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 / nanoelectromechanical 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 |
PART FOUR WRITING (45%)
It’s you and I who are to blame for the state of the earth. No question about it. It’s our life-style that is threatening life on Earth, so we must make the changes. The good news is that many of those changes are really quite simple, even enjoyable, but for every careful step we take as individuals, we must press government and industry to take a big step on our benefit. And we must start now. Tomorrow’s too late.
My aim this year is to persuade as many of my friends and colleagues as possible to choose the train, and leave their cars behind too. My gardens have been pesticide(杀虫剂)–free zones for years and I enjoy seeing more wildlife on my doorstep as a result; I’ve tried to reduce my contribution to water pollution too, by using environment-friendly, phosphate(磷)–free washing powder , and by no longer thinking of the toilet as a suitable waste-disposal(处理) point .
I ran after a young lady through town recently to give her back the piece of paper she had carelessly thrown away. She disappeared into a shop, and when I followed her inside and made my presentation, she was doubly embarrassed--she worked there, and the boss gave her a ticking–off too. I’ve started asking fellow drivers at gas stations why they aren’t using unleaded (无铅的) petrol . These are small things, but we have to start somewhere, and every little does help.We can learn from the first paragraph that____________.
| A．you and I are responsible for looking after the environment |
| B．the government and industry are responsible for looking after the environment |
| C．the government is responsible for looking after the environment |
| D．both A and B |
To help the environment, the author is trying to do everything mentioned below EXCEPT_________.
| A．taking the train instead of a car |
| B．avoiding the use of pesticides |
| C．throwing away the old cars |
| D．running after those who throw articles carelessly |
The author ran after a woman through town because he wanted__________.
| A．to find out where she worked |
| B．to give her back the piece of paper she had lost |
| C．to ask her to pay him for picking up the piece of paper. |
| D．to tell her not to throw away pieces of paper carelessly |
The purpose of this passage is to__________.
| A．persuade his friends to take the train |
| B．try to advise us all to protect our environment |
| C．make clear who is responsible for the environment |
| D．inform us of the good news |
| Fun Day To celebrate the Year of the snake Organised by Lam Tin Youth Centre and Kwun Tong High School Date: 2 February 2013 Time: 10 am—5 pm Place: Kwun Tong Playground Fee: $20 (buy three get one free) Programmes: drama, lion dance, magic show and ballet performance Highlights: 1) enter the lucky draw to win a digital camera 2) learn to make festival food Join us on the Fun Day! All are welcome! Free Soft Drinks Note: ● Tickets are available at the General Office of Lam Tin Youth Center ● For those who would like to be a volunteer, please contact Miss Olivia Wong one week before the activity. |
What you have just read is a ________.
| A．note | B．poster | C．schedule | D．report |
What is going to take place on 2 February 2013?
| A．A big event to welcome a Chinese new year. |
| B．A social gathering to raise money for wildlife. |
| C．A party for close friends to meet and have fun. |
| D．A meeting of Kwun Tong High School students. |
How much do you have to pay in total if four of you go together?
| A．$20. | B．$40. | C．$80. | D．$60. |
Which of the following statements is true?
| A．Tickets are sold in Kwun Tong High School. |
| B．Free digital cameras are provided for everybody. |
| C．It’s unnecessary to take soft drinks with you. |
| D．Festival food will be served without extra charge. |
Global financial big dogs are no match for China's "Da Ma", or housewives, who have crowded into gold stores across China, buying up 300 tons of gold over the past two weeks. No wonder gold prices have steadied after taking a dive.
During the May Day holiday, gold stores were crowded with mostly female customers. Most of them are middle-aged "Chinese housewives". This group of buyers has risen to fame recently. They are big spenders and are desperate to get their hands on a bargain. "I bought some gold jewellery and kept them as a gift for my son when he gets married," said a buyer from Shanghai.
The gold business is skyrocketing. "Our sales are growing by the day. Yesterday we sold more than ten million yuan of gold products," a gold store salesperson said. The gold rush in China started about two weeks ago thanks to a decline in global gold prices. Media reports suggest that Chinese housewives have spent about 100 billion yuan, or about 16 billion US dollars, purchasing 300 tons of gold since mid-April. That has helped support gold prices.
"Gold prices depressed since the middle of last month but have risen gradually. That is mainly due to the strong demand from Asian markets," said foreign trader Zhang Chen from Industrial & Commercial Bank of China. "Some people even joked that Chinese housewives have beaten Wall Street analysts." For Chinese people, with limited investment options, the only thing better than buying gold is buying gold at discount prices.What does the author indicate(表明;预示)in the first sentence of the first paragraph?
| A．The global big dogs can’t match with Chinese housewives. |
| B．Chinese housewives spend a great deal of money on gold |
| C．China's "Da Ma" help a lot to support the global economic crisis |
| D．Chinese housewives have a better consumption idea than global financial big dogs . |
We can infer from the passage that_______________
| A．China’s "Da Ma" become the largest gold buyers due to a decline in global gold prices. |
| B．China's "Da Ma" crowded into stores to get gold as the best gifts for sons when they get married. |
| C．China's "Da Ma" are bigger spenders and cleverer than global financial big dogs. |
| D．Chinese housewives are most willing to spend money in buying gold . |
In the writer’s view, Chinese housewives are desperate to get their hands on a bargain because_____.
