Electrical devices(仪器)could soon use power made by human energy. Scientists say they have developed an experimental device that produces electricity from the physical movement of a person walking , British scientist Max Donelan and other scientists in Canada and the United States developed the device.
The device connects to a person’s knee. As the person walks ,the device captures energy each time the person slows down. To do this ,the device helps with the slowing sown movement of the leg, the movements of the walking person push parts of a small machine that produces electricity. Using the device, an adult walking quickly could produce thirteen watts of electricity in just a minute. Donelan says walking at that speed could produce enough power to operate a laptop computer for six minutes.
There are several possible uses for the device. Developers say it could help people who work in areas without electricity to operate small computers. The device could also he used in hospitals to operate heart pacemakers(起博器), it could even be used to assist in the movement of robotic arms and legs.
The experimental version of the device weighs about one and a half kilograms, but it is too costly for most people to buy, but the researchers hope to make a lighter, less costly version, An improved version should be ready in one year.
The developers hope the device will one day help developing countries; nearly twenty five percent of people around the world live without electric power.
A similar product was invented in 2005 by Larry Rome of the University of Pennsylvania, He created a bag carried on a person’s back that also produces power from walking. The knee device does not produce as much electricity as the bag, but the bag requires the walker to carry a load of twenty to thirty kilograms.The second paragraph mainly talks about
| A．who developed the device |
| B．how the device works |
| C．several possible uses for the devices |
| D．how much electricity the device can produce |
What is the disadvantage of the experimental version of the device?
| A．It is too heavy for the walker to bear |
| B．It is too complex for people to use |
| C．It is too expensive for most people to afford |
| D．It will slow down one’s walking speed |
Compared with the device designed by Larry Rome, this new device
| A．produces power without adding more loads to the walker |
| B．can produce more power in a much shorter time |
| C．needs to be equipped with a battery |
| D．can help the walker walk faster |
From the passage, we can learn that the electrical device can
| A．help housewives operate the washing machine |
| B．make it much easier for us to go online |
| C．produce more electricity than that invented by Larry Rome |
| D．be applied in medical fields to operate heart pacemakers |
What would be the best title for the passage
| A．First device powered by walking will soon be on the market |
| B．Advanced technology brings in a new way to operate heart pacemakers |
| C．Device gives new meaning to the idea of power walking |
| D．Human energy will become a main source of electricity |
"Oh, you must have been a spoiled(宠坏的) kid. You must be really bossy. I wonder what you're going to be like to deal with?" That's often the response Angela Hult gets when people find out she's an only child, she told ABC News, Despite such negative(消极的) remarks, Hult has decided to have only one child herself. And she's not alone.
According to the US' Office for National Statistics, women approaching the end of their childbearing years had an average of l.9 children in 2004, compared with 3.1 for their counterparts in 1976. The percentage of one-child families in Britain had risen from 18 percent in 1972 to 26 percent in 2007.
But even though only children are becoming increasingly common, the traditional view that they're selfish, spoilt and lack social skills holds strong. Even parents of only children, like Hult, are made to feel guilty about having only one child. Worried that they're being selfish and endangering their child's future, they flock to online discussion forums seeking advice. Soon, however, they ask themselves: is this social prejudice really reasonable?
"There have been hundreds and hundreds of research studies that show that only children are no different from their peers(同龄人) ," Susan Newman, a social psychologist at Rutgers University in the US, told ABC News.
This raises another question: why are only children still viewed with such suspicion?
"There is a belief that's been around probably since humans first existed that to have just one child is somehow dangerous, both for you and for the continuation of your race," Toni Falbo, a professor of educational psychology, told the Guardian." In the past a lot of children died, You'd have had to be crazy to only have one. "
Times, of course, have changed and infant mortality(婴儿死亡率) has largely reduced. So what do only children themselves say?
Kayley Kravitz, a blogger for The Huffington Post, grew up as an only child and highly recommends the experience. "Being an only child taught me the most valuable skill of all: the ability to be alone," she said.Which of the following could be the best title for the text?
| A．Are only children lonely? |
| B．Are only children common? |
| C．Are only children dangerous? |
| D．Are only children different? |
What does Susan Newman mean?
| A．Only children are as good as their peers. |
| B．Only children are more selfish and spoiled. |
| C．Parents feel guilty about having only one child. |
| D．Parents will endanger their only child's future. |
What is the common belief since human existed?
| A．The infant death rate always stays high. |
| B．People are crazy to have only one child. |
| C．It's easy for only children to earn their living. |
| D．It's hard to continue the family line with only one child. |
An only child like Kayley _______.
| A．must be difficult to persuade |
| B．can possibly learn to be alone |
| C．should value special skills |
| D．need ignore bad experience |
What's the author's attitude towards having only one child?
| A．Neutral. | B．Negative. | C．Positive. | D．Doubtful. |
In America, Virginia Beach has all the elements of a classic seaside resort: brilliant beaches, a lively boardwalk, plenty of restaurants and nightspots, and amusement rides are sure to appeal to kids. Many believe Virginia Beach is at its best in the off-season, when the town is less crowded but the weather is still mild.
