Grand Canyon South Rim to Grand Canyon West | 1 Hour | Experience a bird’s-eye view of the Grand Canyon as you make your way to Grand Canyon West. |
Light Lunch at Guano Point at Grand Canyon West | 2 Hours | You’ll be taken by bus to Guano Point with breathtaking(令人惊叹的) views of the western part of the Grand Canyon where the Calorado River makes its way into Lake Mood. Every table for lunch has a view. |
Walk on the World Famous Skywalk | 1.5 Hours | Finally you’ll board(登上) your bus to Eagle Point, home of the Grand Canyon Skywalk. Now it is time for you to walk on air for 70 feet over the Grand Canyon. |
Flight Back to Grand Canyon South Rim | 1.2 Hours | After time on the Skywalk, you’ll return to the Grand Canyon West Airport and return to Grand Canyon South Rim in time for dinner and sunset. |
1. This advertisement is for __________.
A. Grand Canyon West B. Grand Canyon South
C. the Skywalk D. Grand Canyon
2. The package fee does NOT cover the cost of _______.
3.The Grand Canyon Skywalk Bridge is made of glass because ______.
A. it looks stranger
B. it gives you a better view
C. it looks more beautiful
D. it is cheaper to build
4.According to the Tour Itinerary, the route is ______.
A. South Rim→Guano Point→West Airport→Eagle Point→West Airport→South Rim
B. South Rim→West Airport→Eagle Point→West Airport→Guano Point→South Rim
C. South Rim→West Airport→Eagle Point→Guano Point→West Airport→South Rim
D. South Rim→West Airport→Guano Point→Eagle Point→West Airport→South Rim
高一英语阅读理解中等难度题查看答案及解析
Experience the newly opened Grand Canyon (大峡谷) West Skywalk in Colorado. Departing(离开) from Grand Canyon’s South Rim(外边缘) by Airplane to Grand Canyon’s West Rim, you will land and take a ground tour to the Skywalk! Walk on air for 70 feet over the edge(边缘) of Grand Canyon West.
This Skywalk has been open since March 28, 2007. Daily visitorship to the Skywalk has been over 4,000 people. Please be patient to enjoy your moment on the Skywalk.
After you have experienced the one and only Grand Canyon Skywalk Glass Bridge, you will return to the Grand Canyon West Airport and take your Airplane for a flight back to the South Rim of the Canyon. This is a tour never to be forgotten as you will have walked on air over the Grand Canyon.
Tour Itinerary (行程)
Tour Duration(持续时间) | 5.7 Hours | The Grand Canyon Adventure Skywalk |
Flight from Grand Canyon South Rim to Grand Canyon West | 1 Hour | Experience a bird’s-eye view of the Grand Canyon as you make your way to Grand Canyon West. |
Light Lunch at Guano Point at Grand Canyon West | 2 Hours | You’ll be taken by bus to Guano Point with breathtaking(令人惊叹的) views of the western part of the Grand Canyon where the Calorado River makes its way into Lake Mood. Every table for lunch has a view. |
Walk on the World Famous Skywalk | 1.5 Hours | Finally you’ll board(登上) your bus to Eagle Point, home of the Grand Canyon Skywalk. Now it is time for you to walk on air for 70 feet over the Grand Canyon. |
Flight Back to Grand Canyon South Rim | 1.2 Hours | After time on the Skywalk, you’ll return to the Grand Canyon West Airport and return to Grand Canyon South Rim in time for dinner and sunset. |
1.This advertisement is for __________.
A. Grand Canyon West B. Grand Canyon South
C. the Skywalk D. Grand Canyon
2. The package fee does NOT cover the cost of _______.
3. The Grand Canyon Skywalk Bridge is made of glass because ______.
A. it looks stranger B. it gives you a better view
C. it looks more beautiful D. it is cheaper to build
4.According to the Tour Itinerary, the route is ______.
A. South Rim→Guano Point→West Airport→Eagle Point→West Airport→South Rim
B. South Rim→West Airport→Eagle Point→West Airport→Guano Point→South Rim
C. South Rim→West Airport→Eagle Point→Guano Point→West Airport→South Rim
D. South Rim→West Airport→Guano Point→Eagle Point→West Airport→South Rim
高一英语阅读理解困难题查看答案及解析
Six million people visit Grand Canyon in the US every year. For the purpose of helping project Grand Canyon for your fellow visitors and future generations, please follow the guidelines below.
Camping
To protect the park, camping is allowed only within permitted campgrounds. Permits are required for overnight camping at the North Rim. Advance booking can be received by mail. Please write: Information Center, P.O. Box 129, Grand Canyon, AZ 86023.
Fires
Because of the extreme fire danger, campfires are not allowed except at Mather and Desert View campgrounds. Collection of firewood is not allowed either.
