题目内容
An object is said ________ if its temperature is much higher than ________ of our bodies.
- A.hot, which
- B.to be hot, that
- C.hot, one
- D.to be hot, whom
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 hardly 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 common, it may bring about certain problems --- such as piracy(盗版). "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 |
There are a lot of differences in life in the US that you can only learn by living here. However, we will try to introduce you to some of the more important cultural differences.
Personal Space
When two people are talking to each other, they tend to stand a distance apart. Each person has an invisible boundary (界限) around their body into which other people may not come.
Interestingly，the average personal distance varies from culture to culture. Americans tend to require more personal space than in other cultures. So if you try to get too close to an American during your conversation, he or she will feel that you are “in their face” and will try to back away.
Try to avoid physical contact while you are speaking, since this may also lead to discomfort.
Tipping(小费)
Restaurants do not include a service charge in the bill, so you should tip the waiter 15% of the total bill. If service is slow or particular bad, some Americans will tip only 10%. If service is particularly good, it is appropriate to tip 20%. If service is so bad that you will never eat in the restaurant again, leave two cents. It tells the waiter that you haven’t forgotten to leave a tip. Tipping is only appropriate in restaurants which offer table service. You do not tip the cashier in a fast food restaurant.
Gestures
To wave goodbye or hello to someone, raise your hand and wave it from side to side, not front to back. Wave the whole hand, not just the fingers. Waving the hand front to back or the fingers up and down means “no”, “stop”, or “go away’. Holding your hand up with the palm facing forward but no movement means “stop”.
If you want to point at an object, extend the index finger and use it to point at the object. It is not polite to point at people.
Although showing your fist with the thumb up or your open hand with the tips of the thumb and index finger together forming an “O” means “OK”， these are stereotypes (老套). Americans understand these gestures, but they are mainly used by actors in movies, not in real life.
【小题1】 If an American to whom you are speaking backs away a little, you’d better __________.
| A．not try to close the gap | B．stop talking with him or her |
| C．back away too | D．ask him or her what happened |
| A．The tip always ranges from 10% to 20% of the total bill. |
| B．You needn’t leave a tip if you will never eat in the restaurant. |
| C．It’s unnecessary to tip the waiter in a restaurant. |
| D．Tipping is not necessary in fast food restaurants. |
A B. C. D.
.
【小题4】We can learn from the passage that in the US ___________________.
| A．it’s natural to touch each other in a conversation. |
| B．it’s polite to leave a tip though the service is bad. |
| C．there is only one gesture meaning “stop”. |
| D．Americans use the same gesture to point at people and objects. |