Bicycles are a great way to get around. They are fun to ride, especially down hills. And, as you speed along the road, you might also think of ways in which you could improve your bike – make it safer, more efficient, or more comfortable. In fact, the two-wheeled machines make for some cool science projects.
This year’s Intel International Science and Engineering Fair (ISEF), held last May in Cleveland, had three bicycle projects from three countries. Like many of the other experiments presented at ISEF, the bike projects showed that some of the most interesting scientific research often begins by taking a closer look at things you care about.
Renato Angulo Chu had even grander ambitions. The 12th-grader from Lima, Peru, wanted to address some of his country’s economic troubles.
“I see a problem in my country,” Renato said, “If you go to the forests in Peru, in some places you can not find electricity. If you go with my bicycle, you can turn on the lights.”
Renato, 16, spent 3 years designing his special Multibike. The device looks like a fixed exercise bike. It has wires fixed along the frame and a blender fastened to the back. Turning the pedals operates the blender. The same principle can be used to sharpen knives or sweep city streets.
The Multibike can work either as a fixed bike or as a bicycle able to travel city streets and country road. It’s made from inexpensive materials, and the user gets exercise while pedaling to operate a machine.
“You pedal the bike, and you can mix any drink you want,” Renato said. More importantly, he added, the same concept could be used to bring light to houses in remote regions of the rainforest.
1. What can we learn from the first paragraph?
A. Bicycles are the best way to go about.
B. Bikes should be made more comfortable to ride
C. You can improve your bicycle for science research.
D. Many inventions are connected with the bicycle.
2. Which of the following is true according to the passage?
A. ISEF is an exhibition displaying bicycle experiments designed by students.
B. Looking closely at things you are concerned about can lead to scientific research
C. Renato’s improvement of the bicycle has solved the country’s great problem.
D. Renato’s special bicycle will soon be put into use in remote areas.
3. The underlined word “address” in the third paragraph probably has the same meaning as _______.
A. make address written B. give up C. work at D. speak at
4. Renato’s special Multibike has all the following functions except ______.
A. making knives sharp
B. mixing any kind of drinks
C. producing electricity
D. operating a machine with its own electricity
5. It can be inferred that Renato’s special bicycle is mainly designed for ______.
A. distant areas in the rainforest without electricity
B. the use of his own family to make life easier
C. the competition of ISEF to win money to support remote rainforests
D. enough exercise by pedaling it.
Have you ever wondered why there are so many skin colors in the world? Do you know why people living in particular areas usually have a certain color? Biology and history are the two reasons for this.
Skin contains something called melanin, which determines a person’s skin color. The more melanin a person has, the darker his or her skin will be. The amount of and the production of melanin are controlled by genetics, but can be affected by other things, such as sunlight. If a person lives in a place with less sunlight, a person’s body will produce less melanin, making the skin lighter.
Skin color is also affected by another source ---- vitamin D. humans all need vitamin D to build bones. People can get it by eating foods such as fish and milk, or from sunlight, so sunlight absorbed by melanin cannot be used for vitamin D production. Therefore, a dark—skinned person will produce less vitamin D than a light—skinned person when they received the same amount of sunlight.
The connection between vitamin D production and skin color is clear when we look at evolution. The earliest humans lived in Africa, their dark skin produced less vitamin D because of their dark skin. As a result, their skin made less melanin, so they could get enough sunlight to produce vitamin D. their skin gradually got lighter and they lost hair. Now, people living in areas with strong sunlight like Africa, have darker skin, while people living in other areas have lighter skin. The exception to this is the Inuit, who live in a place with little sunlight, but have dark skin because they eat a lot of fish and have enough vitamin D.
Evolution has given us a rainbow of skin colors. Humans have always had melanin to determine our skin color. What has changed through history is the environment where we have lived. This has in turn changed our melanin production, and eventually, skin color.
| Brief 1 |
People living in a particular 2 usually have the same skin color and there are many different skin colors in the world. |
| Reason for skin color |
The reasons for different skin colors mainly 3 in biology and history. |
| Biology reasons |
The amount of melanin, by which a person’s skin color is __4 , varies from people to people. The more melanin a person has, the __5 his or her skin will be. Vitamin D is another source 6 skin color. Vitamin D is necessary for humans to build bones. Sunlight contributes to vitamin D in the skin. |
| Historical reasons |
The earliest people in Africa hioknj006Dad dark skin with hair covering it because the sunlight is very strong. When they moved to places where they could not get enough sunlight to __7___ vitamin D, their skin color became lighter. Generally speaking, people in areas with strong sunlight, have darker skin ____8 people in other areas have lighter skin. |
| 9 |
Melanin 10 an important role in our skin color. With our living environment changing, melanin production is changed, which leads to the changes in our skin color. |
Smart phones that react to your moods and televisions that can tell it’s you who’s watching are in your future as Intel Corporation’s top technology expert sets his sights on context-aware computing.
