Almost every machine with moving parts has wheels, yet no one knows exactly when the first wheel was invented or what it was used for. We do know, however, that they existed over 5,500 years ago in ancient Asia.

The oldest known transport wheel was discovered in 2002 in Slovenia. It is over 5,100 years old. Evidence suggests that wheels for transport didn't become popular for a while, though. This could be because animals did a perfectly good job of carrying farming tools and humans around.

But it could also be because of a difficult situation. While wheels need to roll on smooth surfaces（光滑表面）, roads with smooth surfaces weren't going to be built until there was plenty of demand for them. Finally, road surfaces did become smoother, but this difficult situation appeared again a few centuries later. There had been no important changes in wheel and vehicle design before the arrival of moden road design.

In the mid-1700s, a Frenchman came up with a new design of road—a base layer (層) of large stones covered with a thin layer of smaller stones. A Scotsman improved on this design in the 1820s and a strong, lasting road surface became a reality. At around the same lime, metal hubs (the central part of a wheel) came into being, followed by the pneumatic tyre(充氣輪胎) in 1846. Alloy(合金) wheels were invented in 1967, sixty years after the appearance of tarmacked roads (柏油路). As wheel design took off, vehicles got faster and faster.

1. What might explain why transport wheels didn't become popular for some time?

A. Few knew how to use transport wheels.

B. Humans carried farming tools just as well.

C. Animals were a good means of transport.

D. The existence（存在）of transport wheels was not known.

2.How is the last paragraph mainly developed?

A. By giving examples.

B. By making comparisons.

C. By giving discussion

D. By making classifications.(分類)

3.What is the passage mainly about?

A. The beginning of road design.

B. The development of transport wheels.

C. The history of public transport.

D. His invention of fast-moving vehicles.

練習冊系列答案
相關(guān)習題

科目：高中英語 來源：2016屆黑龍江哈爾濱六中高三下期開學考試英語試卷（解析版） 題型：短文改錯

短文改錯

假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文。文中共有10處語言錯誤，每句中最多有兩處。錯誤涉及一個單詞的增加、刪除或修改。

增加：在缺詞處加一個漏字符號（∧），并在其下面寫出該加的詞。

刪除：把多余的詞用斜線（\）劃掉。

修改：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞。

注意：1. 每處錯誤及其修改僅限一詞。

2. 只允許修改10處，多者（從第11處起）不計分。

Dear Cathy,

I am writing to share my opinion on fashion with you, for I had just heard that you are disappointing because you can’t afford famous brands.

I shall say that it is naturally for people to care about his appearance. And it is true that fashionable thing like clothes and shoes will make one more eye-catching. Therefore, I think it is really a waste of money for you to buy famous brands. Besides, it will also add the burden of your parents.

What’s more, beauty is only skin-deep. There are many things in which can make you popular beside fashion. A great amount of knowledge and a warm heart will surely win others’ respect.

As the saying goes, never judge the person by his appearance. I do hope that you will remember the saying and be as happy as you used to be.

Yours,

Jane

查看答案和解析>>

科目：高中英語 來源：2015-2016學年江蘇揚州中學高一下期3月考英語試卷（解析版） 題型：書面表達

書面表達

閱讀下面微博上的短文, 然后按要求寫一篇150個詞左右的英語短文。

Hi, everyone. I am Jane. I have a problem and don’t know what to do. So I need your help!

This morning I was ready to review my lessons with my computer in my dormitory, and then Mary, my roommate and best friend, came back with a laptop. She wanted to use my connector, and I did as she asked.

After a while, she took away my headset and opened her laptop. Afterwards she connected to the Internet with my connector. Then something unexpected happened. She used the audio player with the loudspeaker. She entered her QQ Zone and started using the video system to chat with my microphone. Sounds of music, QQ and their talking became louder and louder. She completely ignored that I was there reviewing my lessons.

I could not bear that, so I asked her to be quiet a little, but I failed. At last I had to go away to the classroom. On the way I became angrier and angrier because she was using my things, but never thought about my feeling. She drove me out. I am very sad. Am I her friend? Should I stop our friendship?

