Probably you have seen photos 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 gr 题目和参考答案——青夏教育精英家教网—

题目内容

Probably you have seen photos of the Grand Canyon（峡谷）, 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 rock. At the same time, the land was rising. Today the canyon is 1.5 kilometers and 445 kilometers long. The oldest rocks at the bottom of the canyon are more than 1 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. As a result, there are different kinds of plants and animals on opposite sides of the canyon. The South Rim is dry desert country. The North Rim has tall forests.

The canyon looks different at different times of day, and in different seasons and weather. At sunrise and sunset the red, gold, brown and orange colors 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 here 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 Navado Indian lands, and a colorful pink desert called “The Painted Desert”.

1.The best way to feel the true beauty of the Grand Canyon is to________.

A．see its photographs	B．listen to the report about it
C．watch its introduction on TV	D．go there yourself and visit it

2. The scene of the canyon is ________.

A．various depending on different time and places

B．almost the same

C．various depending on different time

D．various depending on different places

3. If you want to visit the North Rim from the South Rim, you________.

A．can go there in many direction	B．won’t spend much time on the way
C．can visit The Painted Desert on the way	D．needn’t go across any bridges

4. If you want to have a visit to the Grand Canyon, you’d better go to _______.

A．the North Rim

B．the South Rim

C．the bottom

D．Navado Indian Lands

【答案】

1.D2.A3.C4.B

【解析】略

练习册系列答案

赢在寒假期末闯关合肥工业大学出版社系列答案

快乐寒假山西教育出版社系列答案

创优教学中考必备中考试题精选系列答案

开心快乐假期作业寒假作业西安出版社系列答案

名题教辅寒假作业快乐衔接武汉出版社系列答案

相关题目

Do you know how it is when you see someone yawn and you start yawning too? Or how hard it is to be among people laughing and not laugh yourself? Well, apparently it's because we have mirror neurons (神经元）in our brains.
Put simply, the existence of mirror neurons suggests that every time we see someone else do something, our brains imitate (模仿)it，whether or not we actually perform the same action. This explains a great deal about how we learn to smile, talk, walk, dance or play sports. But the idea goes further： mirror neurons not only appear to explain physical actions _y they also tell us that there is a biological basis for the way we understand other people.
Mirror neurons can undoubtedly be found all over our brains, but especially in the areas which relate to our ability to use languages, and to understand how other people feel. Researchers have found that mirror neurons relate strongly to language. A group of researchers discovered that if they gave people sentences to listen to ( for example ："The hand took hold of the ball" ) , the same mirror neurons were triggered as when the action was actually performed (in this example, actually taking hold of a ball).
Any problems with mirror neurons may well result in problems with behavior. Much researeh suggests that people with social and behavioral problems have mirror neurons which are not fully functioning. However, it is not yet known exactly how these discoveries might help find treatments for social disorders.
Research into mirror neurons seems to provide us with ever more information concerning how humans behave and interact(互动）.Indeed, it may turn out to be the equivalent (相等物）for ncurosciencc of what Einstein's theory of relativity was for physics. And the next time you feel the urge to cough in the cinema when someone else does--well，perhaps you'll understand why.
【小题1】Mirror neurons can explain .

A．why we cry when we are hurt

B．why we cough when we suffer from a cold

C．why we smile when we see someone else smile

D．why we yawn when we see someone else stay up late

【小题2】The underlined word "triggered" in the third paragraph probably means “ ”

【小题3】We can learn from the passage that mirror neurons .

A．relate to human behavior and interaction

B．control human physical actions and feelings

C．result in bad behavior and social disorders

D．determine our knowledge and language abilities

【小题4】What is the passage mainly about?

A．Ways to find mirror neurons.

B．Problems of mirror neurons.

C．Existence of mirror neurons.

D．Functions of mirror neurons.

Three—quarters of a million tourists flock to the white beaches every year，but this booming industry has come at a price．Poisonous smoke rising from open fires，rubbish made up of plastic bottles，packets…it’S a far cry from the white sands，clear waters and palm trees that we associate with the Maldives(马尔代夫)，the paradise island holiday destination set in the Indian Ocean．
of its 200 inhabited islands，which are spread across an area of"35，000 square miles，99 are good resorts(旅游胜地)．So many tourists come every year，more than double the local population．Of these，over l 00，000 travel from the U K．The capital，Mal6，is four times more densely populated than London．Given these facts，it’S hardly surprising that the Maldives has a waste disposal problem．
Y ears a90，when the tourists left，the government had to deal with a stream of rubbish．Their solution was to turn one of the islands into a dumping ground．Four miles west of Mal6 is the country’s dumping ground，Thilafushi．What you are seeing here is a view of the Maldives on which no honeymooners will ever clap eyes．Each visitor produces 3．5 kg of waste per day．The country dumps more than 330 tons of rubbish on the island every day．
Now，since many waste boats，fed up with waiting seven hours or more，directly offload their goods into the sea，the government of the Maldives has banned the dumping of waste on the island．S0，the waste boats ship the rubbish to India instead．
【小题1】What is the main cause of the waste disposal problem?

