Wheels are everywhere around you and me, 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, roads with smooth surfaces weren't going to be constructed until there was plenty of demand for them. Eventually, 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 modern road design.

In the mid-1700s,a Frenchman came up with a new design of road--a base layer (层)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 time, metal hubs(the central part of a wheel)came into being, followed by the pneumatic tire (充气轮胎) in 1846. Alloy wheels were invented in 1967, sixty years after the appearance of tarmacked roads(柏油路). As wheel design took off, vehicles go faster and faster.

1.What might be the reason why transport wheels wasn’t that popular for some time?

A. Few knew how to use transport wheels.

B. Humans carried farming tools just as well.

C. Such animals as horses and bulls were still a good means of transport.

D. The existence of transport wheels was not known.

2.How is the last paragraph mainly developed?

A. By giving examples.

B. By following time order

C. By making comparisons.

D. By making classifications.

3.What is the passage mainly about?

A. The beginning of road design.

B. The history of public transport.

C. The developmentt of transport wheels.

D. The invention of fast-moving vehicles.

When Charles Stratton was five, he stopped growing. His mother took him to see the famous showman, P. T. Barnum. Mr. Barnum thought a small person would be the perfect addition to his show. He hired Charles' parents along with him, and they traveled the world together.

He gave the two-foot-tall Charles a name, General Tom Thumb. He taught Tom how to sing, dance, act and tell jokes. When he felt Tom was ready to perform on stage, he made up ads. To stir up great interest, he said that Tom was eleven years old and had come from England.

During the show, Tom fought battles pretendedly with tall people. He also danced upon a wooden plate held by a person who was eight feet tall. Tom's act was very popular and brought in a lot of money. By the time Tom was an adult, he had grown very rich. He had become a billionaire at the age of twenty five.

Fortunately for Tom, Mr. Barnum added more little people to his show, and Tom became lucky in love as well. One of the little people was Lavinia Warren, a schoolteacher. Tom was able to win her love, and they married.

The ceremony and reception were the talk of the town. They were attended by many rich and famous people and by about 2000 guests. Crowds filled the streets of New York to have a look at their tiny wedding marriage. The couple even met with President Abraham Lincoln on their honeymoon just before going to live in Tom's house in Connecticut.

Their wedding, which took place during the Civil War, provided a welcome escape from the sad problems of war. Not willing to let this bit of sunshine fade, communities throughout the country sponsored "Tom Thumb" weddings. In these weddings, small boys and girls, all dressed up, went through marriage ceremony for fun.

1.The underlined words "talk of the town" means________.

A. it was in the newspaper

B. it was the most popular topic

C. people spread bad rumors about it

D. it was discussed in a city meeting

2.What does the author think about Tom's wedding?

A. Tom and Lavinia were stupid.

B. People gave it too much of their attention.

C. It was funny and ridiculous.

D. It helped people cheer up in a dark time.

3.What is the main idea of the last paragraph?

A. Weddings always make people feel full of sunshine.

B. People are always disappointed during war time.

C. Entertainment can serve an important purpose.

D. People should be married when they are small children.

Money matters, no matter who or where you are. So when China’s currency the yuan was devalued (贬值) against the US dollar for three straight days in mid-August, the world felt the effects. As CNN put it: “If China sneezes, the world catches a cold.”

Why does it matter so much?

The exchange rate is the term for the comparison of two currencies. It says how much one currency is worth in terms of (换算) the other.

“Exchange rates play an important role in a country’s level of trade. It is one of the most important determinants (决定因素) of a country’s relative level of economic health,” wrote Jason Van Bergen of Forbes.com. A higher currency makes a country’s exports more expensive and imports cheaper, and vice versa (反之亦然).

Devaluation means the same amount of RMB can be exchanged for fewer USD. For example, on Aug 11, the exchange rate of RMB to USD was 6.23, which meant $1 was worth the same as 6.23 yuan. Two days later, the rate changed to 6.4, meaning the value of RMB had dropped by 2.7 percent.

So what does a weaker currency mean for our lives?

It first affects those who want to travel to, or study in, the US. If your former classmate is leaving for a preparatory (预科) school in the US at the end of August, it now costs about 1,800 yuan more to exchange currency for 10,000 US dollars than it did earlier this month. However, since many currencies have decreased in value, the value of yuan is still relatively high despite the recent devaluation. This means it costs 1,200 yuan less to get 10,000 Canadian dollars now than it did in March.