Chief technology officer Justin Rattner showed how personal devices will one day offer advice. “How can we change the relationship so we think of these devices not as devices but as assistants or even companions?” he asked.
Handheld devices could combine already common geographic location technology with data from microphones, cameras, heart and body monitors and even brain scans to offer their owners advice that today only a friend or relative could give.
“Imagine a device that uses a variety of sensors to determine what you are doing at an instant, from being asleep in your bed to being out for a run with a friend, ” Rattner said, “Future devices will constantly learn about who you are, how you live, work and play.’’
Rattner also demonstrated a television remote control that figures out who is holding it based on how it is held, and then learns the viewer’s entertainment preferences.
As the world leader for decades in microchips for servers and desktop computers, Intel is hurrying to catch up in the profitable market for smart phones like Apple’s iPhone and Research in Motion’s Blackberry.
Telephones with e-mail, global positioning and media players are pointing the way to a future where ever more functions are packed into ever smaller mobile devices.
The smart phone industry, including technology giants like LG and Samsung, is likely to sell 270 million phones this year and grow 25 percent in 2011, according to market research company IDC.
“I think you can expect to see features that support context-aware computing starting to appear in Intel products in the near future,” Rattner said.
But analysts say Intel faces an uphill battle getting its microchips into new phones as Nvidia, Marvell and Qualcomm have already made headway with cheap, lower-power processors based on designs by ARM Holdings.
Rattner recognized that questions about privacy and people’s willingness to be intimate with their computers will have to be settled before the future generation of smart phones he described takes off.
“If you think identity threat is a problem today, imagine when your whole context is readily available on the Net.”, he said.The future smart phones can do all of the following except _______.
| A．giving responses to the moods of the owners |
| B．giving proposals like assistants or companions |
| C．offering advice to their owners’ friends or relatives |
| D．telling the phone holders or carriers where they are |
Which of the following are smart phones according to the passage?
| A．iPhone and Blackberry | B．LG and Samsung |
| C．Marvell and Qualcomm | D．Nvidia and ARM Holdings |
From the passage we can infer that _______.
| A．Intel Corporation has become the world leader in the smar tphone market |
| B．Intel Corporation has fallen behind in the profitable market for smart phones |
| C．more functions packed into mobile phones will make mobile devices larger |
| D．the smart phone industry is likely to grow 25 percent in the year of 2011 |
The best title for the passage is likely to be _______.
| A．Smart phones and Televisions | B．Context-aware Computing |
| C．Personalized Televisions | D．Personalized Smart phones |
For more than six million American children, coming home after school means coming home to an empty house. Some deal with the situation by watching TV. Some may hide. But all of them have something in common. They spend part of each day alone. They are called latchkey children. They’re children who look after themselves while their parents work. And their bad condition has become a subject of concern.
Lynette Long was once the headmaster of an elementary school. She said, “We had a school rule against wearing jewelry. A lot of kids had chains around their necks with keys attached. I was constantly telling them to put them inside shirts. There were so many keys, it never came to my mind what they meant.” Slowly, she learned they were house keys.
She and her husband began talking to the children who had them. They learned of the impact(影响) working couples and single parents were having on their children. Fear is the biggest problem faced by children at home alone. One in each three latchkey children the Longs talked to reported being scared. Many had nightmares and were worried about their own safety.
The most common way latchkey children deal with their fears is by hiding. It might be in a shower stall, under a bed in a closet. The second is TV. They’ll often play it at high volume. It’s hard to get statistics on latchkey children, the Longs learned. Most parents are slow to admit they leave their children alone.The main idea about “latchkey children” is that they _______.
| A．are growing in numbers |
| B．are also found in middle-class neighborhoods |
| C．watch too much television during the day |
| D．suffer problems from being left alone |
Which sentence in the second paragraph is the topic sentence?
| A．We had a school rule against wearing jewelry. |
| B．A lot of kids had chains around their necks. |
| C．I was constantly telling them to put inside their shirts. |
| D．They were house keys. |
The main feeling these children have when they are at home by themselves is _______.
| A．tiredness | B．freedom | C．loneliness | D．fear |
We may draw a conclusion that _______.
| A．latchkey children enjoy having such a large amount of time alone |
| B．latchkey children try to hide their feeling |
| C．latchkey children often watch TV with their parents |
| D．it’s difficult to find out how many latchkey children there are |
Education is not an end, but a means to an end. In other words, we do not educate children only for the purpose of educating them. Our purpose is to fit them for life.