A．The big local population．	B．Too many waste boats．
C．The large number of tourists．	D．Open fires on the islands．

【小题2】The underlined part can probably be replaced by“——”．

A．it’s quite similar to	B．it’S a long distance from
C．it’s a loud shout from	D．it’S totally different from

【小题3】What can we learn from the text?

A．It iS much more crowded in Mal6 than in London．

B．Another island will be used as a dumping ground．

C．No honeymooners are willing to visit the Maldives．

D．Waste on islands will be offloaded directly into the sea．

【小题4】What’S the author’S purpose in writing the text?

A．To attract more tourists to the Maldives．

B．To state the waste disposal problem in the Maldives．

C．To call on us to protect the environment．

D．To explain the causes of pollution in the Maldives．

A few months ago as I wandered through my parents’ house, the same house I grew up in, I had a sudden, scary realization. When my parents bought the house, in 1982, they were only two years older than I am now. I tried to imagine myself in two years, ready to settle down and buy the house I’d still be living in almost 30 years later.

??? It seemed ridiculous. On a practical level, there’s no way I could afford to buy a house anytime soon. More importantly, I wouldn’t want to. I’m not sure where I’ll be living in two years, or what kind of job I’ll have. And I don’t think I’ll be ready to settle down and stay in one place.

??? So this is probably the generation gap that divides my friends and me from our parents. When our parents were our age, they’d gotten their education, chosen a career, and were starting to settle into responsible adult lives.

??? My friends and I – “Generation Y” – still aren’t sure what we want to do with our lives. Whatever we end up doing, we want to make sure we’re happy doing it. We’d rather take risks first, try out different jobs, and move from one city to another until we find our favorite place. We’d rather spend our money on travel than put it in a savings account.

??? This casual attitude towards responsibility has caused some critics to call my generation “arrogant”, “impatient”, and “overprotected”. Some of these complaints have a point. As children we were encouraged to succeed in school, but also to have fun. We grew up in a world full of technological innovation: cellphones, the Internet, instant messaging, and video games.

??? Our parents looked to rise vertically（垂直的）– starting at the bottom of the ladder and slowly making their way to the top, on the same track, often for the same company. That doesn’t apply to my generation.

??? Because of that, it may take us longer than our parents to arrive at responsible, stable adulthood. But that’s not necessarily a bad thing. In our desire to find satisfaction, we will work harder, struggle for ways to keep life interesting, and gain a broader set of experiences and knowledge than our parents’ generation did.??????????????????????????????????????????????????????????????????????????????

1.What is the main “generation gap” between the author and her friends and their parents according to the article?

A. Their ways of gaining experience.

B. Their attitude towards responsibility.
C. Their attitude toward high technology.
D. Their ways of making their way to the top.

2.Which of the following might the author agree with?

A. It involves too much effort to rise vertically.
B. It’s better to take adult responsibility earlier.
C. It’s all right to try more before settling down.
D. It’s ridiculous to call her generation “arrogant”.

3. What can we conclude from the article?

A. The author is envious of her parents enjoying a big house at her age.

B. “Generation Y” people don’t want to grow up and rush into adulthood.

C. Growing up in a hi-tech world makes “Generation Y” feel insecure about relationships.

D. The author wrote this article so that others would be able to understand her generation better.

4.What is the main theme of the article?
A. Criticisms of the young generation.
B. The sudden realization of growing up.
C. A comparison between lifestyles of generations.
D. The factors that have changed the young generation.

Researchers at Sweden’s KTH Royal Institute of Technology say they have found further proof that the wolf ancestors of today’s dogs can be from southern East Asia -- findings that are contrary to theories placing the birth place in the Middle East. Dr Peter Savolainen, KTH researcher in evolutionary genetics, says a new study released Nov. 23 confirms that an Asian region south of the Yangtze River was the principal and probably the only region where wolves were domesticated（驯化）by humans.

Research data show clearly that dogs are descended from wolves, but there’s never been scientific agreement on where in the world the domestication process began. “Our analysis of Y-chromosomal（染色体）DNA now confirms that wolves were first domesticated in Asia south of Yangtze River -- we call it the ASY region -- in southern China or Southeast Asia,” Savolainen says.

The Y data supports previous evidence from mitochondrial（线粒体）DNA. “Taken together, the two studies provide very strong evidence that dogs appeared first in the ASY region,” Savolainen says.

Archaeological data and a genetic study recently published in Nature suggest that dogs originate from the Middle East. But Savolainen rejects that view. “Because none of these studies included samples from the ASY region, evidence from ASY has been overlooked,” he says.