Even if we don’t have plans to travel abroad, though, we could still be affected. For example, your mother will have to pay more if she buys directly from overseas websites with US dollars. And chances are that imported chocolate and potato chips will soon be a bit more expensive in your local supermarket.

However, the weaker yuan is good news for Chinese exporters. It makes Chinese exports less expensive and it could boost the overseas sales that have been among the main reasons for China’s economic growth during its rise over the past 30 years.

Just as Erik Britton of Fathom, a London-based economic consulting firm, told The Guardian: “We’re all going to feel it: we’ll feel it through commodities (商品), not just from China but from everywhere that has to compete with it; and we’ll feel it through wages.”

“The devalued yuan will force China’s Asian rivals (竞争对手), such as Indonesia and South Korea, to compete even harder,” wrote Heather Stewart, economics editor of The Guardian. “The result may be cheaper Christmas presents.”

1.According to the passage, it can be learned from the passage EXCEPT___________

A. The higher China’s currency is , the less expensive potato chips from America become.

B. In March people spent 1,200 yuan more to get 10,000 Canadian dollars than they do today because Canadian dollars increased in value.

C. China’s currency’s devaluation against the US dollar in mid-August makes students studying in America pay more school fees.

D. People who work in Fathom will be greatly affected on account of the weaker yuan.

2.The passage implies that ___________.

A. The yuan’s devaluation contributes a lot to China’s economic growth .

B.Exchange rates are the most important factor determining a country’s relative level of economic health

C. The yuan’s devaluation has a great impact on all the countries in the world.

D.Chinese exports sell well overseas because of their high quality

3.If the exchange rate of RMB to USD increased from 6.5 to 6.7, how much more percent would you pay when you bought a bag worth $100?

A. 2.7 B. 5.4 C.20.0 D. 3.1

See a cellphone cover that you like on Taobao? Forget about placing an order, paying the bill online and waiting for days for it to be delivered to you. In the near future, you'll be able to get it in minutes just by hitting “print” on your computer.
You might find it hard to believe that you could actually “print” an object like you would a picture. But it is not that hard to understand how it would work. Just as a traditional printer sprays ink onto paper line by line, modern 3D printers spread material onto a surface layer by layer, from the bottom to the top, gradually building up a shape.
Instead of ink, the materials the 3D printer uses are mainly plastic, resin(树脂) and certain metals. The thinner each layer is—from a millimetre to less than the width of a hair—the smoother and finer the object will be.
This may sound like a completely new technology, but the truth is that 3D printing has been around since the late 1980s. Back then, it was barely affordable for most people, so few knew about it.
Last year, though, saw a big change in the 3D printing industry—printers became much cheaper. For example, 10 years ago a desktop 3D printer might have cost £20,000, while now they cost only about £1,000, according to the BBC.
Taken out of the factory and introduced to more diverse and common uses, 3D printing can create just about anything you can think of—flutes , bikinis, jewelry, aircraft parts and even human organs. In fact, scientists from Cornell University in New York have just made an artificial ear using a 3D printer, according to Science Daily. The fake ear looks and acts exactly like a natural one.
However, as 3D printing becomes more common, it may bring about certain problems—such as piracy. “Once you can download a coffee maker, or print out a new set of kitchen utensils (餐具) on your personal 3D printer, who will visit a retail store again?” an expert in 3D printing told Forbes News. Even more frightening, what if anyone in the world could use a 3D printer to print out a fully functioning gun?

1.According to the article, in the future, the 3D printing technology will _______.
A. enable people to make better purchases online

B. change the way we make many products
C. be applied as widely in our daily life as computers
D. shorten the time it takes for people to get what they buy online

2.What happened in the 3D printing industry last year?
A. The 3D printing technology was taken out of the factory.
B. The 3D printing technology began to be used in various fields.
C. The 3D printer was used for medical treatment for the first time.
D. The 3D printer became more affordable for consumers.

3.What is the best title of the passage?
A. Great Demand for 3D Printers B. Technology in the Future
C. Online Shopping Disappearing D. Printing out Everything

4.How is the last paragraph developed?
A. By giving examples.

B. By making comparisons.
C. By analyzing the cause and effect.

D. By presenting research findings.

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