Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.
“To provide enough power, we need certain methods with high energy density(密度)”，said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.”
Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro/nanoelectromechanreal systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.
“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.”
His new idea is not only in the battery’s size, but also in its semiconductor(半导体). Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor.
“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure(晶体结构) of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.”
Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.Which of the following is true of Jae Kwon?
| A．He teaches chemistry at MU. |
| B．He developed a chemical battery. |
| C．He is working on a nuclear energy source. |
| D．He made a breakthrough in computer engineering. |
Jae Kwon gave examples in Paragraph 4_________.
| A．to show chemical batteries are widely applied. |
| B．to introduce nuclear batteries can be safely used. |
| C．to describe a nuclear-powered system. |
| D．to introduce various energy sources. |
Liquid semiconductor is used to _________.
| A．get rid of the radioactive waste | B．test the power of nuclear batteries. |
| C．decrease the size of nuclear batteries | D．reduce the damage to lattice structure. |
According to Jae Kwon, his nuclear battery _______.
| A．uses a solid semiconductor | B．will soon replace the present ones. |
| C．could be extremely thin | D．has passed the final test. |
The text is most probably a ________.
| A．science news report | B．book review |
| C．newspaper ad | D．science fiction story |
The Truth Can Set You Free
I recently got pulled over for speeding not far from my new home in Virginia. I hadn’t been paying attention, and I had driven a few miles an hour over the speed limit.
“Can I see your license and registration?” the police officer asked me. I pulled both out for him, and he saw my Pittsburgh address on my Pennsylvania driver’s license.
“What are you doing here?” he asked. “Are you with the army?”
“No, I’m not.” I answered. I explained that I had just moved to Virginia, and I hadn’t had time to re-register yet.
“So what brings you here?”
He had asked a direct question. Without thinking very hard, I gave him a direct answer. “Well, officer,” I said, “since you’ve asked, I have cancer. I have just months to live. We’ve moved down here to be close to my wife’s family.”
“So you’ve got cancer,” he said flatly. He was trying to figure me out. Was I really dying? Was I lying? He took a long look at me. “You know, for a guy who has only a few months to live, you sure look good.”
He was obviously thinking: “Either this guy is pulling one big fat line on me, or he’s telling the truth.” He was trying to question my honesty without directly calling me a liar. And so he had forced me to prove that I was being honest.
“Well, officer, I know that I look pretty healthy. I look great on the outside, but the tumors（肿瘤）are on the inside.” And then, I don’t know what possessed me, but I just did it. I pulled up my shirt, showing the operational scars.
He looked at my scars. He looked in my eyes. He now knew he was talking to a dying man. Well, he wasn’t taking this any further. He handed me back my license. “Do me a favor.” he said, “Slow down from now on.”
The awful truth had set me free. As he went back to his police car, I had a realization. I had been one of those gorgeous blondes (金发美女) who could bat her eyelashes and get out of tickets. I drove home under the speed limit, and I was smiling like a beauty queen.The author was stopped by the police officer because ______.
| A．he didn’t have a license |
| B．he forgot to re-register |
| C．he was seriously ill |
| D．he drove too fast |
The author moved to Virginia probably because ______.
| A．he was homesick |
| B．he served in the army there |
| C．Virginia had better hospitals |
| D．his family could be better cared for |
On hearing about the author’s cancer, the police officer ______.
| A．said it was an excuse |
| B．doubted his honesty |
| C．showed sympathy for him |
| D．asked him to show his scars |
It can be inferred from the passage that the author was ______.
| A．optimistic | B．adventurous |
| C．dishonest | D．romantic |
Summer Rain
The worst days of any summer are the rainy ones. We spend all year looking forward to nice weather and long, hot days. All of winter, with its cloudy days and bitter cold, we dream of those endless days at the beach, lying on the sand and enjoying the bright and burning sun. And then, summer comes, and it rains.
As a child, I would wake up to rainy summer days and come close to crying. It wasn’t fair. We suffered through months of school and experienced bad weather for those short ten weeks of freedom and pleasant weather.