Peter Savolainen and PhD student Mattias Oskarsson worked with Chinese colleagues to analyse DNA from male dogs around the world. Their study was published in the scientific journal Heredity.

Approximately half of the gene pool was universally shared everywhere in the world, while only the ASY region had the entire range of genetic diversity. “This shows that gene pools in all other regions of the world most probably originate from the ASY region,” Savolainen says.

“Our results confirm that Asia south of the Yangtze River was the most important -- and probably the only -- region for wolf domestication, and that a large number of wolves were domesticated,” says Savolainen.

In separate research published recently in Ecology and Evolution, Savolainen, PhD student Arman Ardalan and Iranian and Turkish scientists conducted a comprehensive study of mitochondrial DNA, with a particular focus on the Middle East. Because mitochondrial DNA is inherited only from the mother in most species, it is especially useful in studying evolutionary relationships.

“Since other studies have indicated that wolves were domesticated in the Middle East, we wanted to be sure nothing had been missed. We find no signs whatsoever that dogs originated there,” says Savolainen.

In their studies, the researchers also found minor genetic contributions from crossbreeding between dogs and wolves in other geographic regions, including the Middle East.

“This subsequent dog/wolf hybridisation（混合淡化技术）contributed only modestly to the dog gene pool,” Savolainen explains.

1.What does Dr. Peter Savolainen believe?

A. Dogs’ ancestors came from the Middle East.

B. Wolves were probably first trained to work for humans in the ASY region.

C. Analysis of Y-chromosomal DNA should be combined with mitochondrial DNA.

D. Samples of the previous studies are enough to support the conclusion.

2.We can learn from the passage that _______.

A．there is a universal agreement on the place of first domestication

B．data from ASY may highlight where dogs came from

C．Dr. Savolainen’s research mainly focuses on the Middle East

D．the dog/wolf hybridization makes up most of the dog gene pool

3.What is special about mitochondrial DNA?

A．It is only used in studying evolutionary relationships.

B．It alone can provide hard evidence for Savolainen’s research.

C．It is the most useful in finding out the birth place of dogs.

D．It comes from the mother of most animals and plants.

It seemed ridiculous. On a practical level, there’s no way I could afford to buy a house anytime soon. More importantly, I wouldn’t want to. I’m not sure where I’ll be living in two years, or what kind of job I’ll have. And I don’t think I’ll be ready to settle down and stay in one place.

So this is probably the generation gap that divides my friends and me from our parents. When our parents were our age, they’d gotten their education, chosen a career, and were starting to settle into responsible adult lives.

My friends and I – “Generation Y” – still aren’t sure what we want to do with our lives. Whatever we end up doing, we want to make sure we’re happy doing it. We’d rather take risks first, try out different jobs, and move from one city to another until we find our favorite place. We’d rather spend our money on travel than put it in a savings account.

This casual attitude toward responsibility has caused some critics to call my generation “arrogant”, “impatient”, and “overprotected”. Some of these complaints have a point. As children we were encouraged to succeed in school, but also to have fun. We grew up in a world full of technological innovation: cellphones, the Internet, instant messaging, and video games.

Our parents looked to rise vertically(垂直的)--starting at the bottom of the ladder and slowly making their way to the top, on the same track, often for the same company. That doesn’t apply to my generation.

Because of that, it may take us longer than our parents to arrive at responsible, stable adulthood. But that’s not necessarily a bad thing. In our desire to find satisfaction, we will work harder, strive for ways to keep life interesting, and gain a broader set of experiences and knowledge than our parents’ generation did.

By Ariel Lewiton

1.When the author walked through her parents’ house, she _______.

A．was frightened that she had no idea what she wanted from life

B．started to think about her own life

C．realized I should buy a house.

D．wondered why her parents had settled down early

2.What is the main “generation gap” between the author and her friends and their parents according to the article?

A．Their attitude toward high technology.

B．Their ways of making their way to the top.

C．Their attitude towards responsibility.

D．Their ways of gaining experience.

3.Which of the following might the author agree with?

A．It’s all right to try more before settling down.

B．It’s better to take adult responsibility earlier.

C．It involves too much effort to rise vertically.

D．It’s ridiculous to call her generation “arrogant”.

4.What can we conclude from the article?

A．The author is envious of her parents enjoying a big house at her age.

B．Growing up in a hi-tech world makes “Generation Y” feel insecure about relationships.

C．“Generation Y” people don’t want to grow up and love to be taken care of by their parents.

D．The author wrote this article so that others would be able to understand her generation better.

5.What is the main theme of the article?

A．The sudden realization of growing up.

B．A comparison between lifestyles of generations.

C．Criticisms of the young generation.

D．The factors that have changed the young generation.

试题分类