[寫作內(nèi)容]

1. 以約30個詞概括上文的主要內(nèi)容。

2. 以約120個詞發(fā)表你的看法, 內(nèi)容包括:

(1)你對Mary的行為的看法, 并說明理由;

(2)假如你是Jane, 你會如何處理這件事;

(3)以你的經(jīng)歷談?wù)勀愫团笥严嗵幍捏w會。

[寫作要求]

1. 作文中可使用自己的親身經(jīng)歷或虛構(gòu)的故事, 也可以參照閱讀材料的內(nèi)容但不得直接引用原文中的句子;

2. 文中不能出現(xiàn)真實姓名和學校名稱。

[評分標準]

句子結(jié)構(gòu)準確, 信息內(nèi)容完整, 篇章結(jié)構(gòu)連貫。

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

查看答案和解析>>

科目：高中英語 來源：2015-2016學年江蘇揚州中學高一下期3月考英語試卷（解析版） 題型：單項填空

Some school teachers complained, “Many kids haven’t got any hobbies ________ you call playing computer games a hobby. ”

A. unless B. once C. since D. if

查看答案和解析>>

科目：高中英語 來源：2015-2016學年黑龍江大慶鐵人中學高一3月考英語試卷（解析版） 題型：短文改錯

改錯

Time fly like an arrow. I’m already in Senior Grade 3 before I realized it. It will be only a little more than eight months before I graduate middle school. At the present, I’m busy review my lessons in order to take the College Entrance Examination. I hope to go to Beijing University, that is one of the best university not only in China but also in the world. I’ll try my best to turn your dream into reality. Most of my classmates are also studying very hardly to realize their dreams. I do believe everyone will be able to enter an university or college.

查看答案和解析>>

科目：高中英語 來源：2015-2016學年貴州思南中學高二下期第一次月考英語試卷（解析版） 題型：短文改錯

短文改錯

As we all know , walking is an useful way of exercising and is beneficial to our health. It can not only reduce the risk of many kinds of diseases but also builds up the bones. It’s safe than many other ways of exercising, especially for the elderly and it’s easy to do without consider rules. Beside, walking can also help us lose weight.

What should we pay attention during the walk? First, we should wear loose clothes or good shoes so that we can relax. Second, we should walk fast enough to cause us to breath with difficulty but still be able to talk. Third, that is very important to walk with our arms moving freely. Most important, we should do it every day.

查看答案和解析>>

科目：高中英語 來源：2015-2016學年貴州思南中學高二下期第一次月考英語試卷（解析版） 題型：閱讀理解

At the age of 16, Julia Butterfly Hill quit school and worked at a restaurant. For many years, she was only interested in making money and material things. Then one day she had a serious car accident, which changed her life. Hill said: “I realized I wanted to find a more powerful purpose for being here on this planet.”

As soon as she recovered, Hill traveled to California. There she saw ancient redwood trees, which are the largest trees in the whole world. The wood from redwood trunks is very hard. So the Pacific Lumber Company cut down many of the huge redwoods to use for construction. There are not many forests of these trees left. Many environmental activists want to protect the remaining trees. The redwoods are very important to the environment.

In 1997 Hill learned a group called Earth First was working to protect a particular group of trees. They decided to send someone up into a redwood tree, hoping this would stop the company from cutting the trees down. Julia Butterfly Hill volunteered.

Hill lived in the tree for over two years without ever coming down. Her home was a 6-by-8-foot tree house, 180 feet up. It is always cold and wet in a redwood tree. There were even very serious winter storms while Hill was in the tree. The wind and cold almost knocked Hill out of the tree. But she did not fall — she survived.

Finally, after years of arguing, the company decided to protect Luna, the tree Hill lived in. They signed an agreement to never cut down this huge redwood tree or the trees around it. When Hill put her feet on the earth again, she began to cry. But from that moment on Hill hasn’t stopped working to protect the environment.

1.Julia Butterfly Hill traveled to California _____.