Meanwhile, some safety tips should be followed, enjoying the happiness and excitement the beach offers.
The number l safety tip concerns ocean safety: pay attention to Flag conditions posted on the lifeguard stands. Lifeguards post a red flag to warn when the ocean water is dangerous. Take them seriously! Tourists from land-locked regions are particularly easily attracted by the magic of the waves. However, a calm ocean can become risky without warning. Make sure you swim near a lifeguard. Swimming without lifeguard protection is almost five times as great as drowning at a beach with lifeguards.
Never swim alone. Many drownings involve single swimmers. When you swim with someone else, if one of you has a problem, the other may be able to get help, including signaling for assistance from others.
Don't fight the current. The facts show that some 80% of rescues by lifeguards at ocean beaches are caused by currents. These currents are formed by surf and gravity, because once surf pushes water up the slope of a beach, gravity pulls it back. This can create concentrated rivers of water moving offshore. If you are caught in a rip current, don't fight it by trying to swim directly to shore. Instead, swim parallel to shore until you feel the current relax, then swim to shore. Most rip currents are narrow and a short swim parallel to shore will help bring you to safety.When coming to Virginia Beach, children can enjoy the happiness of .
| A．walking on the road made of wood | B．joining the nightspots |
| C．having interesting rides | D．skiing in the sea |
Many people believe the best time to visit Virginia Beach may be .
| A．after autumn school term beginning | B．in the slimmer vacation |
| C．during the Christmas holiday | D．in the cold winter |
Swimming in the sea you'd better not swim .
| A．with a friend | B．within the sight of the lifeguard |
| C．with the current | D．as far as you like |
From the passage, we can know .
| A．one in five persons swimming in the sea is drowned |
| B．if one with lifeguard were drowning, five persons without lifeguard would be |
| C．some 80% people drowning by the currents are rescued by lifeguards |
| D．some 20% drowning by the currents are rescued by life guards |
The passage mainly tells us .
| A．some safety tips when swimming in the sea |
| B．the happiness and excitement the beach offers |
| C．Virginia Beach has all the elements of a classic seaside resort |
| D．the dangers for tourists from land-locked regions to swim in the sea |
A few degrees can make a big difference when it comes to food storage. Foods can go bad if they get too warm. But for many of the world’s poor, finding a good way to keep food cool is difficult. Refrigerators are costly and they need electricity.
Yet spoiled food not only creates health risks but also economic losses. Farmers lose money when they have to throw away products that they cannot sell quickly.
But in nineteen ninety-five a teacher in northern Nigeria named Mohammed Bah Abba found a solution. He developed the “Pot-in-Pot Preservation/Cooling System.” It uses two round containers made of clay. A smaller pot is placed inside a larger one. The space between the two pots is filled with wet sand. The inner pot can be filled with fruit, vegetables or drinks. A wet cloth covers the whole cooling system.
Food stored in the smaller pot is kept from spoiling through a simple evaporation(蒸发) process. Water in the sand between the two pots evaporates through the surface of the larger pot, where drier outside air is moving.
The evaporation process creates a drop in temperature of several degrees. This cools the inner pot and helps keep food safe from harmful bacteria. Some foods can be kept fresh this way for several weeks.
People throughout Nigeria began using the invention. And it became popular with farmers in other African countries. Mohammed Bah Abba personally financed the first five thousand pot-in-pot systems for his own community and five villages nearby.
In two thousand, the Rolex Watch Company of Switzerland honored him with the Rolex Award for Enterprise. This award recognizes people trying to develop projects aimed at improving human knowledge and well-being. A committee considers projects in science and medicine, technology, exploration and discovery, the environment and cultural history. Winners receive financial assistance to help develop and extend their projects.Which is the best title of the passage?
| A．A Few Degrees can Make a Big Difference for Storage |
| B． A Cool Way to Keep Food from Spoiling |
| C． Spoiled Food Creates Health Risks and Economic Losses |
| D． The Evaporation Process Creates a Drop in Temperature |
What does the third paragraph mainly talk about?
| A．the structure of the invention |
| B．the usage of the invention |
| C．the cost of the invention |
| D．the inspiration of the invention |
What is it that essentially keeps the food in the container from spoiling?
| A．the wet cloth covering the cooling system. |
| B．the moving drier air outside the container |
| C．the wet sand between the containers |
| D．a drop in temperature by evaporation |
According to the passage, where can we possibly see the invention?
| A．rich and advanced families |
| B．scientific experiment laboratory |
| C．poor and underdeveloped area |
| D．supermarket needing to store goods |
We can know from the passage that Mohammed Bah Abba ____________.
| A．invented the controversial cooling system |
| B．financed the systems in all communities |
| C．received financial assistance for his invention |
| D．invented more complicated cooling system later |
When he was just 19, Michael Dell started the company that would dominate the industry.