On those rainy summer days, I had nothing fun to do and could only sit inside, staring out at the rain like a bird in a cage. I was an only child, so there was no one else to play with. My father worked from home, so I was not truly alone, but he could not actively play with me since he was at work. It was those days that I would watch whatever was on television or read any books that I could find lying around. I’d drag through the day and pray each night that the rain would not be there the next day.
As an adult, though, my opinion of summer rain has changed. When you have to work every day, summer is not as exciting. Everything seems dull. Such a mindset makes you cheer for anything new or different. I spend the winter dreaming of summer and the summer dreaming of winter. When summer comes, I hate how hot it is. And then I look forward to the rain, because the rain brings with it a cold front, which makes me comfortable. Rainy days are still the worst days of the summer, but summer rain today means positively beautiful—and considerably cooler—weather tomorrow.When the author was a child, he ______.
| A．hated rainy days |
| B．liked staying indoors |
| C．preferred cooler weather |
| D．dreamed on summer days |
We can learn from the passage that the author ______.
| A．had no brothers or sisters |
| B．was often left alone at home |
| C．could enjoy the brilliant sun in winter |
| D．preferred reading to playing outside |
As an adult, the author views summer rain differently because ______.
| A．heknowsit won’t last long |
| B．rain makes the weather cooler |
| C．his summer holiday is very short |
| D．he can better deal with his downtime |
Every day we are exposed to images, videos, music and news. In this age of visual and aural hyper-stimulation, the medium of radio is making a great comeback.
“We’re at the beginning of a golden age of audio,” said US-based podcaster Alex Blumberg in an article in The Sydney Morning Herald. In the last month alone, 15 percent of US adults listened to a radio podcast (播客). These statistics, released by Edison Research, show the successful evolution of traditional radio broadcasts to the present day’s digital podcast format. The term “podcast” was invented in 2004, but the trend only started gaining mainstream popularity in recent years. With the sharp increase in consumer demand for smartphones and tablets, podcast sales have jumped.
The appeal of the podcast partly lies in its multiplatform delivery and on-demand capabilities (功能). You can listen during those extra minutes of the day when you’re walking to the shops, waiting in a queue or riding the subway. Similar to television shows, podcasts are generally free to download and most offer new content every week.
Donna Jackson, 22, Sydney University media graduate, listens to podcasts two or three times a week, via iTurns. “I listen while I’m wandering around the house doing something else. It makes completing a boring task much more enjoyable… And it’s an easy way of keeping in touch with what’s going on in the rest of the world,” she said, “I mainly listen to BBC podcasts, but recently I’ve also been listening to This American Life and Serial. They have a special skill to really draw you in.”
Unlike television and music, the audio format has the potential to create a deep impression on readers. Blumberg says this owes to the podcast’s ability “to create close relationship and emotional connection.” Sydney University undergraduate Hazel Proust, majoring in social work and arts, agrees. “When you’re listening, it feels as if the voice of the podcast’s storyteller is talking directly to you. It’s comforting, ” said Proust.
It seems the age-old tradition of verbal storytelling is very much alive and well.From the first two paragraphs, we can learn that ________.
| A．traditional broadcast has come back |
| B．Americans love listening to the radio |
| C．podcasts have become very popular today |
| D．smartphones sell well because of podcasts |
The writer mentions Donna Jackson mainly to ________.
| A．tell how young people relax themselves |
| B．explain why young people like podcasts |
| C．introduce what programs podcasts are presenting |
| D．show how popular podcasts are presenting |
Paragraph 5 is mainly about ________.
| A．the influence of radios |
| B．the advantage of podcasts |
| C．readers’ impression on radios |
| D．people’s reaction to the medium |
What is probably the best title of the passage?
| A．Return of Radio |
| B．Opinions of Podcast |
| C．Features of Radio |
| D．Technology of Podcast |
As we grow old, we realize that we have so little time to read and there are so many great books that we’ve yet to get around to. Ye re-readers are everywhere around us. For certain fans, re-reading The Lord of the Rings is a conventional practice annually. One friend told me that Jane Austen’s Emma can still surprise him, despite his having read it over 50 times.
New sudden clear understandings can be gained from the process of re-reading. Journalist Rebacca Mead, a long-time Englishwoman in New York, first came across George Eliot’s Middlemarch at 17. Since then, she has read it again every five years. With each re-reading, it has opened up further; in each chapter of her life, it has resonated (引起共鸣) differently. Mead evidenced the large number of ways in which really good books not only stand the test of repeat reads, but also offer fresh gifts each time we crack their spines. These kinds of books grow with us.