A. to find a new job

B. to build a tree house

C. with the hope of joining Earth First

D. in expectation of doing something meaningful

2.The redwood trees were cut down mainly _____.

A. because they might fall over at any time

B. because they had great economic value

C. to protect other trees in the forest

D. to make space for constructions

3.Julia Butterfly Hill’s living conditions in the tree were _____.

A. comfortable B. cool C. tough D. satisfying

4.What can we learn about Julia Butterfly Hill from the text?

A. She has a sense of social responsibility.

B. She failed to protect the redwood tree.

C. She built a new house in the forest.

D. She is a self-centered woman

查看答案和解析>>

科目：高中英語 來源：2016屆甘肅嘉峪關(guān)市高三第六次模擬考試英語試卷（解析版） 題型：閱讀理解

Walk through the Amazon rainforest today and you will find it steamy, warm, damp and thick. But if you had been there around 15,000 years ago, during the last ice age, would it have been the same? For more than 30 years, scientists have been arguing about how rainforests might have reacted to the cold, dry climate of the ice ages, but till now, no one has reached a satisfying answer.

Rainforests like the Amazon are important for mopping up CO2 from the atmosphere and helping to solve global warming. Currently the trees in the Amazon take in around 500 million tons of CO2 each year: equal to the total amount of CO2 given off in the UK each year. But how will the Amazon react to the future climate change? If it gets drier, will it survive and continue to draw down CO2? Scientists hope that they will be able to learn in advance how the rainforest will manage in the future by understanding how rainforests reacted to climate change in the past.

Unfortunately, collecting information is incredibly difficult. To study the past climate, scientists need to look at fossilized pollen（花粉）kept in lake mud, Going back to the last ice age means drilling down into lake sediments（沉淀物）, which requires specialized equipment and heavy machinery. There are very few roads and paths, or places to land helicopters and aeroplanes. Rivers tend to be the easiest way to enter the forest, but this still leaves vast areas between the rivers completely unsampled（未取樣）. So far, only a handful of cores have been drilled that go back to the last ice age and none of them provide enough information to prove how the Amazon forest reacts to climate change.

1.How do scientists study the past climate change?

A. By predicting the climate change in the future.

B. By drilling down deep into land sediments.

C. By analyzing fossilized pollen in lake mud.

D. By taking samples from rivers in the Amazon.

2.Why is it difficult to collect information about the past climate change?

A. Because scientists can't find proper equipment and machinery.

B. Because it is very difficult to obtain complete samples.

C. Because helicopters and aeroplanes have no place to land.

D. Because none of the cores provide any information.

3.Where is the passage most probably taken from?

A. A medical journal. B. A news report

C. A travel brochure. D. A science magazine.

4.The best title for the text may be .

A. Secrets of the Rainforest

B. Climates of the Amazon

C. The History of the Rainforest

D. Changes of the Rainforest

查看答案和解析>>

科目：高中英語 來源：2015-2016學年山東淄博高青縣一中高二4月月考英語試卷（解析版） 題型：語法填空

閱讀下面材料，在空白處填入適當?shù)膬?nèi)容（不多于3個單詞）或括號內(nèi)單詞的正確形式。

There is 1. old Spanish Proverb which states, “Tomorrow is often the 2. (busy) day of the week”. How many 3. (time) have we put off our dreams until tomorrow? I’d say, too many. Our dreams should not, and cannot wait. We have to go for them now! Here are the reasons.

Tomorrow is not promised. Nobody likes to talk about 4. (dead), but the reality is—— 5. is going to die at one point. None of us know the day, or the hour. Therefore, today is all we have. Don’t go to your grave 6. unfulfilled dreams. Make the decision to go after every dream, big or small right now.

You’ll be much 7. (happy) if you go for it. Imagine how much happier you’ll be 8. you’re living the life you always dreamed about. The only thing 9. is stopping you is yourself. Take control of your own happiness. Don’t keep your dreams 10. (wait). Go after them today!

查看答案和解析>>

同步練習冊答案