At the time, IBM personal computers sold in stores for about ＄3,000. After taking them apart and rebuilding them, Dell realized the components (零部件) could be bought for one-fourth the price. Soon he was buying components to reduce the cost. A good business decision, but it meant his room was starting to look like a mechanic’s shop.
“I was quite excited about the possibilities for personal computers and how they could change society. I had this idea to sell the products directly to the users over the phone”, he said. College plans and his parents’ expectations bothered him a lot. But Michael Dell was determined. He drove off to the University of Texas at Austin in August 1983 in a car he’d bought with earnings from selling newspapers. He was surprised that his mother wasn’t suspicious about the three computers in the backseat. By November, news reached his parents that he wasn’t attending classes. On a surprise visit to Austin, they caught their son on spot. Michael Dell told his dad that he wanted to compete with IBM.
Although Michael agreed to focus on his studies, the business chances and the timing couldn’t have been better. The public was becoming more interested in computers, but no one was producing them. In early May, a week before his final exams, Michael started Dell computer Corporation with ＄1,000. He took his exams, and then dropped out of college at the end of his freshman year. It was time to try out his direct-to-customer business model.
“Three years later”, Dell says, “we had already achieved annual sales of about ＄150 million, I was 22 years old then.”What does the underlined word in paragraph 1 mean?
| A．affect | B．develop | C．support | D．lead |
Which of the following is true according to paragraph 2?
| A．Dell discovered a good chance to make money |
| B．Dell could buy a computer at one-fourth the price |
| C．IBM made little money from personal computers |
| D．Dell rebuilt computers in a mechanic’s shop |
When Dell’s parents learned about his absence from class, they .
| A．tried to help with his business |
| B．were too suspicious to accept it |
| C．wanted him to go hack to class |
| D．encouraged him to compete with IBM |
It can be inferred from the article that .
| A．Dell was tired of his college life |
| B．Dell was not devoted to his study at college |
| C．Dell’s college life helped him greatly |
| D．Dell didn’t finish his final exams |
Dell’s experiences show that .
| A．determination and opportunity lead to success |
| B．family support plays an import in one’s success |
| C．there’s no need for all of us to go to college |
| D．we should insist on whatever we are doing |
My daughter Alisa was born blind in her right eye and was bullied (欺侮) pretty severely in school. So I quitted my job as a babysitter and then schooled my daughter heart and soul at home.
A year ago a boy of 14 befriended my daughter on Facebook after reading something Alisa wrote about bullying. Today he messaged her and asked if she would like six tickets to a Colorado Rockies baseball game. They have never met in person but she said, “Sure! That would be great.”
Then I received a call from his mother explaining why her son had chosen my daughter. She said he thought my daughter deserved them because of all the good she does in the community. Her son, she explained, had experienced a similar situation and was also home schooled.
What she said is true. Now my daughter Alisa continues to teach groups of girls in trouble in our community how to look within themselves for the positive and how to be their own person.
Everything taken into consideration, we decided to meet the mother and the boy at a local bike shop. After meeting, the boy approached my car and my daughter gave him a hug and thanked him for his generosity. She told him that she had never been to a baseball game and that she was going to take her entire family, including myself, her dad, little sister, her cousin and an aunt who has brain cancer.
We all thanked one another, got in our car, and went our way. As we drove home my daughter opened the envelope. Inside it were the tickets and ＄100 each to buy hot dogs, pay for parking and not have any worries but a great time.
My daughter has always been the giver and now she and our family are the receivers and I can not tell you how incredibly honored we feel to be on the other end. What an incredible young man to have such a kind idea.What did the author once do according to the passage?
| A．She was a ticket seller. | B．She was a school teacher. |
| C．She was a babysitter. | D．She was a social worker. |
How did the boy get to know my daughter?
| A．They met when buying tickets to a baseball game. |
| B．They got in touch via the Internet. |
| C．They became familiar when talking face to face. |
| D．They went to the same school and met each other. |
Why did the boy want to offer free tickets to Alisa?
| A．Because Alisa is a disabled girl. |
| B．Because he has a lot money to share. |
| C．Because Alisa often helps those in trouble. |
| D．Because he has a similar situation with Alisa. |
What can we learn about the boy?
| A．He is afraid of meeting strangers. |
| B．He always bullies smaller children. |
| C．He is addicted to the internet. |
| D．He receives education at home. |
Which of the following best describes the passage?
| A．Good is rewarded with good. |
| B．A friend in need is a friend indeed. |
| C．Two heads are better than one. |
| D．Where there is a will, there is a way. |
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