Scientists have also recognized the mental health benefits of re-reading. Research conducted with readers in the US found that on our first reading, we are concerned with the “what” and the “why”. Second time round, we’re able to better appreciate the emotions that the plot continues to express. As researcher Cristel Russell of the American University explained, returning to a book “brings new or renewed appreciation of both the great book and its readers.”
It’s true that we often find former selves on the pages of old books (if we’re fond of making notes on the pages). These texts can carry us back to a time and place, and remind us of the kind of person that we were then. We’re changed not only by lived experience but also by read experience – by the books that we’ve discovered since last reading the one in our hand.
More so than the movie director or the musician, the writer calls upon our imaginations, using words to lead us to picture this declaration of love or that unfaithfulness in life. A book is a joint project between writers and readers, and we must pour so much of ourselves into reading that our own life story can become connected with the story in the book.
Perhaps what’s really strange is that we don’t re-read more often. After all, we watch our favourite films again and we wouldn’t think of listening to an album only once. We treasure messy old paintings as objects, yet of all art forms, literature alone is a largely one-time delight. A book, of course, takes up more time, but as Mead confirms, the rewards make it adequately worthwhile.The two books are mentioned in Paragraph 1 mainly to __________.
| A．attract the attention of readers |
| B．introduce the topic of the passage |
| C．provide some background information |
| D．show the similarity between re-readers |
The underlined expression “crack their spines” in Paragraph 2 refers to ________.
| A．recite them | B．re-read them |
| C．recall them | D．retell them |
It can be learned from the passage that __________.
| A．reading benefits people both mentally and physically |
| B．readers mainly focus on feelings on their first reading |
| C．we know ourselves better through re-reading experience |
| D．writers inspire the same imaginations as film directors do |
The purpose of the passage is to __________.
| A．call on different understandings of old books |
| B．focus on the mental health benefits of reading |
| C．bring awareness to the significance of re-reading |
| D．introduce the effective ways of re-reading old books |
Sports are the base of my life, next to my mother who raised me when my dad left us. I have been into sports since I was six years old. I have known many coaches and heard hundreds of their tips, but they usually focused on drills to develop my skills and reach the next level of play.
When I was in Senior Two, I met the new school basketball coach, Brian Pawloski. I thought I was certain to be selected for the school team since I had been in it the year before. I showed up to the tryouts and put out about 90% effort since I thought I’d make it with no problem. That was a big mistake.
Brian Pawloski is the hardest-working coach I have ever met. He didn’t expect 100% effort, he expected 200% effort. One example: he once made us do 40 suicide drills for the 40 lay-ups (投篮) we missed in a game. Some think this is crazy, but it isn’t. After this conditioning practice, as we were getting a cup of cold water to drink, I said, “coach, that was the best practice I ever had.” I was completely sincere. This man was and is the person who influenced me most at my high school. He expects us to be excellent not just on the court but in the classroom. If I am not working on basketball, I am reading a book that he thinks will help us better understand life’s challenges, including Wooden, Coach, and The Screwtape Letters.
In the first two years I slacked off, not putting forth my full potential. Now, unlike the coaches of my youth, this man was interested in how he did off the court. He always made sure I kept up with my studies and was able to be trusted. I can honestly say that on other coach has given me so much advice on how to succeed in basketball, but more importantly, in life. My school is lucky to have such a great person to teach, coach and influence their students. I will always remember my high-school basketball days as one of the hardest times I have ever worked in my life not only in basketball but in my growth as an individual.Different from other coaches, Coach Brian ________.
| A．concentrated on skill training |
| B．trained the team to the edge of death |
| C．expected the team to do well in their studies |
| D．asked the team to do more reading than training |
The underlined phrase “slacked off” in the last paragraph probably means ________.
| A．paid no attention |
| B．showed no interest |
| C．had less passion |
| D．made less effort |
In the author’s eye, Coach Brian is ________.
| A．strict and helpful |
| B．hardworking and honest |
| C．skilled and cruel |
| D．professional and serious |