Hiking(远足)
Please stay on permitted paths. Otherwise you may destroy desert plants. Pack out what you pack in, so you leave no signs of your visit. It is important to keep in mind that you are in a national park where wildlife exists.
Weather
The weather at Grand Canyon can change very quickly. With so much rock, lightning(闪电) causes a particular danger during sudden summer storms These storms also frequently bring floods inside valleys, a danger to hikers. Watch the skies and check daily weather reports.
Wildlife
Do not feed park wildlife. There have been a few cases at Grand Canyon National Park where deer(鹿) were purposely shot because there are plastic bags that left them sick and weak. Hungry deer car be danger and have kicked and bitten visitors at Grand Canyon. Some other animals will also beg and bite. For your own safety and the well-being of the animals, please do not feed wildlife, no matter how gentle they may appear.
1.What can you do first if you want to go camping?
A. Know the permitted paths B. Stop at Mather and Desert View
C. Make sure not to make a fire D. Book campgrounds in advance
2.What do the underlined words “pack out what you pack in” in Paragraph 4 probably mean?
A. keep everything out of campgrounds B. take away everything you bring in
C. carry all the necessary food D. look after your personal belongings
3.Why were some deer killed on purpose at Grand Canyon?
A. They begged food from visitors B. They were a danger to other gentle animals
C. They ate wrong things and become very ill D. They kicked and bit visitors
4.What is the main purpose of the text?
A. To provide travel information B. To report some recent news
C. To teach tourists hiking skills D. To introduce the wild life
高一英语阅读理解中等难度题查看答案及解析
阅读理解
Probably you have seen photographs of the Grand Canyon,the great valley in the desert country of Arizona.But you must go there yourself to feel its true size and beauty.The Grand Canyon is one of the greatest natural wonders of the world.
The Colorado River formed the Grand Canyon over millions of years.Slowly,the river cut down through hard rocks.At the same time,the land was rising.Today,the canyon is one and a half kilometers deep and 446 kilometers long.The oldest rocks at the bottom of the canyon are more than one billion years old.The width varies from about 200 meters to 29 kilometers across.The rim or top of the canyon is about 2,300 meters above sea level on the South Rim,and about 3,000 meters on the other side,the North Rim.As a result,there are different kinds of plants and animals on opposite sides of the canyon.The South Rim is a dry desert country.The North Rim has tall forests.
The canyon looks different at different times of a day,and in different seasons and weather.At sunrise and sunset the black,gold,brown,and orange colours of the rocks are especially clear and bright.In winter,the canyon is partly covered with snow.
The view from the South Rim of the Grand Canyon is the best.Most visitors come to the South Rim and stay in campgrounds or hotels.Every point along the canyon’s edge offers a different view.
The North Rim of the Canyon is quieter.It takes all day to drive there from the South Rim because there is only one bridge across the Colorado River.On the way,you go through Navajo Indian lands,and a colourful pink desert called “The Painted Desert”.
You can walk down into the Grand Canyon,or you can go down on the back of a mule.You can also take a boat trip down the Colorado River,and camp on the beaches at night.But whether you see the Grand Canyon from the top or the bottom,it will be an experience that you will never forget.
1.The best way to feel the size and beauty of the Grand Canyon is .
A.to see its photographs
B.to listen to the report about it
C.to travel there yourself
D.to watch the TV program about it
2.What made the Grand Canyon?
A.The earthquake.
B.The water from the Colorado River.
C.The American people.
D.The strong wind.
3.The sea level on both sides of the Grand Canyon is .
A.the same B.changing with time
C.different D.very low
4.From the passage we can know that the of the canyon is different at different times.
A.length B.scenery
C.width D.height
高一英语阅读理解中等难度题查看答案及解析
Five million people visit Grand Canyon in the US every year. For the purpose of helping protect Grand Canyon for your fellow visitors and future generations, please follow the guidelines below.
Camping
To protect the park, camping is allowed only within permitted campgrounds. Permits are required for overnight camping at the North Rim. Advance booking can be received by mail. Please write: Information Center, P.O. Box 129, Grand Canyon, AZ 86023
Fires
Because of the extreme fire danger, campfires are not allowed except at Mather and Desert View campgrounds. Collection of firewood is not allowed either.
Hiking
Please stay on permitted paths. Otherwise you may destroy desert plants. Pack out what you pack in, so you leave no signs of your visit. It is important to keep in mind that you are in a national park where wildlife exists.
Weather
The weather at Grand Canyon can change very quickly. With so much rock, lightning causes a particular danger during sudden summer storms. These storms also frequently bring floods inside valleys, a danger to hikers. Watch the skies and check daily weather reports.
