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 (MNEMS). 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.
1.Which of the following is TRUE of Jae Kwon?
A. He developed a chemical battery.
B. He teaches chemistry at MU.
C. He made a breakthrough in computer engineering.
D. He is working on a nuclear energy source.
2.Liquid semiconductor is used to ________.
A. reduce the damage to lattice structure
B. test the power of nuclear batteries
C. decrease the size of nuclear batteries
D. get rid of the radioactive waste
3.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
4.The text is most probably a ________.
A. book review
B. science news report
C. newspaper ad
D. science fiction story
What should you think about when trying to find your career? You are probably better at some school subjects than others. These may show strengths that you can use in your work. A boy who is good at mathematics can use that in an engineering career. A girl who spells well and likes English may be good at office work. So it is important to know the subjects you do well in at school. On the other hand, you may not have any especially strong subjects but your records show a general satisfactory standard. Although not all subjects can be used directly in a job, they may have indirect value. A knowledge of history is not required for most jobs but if history is one of your good subjects you will have learned to remember facts and details. This is an ability that can be useful in many jobs.
Your school may have taught you skills, such as typing or technical drawing, which you can use in your work. You may be good at metalwork or cookery and look for a job where you can improve these skills. If you have had a part-time job on Saturdays or in the summer, think what you gained from it. If nothing else, you may have learned how to get to work on time, to follow instructions and to get on with older workers. You may have learned to give correct change in a shop, for example. Just as important, you may become interested in a particular industry or career you see from the inside in a part-time job.
Facing your weak points is also part of knowing yourself. You may be all thumbs when you handle tools; perhaps you are a poor speller or cannot add up a column of figures. It is better to face any weakness than to pretend they do not exist. Your school record, for instance, may not be too good, yet it is an important part of your background. You should not be apologetic about it but instead recognize that you will have a chance of a fresh start at work.
1.What is the passage mainly about?
A. The importance of working hard at school.
B. Choosing a career according to one’s strengths.
C. How to face one’s weakness.
D. The value of school work.
2.All the subjects may have direct value for job hunting EXCEPT ________.
A. mathematics
B. English
C. history
D. technical drawing
3.The writer thinks that a student’s part-time job is probably ________.
A. a good way to find out his weak points
B. of great use for his work in the future
C. one of the best ways of earning extra money
D. a waste of time he could have spent on study
4.From the passage we learn that if a student’s school performance is not good, he ________.
A. should pay more attention to learning skills and developing abilities
B. will be regretful about his bad results
C. may also do well in his future work
D. should restart his study at school
Once upon a time, a daughter complained to her father that her life was unhappy and that she was tired of struggling all the time.
Her father, a chef, took her to the kitchen. He filled three pots with water and placed each on a high fire. Once the three pots began to boil, he placed potatoes, eggs and coffee beans in them. After 20 minutes, he took them out, putting the potatoes and eggs in a bowl and the coffee in a cup. Turning to his daughter, he said, “Look closer, and touch the potatoes.” She did and noted that they were soft. He then asked her to take an egg and break it. After pulling off the shell, she observed the hard-boiled egg. Finally, he asked her to taste the coffee. Its good smell brought a smile to her face.
“Father, what does this mean?” she asked. He then explained that the potatoes, the eggs and the coffee beans were in the same adversity (逆境)—the boiling water. However, each one reacted differently.
The strong and hard potato became soft and weak in boiling water. The egg was fragile, with the thin outer shell protecting its liquid until it was put in the boiling water. Then the inside of the egg became hard, However, the coffee beans were unique. After they were exposed to the boiling water, they changed the water and created something new. “Which one do you want to be like?” he asked. “When adversity knocks on your door, how will you respond?”
In life, challenges happen to us all, but the only thing that truly matters is what happens within us.
1.Why did the girl complain to her father?
A. Because of her father’s busy work.
B. Because of her hard life.
C. Because of her tiring job.
D. Because of the food her father cooked.
2.What can we infer from this story?
A. Different people have different reactions towards adversity.
B. The father was good at cooking.
C. The girl didn’t like the potatoes and eggs.
D. The girl liked the coffee best.
3.What does the underlined word “fragile” mean in the 4th paragraph?
A. thick
B. hard
C. strong
D. easily-broken
4.What would be the best title for the passage?
A. Father and daughter
B. A chef and coffee beans
C. Challenges and responses
D. Adversities and a chef
Bike Share Toronto is the city’s official bike share program, designed to give locals and visitors a fun, affordable and convenient alternative to walking. taxis, buses and the subway. There are 200 Bike Share Toronto stations and 2,000 bikes across the city, making Bike Share the most accessible way to get around and explore.
How it works
●Become an Annual Member or buy a day Pass to access the system.
●Find an available bike nearby, and get a ride code or use your member key to unlock it.
●Take as many short rides as you want while your pass or membership is active.
●Return your bike to any station, and wait for the green light on the dock(停靠点) to make sure it’s locked.
Choose a plan
●For Visitors
Day Pass: $7. Unlimited 30-minute rides in a 24-hour period.
3-Day Pass: $15. Unlimited 30-minute rides in a 72-hour period.
●For locals
Monthly Pass: $25. Unlimited 30-minute rides for a month.
Annual Membership: $90. Unlimited 30-minute rides for a whole year. The Annual Membership is the best deal for locals of Toronto and other frequent riders.
The fee of the first 30 minutes of each ride is included with the membership or pass price. Don’t charge extra fees if you drop off your bike within 30 minutes at any other station. If you keep a bike out for longer than 30 minutes at a time, you will be charged an extra fee, $1.50 for the first extra 30 minutes, $4 for the next 30 minute, and $7 for each additional 30 minutes after that.
Contact us
●Customer Service: (855)898-2388
●Repair Service: (855)-2378
●Corporation Partners: (855)898-2398
●Employment Opportunities: (855)898-2498
1.Which is the most suitable choice for locals in Toronto?
A. Day Pass.
B. 3-Day Pass.
C. Monthly Pass.
D. Annual Membership.
2.How much will the extra fee be if you travel for two hours by bike?
A. $5.5.
B. $9.5.
C. $12.5.
D. $15.5.
3.If you want to work at Bike Share Toronto, which of the following numbers is for contact?
A. (855)898-2388
B. (855)898-2378
C. (855)8989-2398
D. (855) 898-2498
假定你是李华，最近你的美国笔友Jack发来邮件说他的第一部小说出版了，并给你寄了样书（sample copy）。请用英语给他回一封邮件， 主要内容如下：
1. 表示祝贺；
2. 感谢赠书；
3. 希望给你提出写作建议。
注意：1. 词数100左右（开头和结尾已给出，但不计入总词数）；
2.可以适当增加细节，以使行文连贯。
Dear Jack,
__________________________________________________________________________________________
__________________________________________________________________________________________
__________________________________________________________________________________________
__________________________________________________________________________________________
__________________________________________________________________________________________
____________________________________________________________________
Looking forward to your early reply.
Yours,
Li Hua
文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意： 1. 每处错误及其修改均仅限一词；
2. 只允许修改10处，多者（从第11处起）不计分。
One day, I was doing my homework in the bedroom. All of sudden, the light went out, leaving me in totally darkness. My mother came in with a candle. When I light the candle, the bedroom was brightened at once. I looked at the candle and was lost in thoughts. It is very small, and it isn’t worth many. But what it gives us are great. It brightens the way of many scientist; it brightens the desks of my teachers; it also brightens my mind. I think I should learn with the candle. Small as it is, but it tries its best to giving us light and heat.