A. it is worthy to buy gold.
B .they have a strong demand
C. it is at discount prices.
D they have unlimited investment options The author’s description about the passage is ______.
| A．doubtful | B．subjective | C．objective | D．Negative |
A popular saying goes, “Sticks and stones may break my bones, but words will never hurt me.” However, that’s not really true. Words have the power to build us up or tear us down. It doesn’t matter if the words come from someone else or ourselves — the positive and negative effects are just as lasting.
We all talk to ourselves sometimes. We’re usually too embarrassed to admit it, though. In fact, we really shouldn’t be because more and more experts believe talking to ourselves out loud is a healthy habit.
This “self-talk” helps us motivate ourselves, remember things, solve problems, and calm ourselves down. Be aware, though, that as much as 77% of self-talk tends to be negative. So in order to stay positive, we should only speak words of encouragement to ourselves. We should also be quick to give ourselves a pat on the back. The next time you finish a project, do well in a test, or finally clean your room, join me in saying “Good job!”
Often, words come out of our mouths without us thinking about the effect they will have. But we should be aware that our words cause certain responses in others. For example, when returning an item to a store, we might use warm, friendly language during the exchange. And the clerk will probably respond in a similar manner. Or harsh (刻薄的) and critical language will most likely cause the clerk to be defensive.
Words possess power because of their lasting effects. Many of us regret something we once said. And we remember unkind words said to us! Before speaking, we should always ask ourselves: Is it true? Is it loving? Is it needed? If what we want to say doesn’t pass this test, then it’s better left unsaid.
Words possess power: both positive and negative. Those around us receive encouragement when we speak positively. We can offer hope, build self-esteem (自尊) and motivate others to do their best. Negative words destroy all those things. Will we use our words to hurt or to heal? The choice is ours.There is no need for us to feel embarrassed when we talk to ourselves because _________.
| A．almost everybody has the habit of talking to themselves |
| B．talking to ourselves always gives us courage |
| C．we can benefit from talking to ourselves |
| D．it does no harm to have “self-talk” when we are alone |
The underlined part in the third paragraph means that we should also timely ________.
| A．remind ourselves | B．praise ourselves |
| C．make ourselves relaxed | D．give ourselves amusement |
The author would probably hold the view that _________.
| A．encouraging words are sure to lead to kind offers |
| B．negative words may motivate us to make more progress |
| C．people tend to remember friendly words |
| D．it is better to think twice before talking to others |
In which column of the newspaper can you most likely read this passage?
| A．News. | B．Advice column. | C．Health. | D．Language. |
With the start of the new term, students around the country exchange their fun and fashionable clothes for boring school uniforms. But not all campuses are fashion deserts. Colorful sports shoes, school bags, T-shirts and even drink containers are breathing life into campuses.
“The uniform makes us look like a bunch of clones, especially when we are doing morning exercises on the playground,” and Qing Pei, a Senior 2 students from Shanghai Qibao High School. “But boys wear different sports shoes and girls have different decorations(装饰品) in their hair. These are the areas where you can express yourself,” said Qing.
Although it might be strange for boys to talk about fashion, they do care about what they wear in school, especially shoes, according to Qing.
“Nike and Adidas basketball shoes, although they are still the must-have items for many of my friends, are becoming out-of-date,” Qing added. He explained, “Since Liu Xiang ran so fast in Athens, running shoes are becoming popular in this autumn.”
“Still in fashion are the various baseball caps and American-style T-shirts with some English words printed on them,” said Qing. Besides sports shoes and T-shirts, styles and colors of schoolbags are another chance for students to express their taste in fashion. Some bags are made more eye-catching by decorating them with small dolls.
Other fashionable items are colorful drink containers, which are now popular with girls this term.
“Some teachers are surprised to see a teenager sucking a bottle like this at school and criticize it as childish regression(退化). But some girls just love it,” said Yang Rui, a Senior 3 student.What does the underlined part in Paragraph 2 mean?
| A．All the students are clones. |
| B．All the exercises are the same. |
| C．All the students look the same in uniform. |
| D．All the students have similar fashions. |
How do girls express themselves on campus?
| A．They wear different spots shoes. |
| B．They wear school uniforms. |
| C．They have different decorations in their hair. |
| D．They drink coffee from colorful drink containers. |
What are becoming fashionable for schoolboys according to the passage?
| A．Nike and Adidas basketball shoes. |
| B．Baseball caps and Korean-style T-shirts. |
| C．Colorful drink containers. |
| D．Running shoes. |
The writer wants to .
| A．call for people to pay attention to students’ wear |
| B．report students’ great love for fashion |
| C．criticize childish regression on campus |
| D．discuss about school uniforms |