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SEE a cell phone 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 (喷) ink onto paper line by line, modern 3-D 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 3-D printer uses are mainly plastic, resin (树脂)and certain metals. The thinner each layer is --- from a millimeter 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 3-D 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 3-D printing industry--- printers became much cheaper. For example, 10 years ago a desktop 3-D printer might have cost £20,000 (200,000 yuan), 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, 3-D printing can create just about anything you can think of ---flutes (笛子), 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 3-D printer, according to Science Daily. The fake ear looks and acts exactly like a natural one.
However, as 3-D printing becomes more commonplace, 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 3-D printer, who will visit a retail (零售的) store again?" an expert in 3-D printing told Forbes News. Even more frightening, what if anyone in the world could use a 3-D printer to print out a fully functioning gun?
【小题1】According to the article, in the future, the 3-D printing technology will ___.
A.enable people to make better purchases online |
B.be applied as widely in our daily lives as computers |
C.change the way we make many products |
D.shorten the time it takes for people to get what they buy online |
A.The 3-D printing technology was taken out ofthe factory. |
B.The 3-D printer became more affordable forconsumers. |
C.The 3-D printer was used for medical treatmentfor the first time. |
D.3-D printing technology began to be used invarious fields. |
A.By analyzing a cause and an effect. | B.By making comparisons. |
C.By giving examples. | D.By presenting research findings. |
A.Printing out everything | B.Technology in the future |
C.Online shopping disappearing | D.Great demand for 3-D printers |
SEE a cell phone 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 (喷) ink onto paper line by line, modern 3-D 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 3-D printer uses are mainly plastic, resin (树脂)and certain metals. The thinner each layer is --- from a millimeter 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 3-D 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 3-D printing industry--- printers became much cheaper. For example, 10 years ago a desktop 3-D printer might have cost £20,000 (200,000 yuan), 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, 3-D printing can create just about anything you can think of ---flutes (笛子), 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 3-D printer, according to Science Daily. The fake ear looks and acts exactly like a natural one.
However, as 3-D printing becomes more commonplace, 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 3-D printer, who will visit a retail (零售的) store again?" an expert in 3-D printing told Forbes News. Even more frightening, what if anyone in the world could use a 3-D printer to print out a fully functioning gun?
1.According to the article, in the future, the 3-D printing technology will ___.
A.enable people to make better purchases online
B.be applied as widely in our daily lives as computers
C.change the way we make many products
D.shorten the time it takes for people to get what they buy online
2.What was the big event happening in the 3-D printing industry last year?
A.The 3-D printing technology was taken out ofthe factory.
B.The 3-D printer became more affordable forconsumers.
C.The 3-D printer was used for medical treatmentfor the first time.
D.3-D printing technology began to be used invarious fields.
3.How is the last paragraph developed?
A.By analyzing a cause and an effect. B.By making comparisons.
C.By giving examples. D.By presenting research findings.
4.What is the best title of the passage?
A.Printing out everything B.Technology in the future
C.Online shopping disappearing D.Great demand for 3-D printers
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One topic is rarely mentioned in all the talk of improving standards in our schools: the almost complete failure of foreign-language teaching. As a French graduate who has taught for more than twenty-five years, I believe I have some idea of why the failure is so total. 21 the faults already found out in the education system as a whole — such as child-centred learning, the “discovery” method, and the low expectations by teachers of pupils — there have been several serious 22 which have a direct effect on language teaching.
The first is the removal from the curriculum (课程) of the thorough teaching of English 23 . Pupils now do not know a verb from a noun, the subject of a sentence from its object, or the difference between the past, present, or future.
Another important error is mixed-ability teaching, or teaching in ability groups so 24 that the most able groups are 25 and are bored while the least able are lost and 26 bored. Strangely enough, few head teachers seem to be in favour of mixed-ability school football teams.
Progress depends on memory, and pupils start to forget immediately they stop having 27 lessons. This is why many people who attended French lessons at school, even those who got good grades, have 28 it a few years later. Because they never need it, they do not practice it.
Most American schools have accepted what is inevitable and 29 modern languages, even Spanish, from the curriculum. Perhaps it is time for Britain to do the same, and stop 30 resources on a subject which few pupils want or need.
21. A. Due to B. In addition to C. Instead of D. In spite of
22. A. errors B. situations C. systems D. methods
23. A. vocabulary B. culture C. grammar D. literature
24. A. wide B. similar C. separate D. unique
25. A. kept out B. turned down C. held back D. left behind
26. A. surprisingly B. individually C. equally D. hardly
27. A. extra B. traditional C. basic D. regular
28. A. needed B. forgotten C. practised D. left
29. A. restored B. absorbed C. prohibited D. withdrawn
30. A. wasting B. focusing C. exploiting D. sharing
查看习题详情和答案>>. It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson.
A. until B. after
C. since D. when
查看习题详情和答案>>If you travel around the world , you will be surprised to find just how different the foreign customs can be from your own .
A visitor to India would do well to remember that people there consider it impolite to use the left hand for passing food at table . The left hand is supposed to be used for washing yourself . Also in India , you might see a man apparently shaking his head at another and assume that he is disagreeing . But in many parts of India a shake of the head is a gesture that shows agreement of acceptance .
Nodding your head when offered a drink in Bulgaria is likely to leave you thirsty . In that country you shake your head to indicate “yes” —a nod indicates “no”. The Arabs are known for their hospitality . At a meal in countries on the Arabic Peninsula , you will find that any drinking vessel (容器,器皿)is repeatedly refilled as soon as you drink it up .
In Europe it is quite usual to cross your legs when sitting talking to someone , even at an important meeting . Doing this when meeting an important person in Thailand , however , could cause offence . It is too informal an attitude for such an occasion . Also when in Thailand you are not supposed to touch the head of an adult —it’s just not done . In Japan , it is quite usual for men to plan evening entertainments for themselves and leave their wives at home . In Europe such attitudes are disappearing .
Customs vary from country to country . Visitors may be at a loss as to what to do in a foreign environment . In such circumstances , the golden rule to follow is : When in Rome , do as the Romans do .
60.In which country , a left — hand is not welcomed ? .
A.Thailand B.India C Arabic peninsula D.Bulgaria
61.In which country , if someone shakes his head at another , it shows that he agrees or accepts ?
.
A.Bulgaria B.Thailand C.China D.Arabic Peninsula
62.Which of the following is impolite in Europe ? .
A.to cross your legs
B.to touch the head of an adult
C.That men plan evening entertainment and leave their wives at home
D.To drain the glass in your hand
63.If you don’t know the customs in the country where you visit , the golden rule to follow is .
A.to do as the Romans do B.to do nothing
C.to visit Rome only D.to do as the natives do
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