B
Some 15 years ago, Ross Willard volunteered with a food program in Harrisburg Pa. He found children riding bicycles with brakes that didn't work. The retired railroad manager saw the importance of safely riding for children, so he began repairing bicycle on street corners.
Over time, more and more people came to have their bicycles repaired. Mr. Willard opened his first shop in 2007 and three years later he founded his own company Recycle Cycle Harrisburg. The all-volunteer nonprofit organization has been offering service for residents in the community. Regular visitors include children and their parents, as well as halfway house residents seeking to perform community service hours while so building their own bikes.
The organization has a do-it-yourself philosophy: Although there is no charge for any repair, or even bicycles, most visitors( except young children)are tasked with making their own repairs with the assistance of volunteer trainers.
Since its founding, Recycle Bicycle has distributed thousands of donated bikes to the Harrisburg community averaging about 900 per year in the past decade. He's known as \Bicycle, around the Pennsylvania capital. He estimates that the organization repairs some 3,000 bikes a year.
Sitting in the organization’s shop space, he discusses the volunteerism and sense of service that were imprinted on him as a child by his parents. This led to a strong belief about fixing problems that one finds in the community. 24. Why did Willard begin repairing cycles on street comers? A. He needed to make some extra money. B. He decided to set up his own business. C. He wanted to ensure the safety of cyclists. D. He felt bored with the food program. 25. What does \ A. Young children. B. Volunteer trainers. C. Shoppers. D. Visitors.
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26. Which of the following is the closest in meaning to the underlined word \ A. impressed
27. What is the main idea of the text?
A. Repairing a bicycle yourself can save time and money. B. Community needs bicycle repair service. C. How to repair a bicycle.
D. The organization offers service for the community.
C
A new study shows that air pollution can cause a huge reduction in our intelligence. The study was a project involving researchers at Peking University in China and Yale University in the United States.
The researchers reported that long-term exposure to air pollution can affect a person's mental abilities in two areas: Language and math.
The researchers studied about 25,000 people from across China. Between 2010 and 2014, these Chinese men, women and children were given language and math tests. Then researchers compared the test results with measurements of pollution in the air, namely nitrogen dioxide and sulfur dioxide (二氧化硫).
Xi Chen of the Yale School of Public Health led the study. He and his team found that breathing polluted air can reduce a person's education level by about one year. Chen said that the effect generally is worse for those over 64 years of age, for men and for those with little or no education.
\are more affected than females. And people working outdoors are more affected than people working indoors.
He noted that the youngest people in the study were 10 years old, while the oldest was 90 years old. They came from China's 33 provinces. In his words, the data and facts are convincing and this range of ages and locations across the country provided a real, objective and representative sample.
The researchers noted that the effect of air pollution on verbal ability is even
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B. realized C. ignored D. depended
more serious as people age, especially among men and the less educated. The researchers also stressed that every country, whether developed, developing or poor, should focus on air pollution or humans will face a bad situation. 28. What is the result of the study?
A. Air pollution has a bad effect on people's intelligence. B. Females are more affected by air pollution than males. C. Americans are more affected by air pollution than Chinese. D. People working indoors are actually not affected by air pollution. 29. What did Chen say about the study?
A. It is doubtful. B. It is extremely unfair. C. It is common and not representative. D. It is relatively objective and persuasive.
30. What did the researchers emphasize in the last paragraph? A. The data from the 33 provinces is convincing. B. The whole world should pay attention to air pollution. C. The less educated take more responsibility for air pollution.
D. Air pollution's influence on verbal ability is less serious as people age. 31. Where is the text most likely taken from?
A. A life diary. B. A guidebook. C. A science magazine.
D
To move visual technology into the future, sometimes it helps to make a little noise. Researchers have used sound waves to produce floating 3-D images, create a sense of touch and even supply a soundtrack.
Since the 1940s, scientists have toyed with the concept of acoustic levitation (声悬浮) the use of sound wave vibrations to trap tiny things in midair. The technology has gained greater capabilities in the past decade. Some researchers believe this improvement could lead to applications such as contributing to novel 3- D printing methods, or creating displays that would be visible from any angle without requiring a screen.
Other researchers have also worked on visual displays that use acoustic
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D. A biography.
levitation. In addition to visuals, the system can also produce audible noise to give the display a soundtrack.And the ultrasound speakers can also concentrate vibrations in one spot so that a finger may feel a sense pushing back--a little like the object shown by the floating image is really there Sound waves create a 3-d display!
Display without a screen is remarkably useful. It means that everybody in the room can see the image----any angle, location----and that's extremely helpful. As a communications system, such a display might one day allow users to chat with a 3-D projection(投影)of a person who can turn his or her head to follow as they move around a room.
The display will require a lot more work before you can install it in your living room however. So far, this has been done in the research laboratory. We need to push it a little bit harder. We need to do more analysis to see if it would make sense to create a real display that people would have at home. The current system can only show simple graphics, such as a smiley face or figure eight, in real time.
Still, we are optimistic about the potential for this type of technology. If the system had only one speaker-covered surface instead of two, it could generate images that are bigger than the device itself. We can't make a TV image that's bigger than the TV --- even a projector has to have a projection screen that's bigger than the image itself. But with a volumetric (容积的)display, a small, portable device might produce a much larger picture. We can imagine in the future, having volumetric displays in watches, for example, that create large images that just project out of your watch
32. From the first two paragraphs sound wave vibrations can be used to ______ . A. catch very small objects in midair B. develop 3-D printer's capabilities C. replace a creative display screen D. compose soundtracks by making no noise
33. What do we know about display without a screen? A. It has resulted in visual technology.
B. It is possible to see the image from any direction. C. It is already ripe to create a real one at home.
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