In some modern countries it has for some time been fashionable to think that by free education for all — one can solve all the problems of society and build a perfect nation. But we can already see that free education for all is not enough; we find in such countries a far larger number of people with university degree; they refuse to do what they think “low” work; and, in fact, work with hands is thought to be dirty and shameful in such countries. But we have only to think a moment to understand that the work of a completely uneducated farmer is far more important than that of a professor; we can live without education, but we die if we have no food. If no one cleaned our streets and took the rubbish away from our houses, we should get terrible diseases in our towns…
In fact, when we say that all of us must be educated to fit us for life, it means that we must be educated in such a way that, firstly, each of us can do whatever work suited to his brains and ability and, secondly, that we can realize that all jobs are necessary to society, and that is very bad to be ashamed of one’s work. Only such a type of education can be considered valuable to society.The writer of the passage thinks that _______.
| A．education can settle most of the world’s problems |
| B．free education for all probably leads to a perfect world |
| C．free education won’t help to solve problems |
| D．all the social problems can’t be solved by education |
The writer wants to prove that _______.
| A．our society needs all kinds of jobs |
| B．our society needs free education for all |
| C．a farmer is more important than a professor |
| D．work with hands is the most important |
The purpose of education is _______.
| A．to choose officials for the country |
| B．to prepare children mainly for their future work |
| C．to let everyone receive education fit for him |
| D．to build a perfect world |
The passage tells us about _______ of the education.
| A．the means | B．the system | C．the value | D．the type |
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Have you heard or read stories about people who are sick and have been healed by listening to music? Is it a miracle or a successful form of medicine? Can listening to music relieve pain?
Around the world，music therapy(疗法) is being used to treat different medical conditions and illnesses. Some of the ways people use music therapy are to reduce pain，such as in childbirth or during cancer treatments，or to stimulate brain activity after an injury or money loss. Music therapy has also been successful in aiding children to overcome disabilities. Children can move their bodies with the music and stamp along to the beat.
Why is music a useful therapy? Music is soothing and relaxing．but it also stimulates our brains. Emotionally and physically, we respond to the sounds of music. But the complexity of music(the different tempos，rhythms，melodies and harmonies) provokes(激发)the biggest response. Thus，classical music is most typically used for therapies due to complex sounds and patterns. Although rap or hip hop might be fun to listen to，it’s unlikely that such styles of music would produce the same kind of therapeutic effect Playing a musical instrument rather than simply listening to music can also be therapeutic for some people，helping relieve stress and anxiety
Have scientists been able to prove that music can heal disease? Music has been shown to reduce pain in cancer patients by increasing the release endorphins(内啡肽). Endorphins are the body’s natural painkillers，and when we listen to music，our brains respond by releasing these natural painkillers. It has also been known to contribute to the brain development of the babies who have just been born and even babies still in the mother’s womb. Certain types of music have also been found to lower blood pressure and slow a person’s heart rate. Many people are hopeful that music could replace the need for some medications(药物)that are normally used to treat certain illnesses. At present，music therapy is used in a variety of settings such as hospitals，rehabilitation centers，nursing homes，day cares，and schools.
Although music therapy is not yet considered a mainstream treatment，it is recognized more and more as a useful addition to traditional treatment. So next time you are feeling low or stressed out，put on some relaxing music and let the music heal you.
| Title : Music That (1)__________ |
||
| The (2) _______ of music therapy |
to treat different medical conditions and illnesses |
to reduce pain |
| to (5) _______ brain activity |
||
| to overcome(6) ________ . |
||
| How does music therapy (3) ___? |
Music is soothing and relaxing; it stimulates our brains; classical music is a(7) _____due to its complex sounds and patterns. Playing a musical instrument is also useful in (8) ______ stress and anxiety. |
|
| Scientific proofs |
Music has been shown to reduce pain in cancer patients by increasing the release of endorphins. It has also been known to contribute to the brain development of the (9) ____ babies. Certain types of music have also been found to lower blood pressure and slow a person’s heart rate. |
|
| (4) ______ |
Music therapy is recognized as a useful (10) ___to traditional treatment. |
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