Wildlife
Do not feed park wildlife. There have been a few cases at Grand Canyon National Park where deer were purposely shot because they ate plastic bags that left them sick and weak. Hungry deer can be a danger and have kicked and bitten visitors at Grand Canyon. Some other animals will also beg and bite. For your own safety and the well-being of the animals, please do not feed wildlife, no matter how gentle they may appear.
1. What can you do first if you want to go camping?
A. Book campgrounds in advance.
B. Know the permitted paths.
C. Make sure not to make a fire.
D. Stop at Mather and Desert View.
2. What do the underlined words “Pack out what you pack in” in Paragraph 4 probably mean?
A. keep everything out of campgrounds
B. look after your personal belongings
C. carry all the necessary food
D. take away everything you bring in
3. Why were some deer killed on purpose at Grand Canyon?
A. They begged food from visitors.
B. They were a danger to other gentle animals.
C. They ate wrong things and became very ill.
D. They kicked and bit visitors.
4. What is the main purpose of the text?
A. To report some recent news.
B. To provide travel information.
C. To teach tourists hiking skills.
D. To introduce the wildlife.
高一英语阅读理解简单题查看答案及解析
Five million people visit Grand Canyon in the US every year. For the purpose of helping project Grand Canyon for your fellow visitors and future generations, please follow the guidelines below.
Camping
To protect the park, camping is allowed only within permitted campgrounds. Permits are required for overnight camping at the North Rim. Advance booking can be received by mail. Please write: Information Center, P. O. Box 129, Grand Canyon, AZ 86023
Fires
Because of the extreme fire danger, campfires are not allowed except at Mather and Desert View campgrounds. Collection of firewood is not allowed either.
Hiking(远足)
Please stay on permitted paths. If you don’t do so, you may destroy desert plants. Pack out what you pack in, so you leave no signs of your visit. It is important to keep in mind that you are in a national park where wildlife exists.
Weather
The weather at Grand Canyon can change very quickly. With so much rock, lightning(闪电)causes a particular danger during sudden summer storms. These storms also frequently bring floods inside valleys, a danger to hikers. Watch the skies and check daily weather reports.
Wildlife
Do not feed park wildlife. There have been a few cases at Grand Canyon National Park where deer were purposely shot because they ate plastic bags that left them sick and weak. Hungry deer can be a danger and have kicked and bitten visitors at Grand Canyon. Some other animals will also beg and bite. For your own safety and the well-being of the animals, please do not feed wildlife, no matter how gentle they may appear.
1.What do the underlined words “pack out what you pack in” in Paragraph 4 probably mean?
A. keep everything out of campgrounds B. take away everything you bring in
C. carry all the necessary food D. look after your personal belongings
2.Why were some deer killed on purpose at Grand Canyon?
A. They ate wrong things and became very ill.
B. They were a danger to other gentle animals.
C. They begged food from visitors.
D. They kicked and bit visitors.
3.What is the main purpose of the text?
A. To provide travel information. B. To report some recent news.
C. To teach tourists hiking skills. D. To introduce the wildlife.
高一英语阅读理解中等难度题查看答案及解析
Five million people visit Grand Canyon in the US every year. For the purpose of helping project Grand Canyon for your fellow visitors and future generations, please follow the guidelines below.
Camping
To project the park, camping is allowed only within permitted campgrounds. Permits are required for overnight camping at the North Rim. Advance booking can be received by mail. Please write: Information Center, P.O. Box 129, Grand Canyon, AZ 86023
Fires
Because of the extreme fire danger, campfires are not allowed except at Mather and Desert View campgrounds. Collection of firewood is not allowed either.
Hiking
Please stay on permitted paths. Otherwise you may destroy desert plants. Pack out what you pack in, so you leave no signs of your visit. It is important to keep in mind that you are in a national park where wildlife exists.
Weather
The weather at Grand Canyon can change very quickly. With so much rock, lightning causes a particular danger during sudden summer storms. These storms also frequently bring floods inside valleys, a danger to hikers. Watch the skies and check daily weather reports.
Wildlife
Do not feed park wildlife. There have been a few cases at Grand Canyon National Park where deer were purposely shot because they ate plastic bags that left them sick and weak. Hungry deer can be danger and have kicked and bitten visitors at Grand Canyon. Some other animals will also beg and bite. For your own safety and the well-being of the animals, please do not feed wildlife, no matter how gentle they may appear.
1.What can you do first if you want to go camping?
A. Know the permitted. B. Book campgrounds in advance.
C. Make sure not to make a fire. D. Stop at Mather and Desert View.
2.What do the underlined words “pack out what you pack in” in Paragraph 4 probably mean?
A. Keep everything out of campgrounds. B. Take away everything you bring in.
C. Carry all the necessary food. D. Look after your personal belongings.
3.Why were some deer killed on purpose at Grand Canyon?
A. They ate wrong things and became very ill. B. They begged food from visitors.
C. They were a danger to other gentle animals. D. They kicked and bit visitors.
4.What is the main purpose of the text?
A. To provide travel information. B. To report some recent news.
C. To teach tourists hiking skills. D. To introduce the wild life.
高一英语阅读理解中等难度题查看答案及解析
Experience the newly opened Grand Canyon West Skywalk in Colorado.Departing from Grand Canyon’s South Rim by Airplane to Grand Canyon’s West Rim,you will land and take a ground tour to the Skywalk! Walk on air for 70 feet over the edge of Grand Canyon West.
This Skywalk has been open since March 28,2007.Daily visitor-ship to the Skywalk has been over 4000 people. Please be patient to enjoy your moment on the Skywalk.
After you have experienced the one and only Grand Canyon Skywalk Glass Bridge from where you can enjoy the scenery better,you will return to the Grand Canyon West airport and take your Airplane for a flight back to the South Rim of the Canyon.This is a tour never to be forgotten as you will have walked on air over the Grand Canyon.
Tour Itinerary
Tour Time | 5.7 Hours | The Grand Canyon Skywalk |
Flight from Grand Canyon South Rim to Grand Canyon West | 1 Hour | Experience a bird’s-eye view of the Grand Canyon as you make your way to Grand Canyon West. |
Light Lunch at Guano Point at Grand Canyon West | 2 Hour | You’ll be taken by bus to Guano Point with breathtaking views of the western part of the Grand Canyon where the Colorado River makes its way into Lake Mood.Every table for lunch has a view. |
Walk on the World-famous Skywalk | 1.5 Hour | Finally you’ll board your bus to Eagle Point,home of the Grand Canyon Skywalk.Now it is time for you to walk on air for 70 feet over the Grand Canyon. |
Flight Back to Grand Canyon South Rim | 1.2 Hour | After time on the Skywalk,you’ll return to the Grand Canyon West Airport and return to Grand Canyon South Rim in time for dinner and sunset. |
1.The purpose of the passage is to .
A. attract visitors to America
B. introduce the Skywalk to readers
C. describe the beauty of Grand Canyon
D. speak highly of Grand Canyon South Rim
2.Why is the bridge in the passage made of glass?
A. Because it can differ from others.
B. Because it is cheaper.
C. Because it gives visitors a better view.
D. Because it looks more wonderful.
3.According to the Tour Itinerary,the route is .
A. South Rim →Guano Point →West Airport →Eagle Point →West Airport →South Rim
B. South Rim →West Airport →Guano Point →Eagle Point →West Airport →South Rim
C. South Rim →West Airport →Eagle Point →Guano Point →West Airport →South Rim
D. South Rim →West Airport →Eagle Point →West Airport →Guano Point →South Rim
4.How does the author find the tour over the Grand Canyon?
A. Boring. B. Expensive.
C. Impressive. D. Adventurous.
高一英语阅读理解中等难度题查看答案及解析
The Haskell Free Library and Opera House might not be as well known as the Grand Canyon or the Statue of Liberty. 1.. Completed in 1904, the building is stationed directly between Stanstead, Quebec, and Derby Line, Vermont. with the official US -Canada borderline running right across the library's floor.
Martha Stewart Haskell and her son, Colonel Horace Stewart Haskell, both Canadians, built the building as a tribute(悼念) to Mrs Haskell's late husband, Carlos.2..
While the library’s official entrance is on the US side of the building, most of the books are on the Canadian side.3.. The Opera House is similarly split, with most of its seats in the US and its stage in Canada. As Atlas Obscura reported, it is often said that the Haskell is the only library in the US with no books, and the only opera house in the country with no stage.
Passports and other forms of identification aren’t required to cross from country to country in the library, though the Haskell's website notes that the border inside the building“ is real and it is enforced”. 4.. If they don't, they risk possible detention and fines.
Even beyond the building's unique position,library director Nancy Rumery told CTV News that Haskell staffers-Canadian and American alike-consider the institution to be like any other library in the world
“We’re just trying to be the best library we can.5..” she said. “These are all our neighbors and we do our very best to help them on their life-long learning journey. ”
A.The Haskell is full of mysterious places.
B.The Haskell is divided between the two countries.
C.Visitors have access to a variety of cultural resources.
D.Visitors are expected to their side of the border after a visit.
E.It’s undoubtedly one of America's most unique tourist attractions.
F.Our community is made up of people from two different countries
G.The family hoped that citizens would use it as a “center for learning and cultural enrichment”
高一英语七选五中等难度题查看答案及解析