A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech integrated systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.
“It’s extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components. “The added difficulty with a project like this is that actually none of those components are off the shelf and so we have to develop them all on our own,” he said.
They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings has a number of interdependencies on the individual components, each of which individually has to perform well, but then has to be matched well to everything it’s connected to,” said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.
While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers’ fields or on the battlefield. “Basically it should be able to take off, land and fly around,” he said.
Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. “You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead,” he said. “So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis.”
1.The difficulty the team of engineers met with while making the robotic fly was that __________.
A. they had no model in their mind
B. they did not have sufficient time
C. they had no ready-made components
D. they could not assemble the components
2.It can be inferred from paragraphs 3 and 4 that the robotic fly __________.
A. consists of a flight device and a control system
B. can just fly in limited areas at the present time
C. can collect information from many sources
D. has been put into wide application
3.Which of the following can be learned from the passage?
A. The robotic flyer is designed to learn about insects.
B. Animals are not allowed in biological experiments.
C. There used to be few ways to study how insects fly.
D. Wood’s design can replace animals in some experiments.
4.Which of the following might be the best title of the passage?
A. Father of Robotic Fly
B. Inspiration from Engineering Science
C. Robotic Fly Imitates Real Life Insect
D. Harvard Breaks Through in Insect Study
科目：高中英语 来源：2014-2015学年河北邯郸高三摸底英语试卷（解析版） 题型：阅读理解
I teach geography at UNLV three times per week. Last Monday, at the beginning of class, I cheerfully asked my students how their weekend had been. One young man said that his weekend had not been so good. He had his wisdom teeth removed. The young man then asked me why I always seemed to be so cheerful. “I choose to be cheerful.” I said. Then I told them a story.
In addition to teaching here at UNLV, I also teach out at the community college in Henderson, 17 miles down the freeway from where I live. One day I drove those 17 miles to Henderson. I exited the freeway and turned onto College Drive. I only had to drive another quarter mile down the road to the college. But just then my car died and wouldn’t start again. So I left my car there and marched down the road to the college.
As soon as I got there I called AAA (美国汽车协会)and arranged for a tow truck (拖车) to meet me at my car after class. The secretary in the office asked me what had happened. “This is my lucky day.” I replied, smiling.
“Your car breaks down and today is your lucky day?” She was puzzled. “What do you mean?”
“My car could have broken down anywhere along the freeway but it didn’t.” I replied, “Instead, it broke down in the perfect place: off the freeway, within walking distance from here. I’m still able to teach my class, and I’ve been able to arrange for the tow truck to meet me after class.” The secretary’s eyes opened wide, and then she smiled. I smiled back and headed for class. So ended my story.
I scanned the sixty faces in my class at UNLV. Despite the early hour, no one seemed to be asleep. Somehow, my story had touched them. Or maybe it wasn’t the story at all. In fact, it had all started with a student’s observation that I was cheerful. An Indian wise man once said, “Who you are speaks louder to me than anything you can say.” I suppose it must be so.
1. Why did the author tell his students the story?
A. To share his lucky experience.
B. To make his class more lively.
C. To draw all students’ attention.
D. To encourage his students to be positive.
2. What happened to the author on his way to the community college?
A. He parked his car in a perfect place.
B. He called AAA for a tow truck to meet him.
C. He covered the last quarter mile on foot.
D. He drove off the freeway at a wrong exit.
3.By saying “it wasn’t the story at all”, the author means that_______.
A. His story is not convincing
B. He shouldn’t have told the story
C. His attitude to life has inspired the students
D. His story is not as interesting as expected
4.What can be concluded from the passage?
A. Easier said than done.
B. You are what you choose.
C. Behind bad luck comes good luck.
D. A good beginning makes a good ending.
查看答案和解析>>
科目：高中英语 来源：2015-2016学年辽宁大连第二十高级中学高二上学期期末英语试卷（解析版） 题型：阅读理解
“If you want to see something well, reach out and touch it!”
That may seem a strange thing to say．But touching things can help you to see them better．
Your eyes can tell you that a glass ball is round．But by holding it in your hands, you can feel how smooth and cool the ball is．You can feel how heavy the glass is．When you feel all these about the ball, you really see it．
With your skin, you can feel better．For example, your fingers can tell the difference between two coins in your pockets．You can feel a little drop of water on the back of your hand, too．
You can even feel sounds against your skin．Have you ever wanted to know why some people like very loud music? They must like to feel the sounds of music．
All children soon learn what “Don’t touch!” means．They hear it often．Yet most of us keep on touching things as we grow up．In shops, we often have to touch things before we buy them．
The bottoms of our feet can feel things, too．You know this when you walk on warm sand, cool grass or a hard floor．All feel different under your feet．
There are ways of learning to see well by feeling．One way is to close your eyes and try to feel everything that is touching your skin．Feel the shoes on your feet, the clothes on your body, the air on your skin……
Most museums are just for looking．But today some museums have some things to touch．Their signs say, “Do touch!” There you can feel everything on show．
1.By touching things,___________．
A．you will have a strange feeling
B．you will learn how to reach out
C．you can see things better
D．you can tell what colors they are
2.Which of the following best serves as the best title of the story?
A．Touching by Feeling
B．To See or to Feel
C．Seeing by Feeling
D．Seeing Is Believing
3.When people buy things in shops, they often _________．
A．try them on first
B．put their right hand on them
C．just have a look
D．feel and touch them
查看答案和解析>>
科目：高中英语 来源：2016届山东日照一中高三上学期期末英语试卷（解析版） 题型：短文改错
短文改错
假定英语课上英语老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中至多有两处。错误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号（∧），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限一词。
2. 只允许修改10处，多者（从第11处起）不计分。
Last weekend’s concert, organized and performing by the students of the Welsh Community College, was great success. The student had been practicing for months for the concert. They were excited that when they heard Gareth Jones was coming to present the prizes. Over 100 young performers play a mixture of jazz, classical or folk music. One of the highlights were 14-year-old Megan Evans, playing traditional Welsh folk songs. The concert ended with a very loud pop tune and anyone in the hall stood up and danced with the music. It was a magically atmosphere and a wonderful evening.
查看答案和解析>>
科目：高中英语 来源：2016届河北省高三上学期七调考试英语试卷（解析版） 题型：完形填空
完形填空
阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项。
This is the story of two lovers, who finally got married. Both of them were romantic at first, ________on the walk of life, problems, quarrels, profession came into their life.
One day, she finally decided “I want to break up”. “Why?” he asked.
“I am ________ .” She answered.
He kept silent the whole night, seemingly in deep ________ . Finally he asked, “What can I do to ________ your mind?”
Looking into his eyes, she said, “Answer my question. If you can ________ my heart, Let’s say, I want a flower ________ on the face of a mountain cliff(悬崖), we are both sure that picking the flower will cause your ________ . Will you do it for me?”
He said, “I will give you my ________ tomorrow.”
She woke up the next morning, found him gone, and saw a piece of paper on her bed, which ________ , “My dear, I would not pick that flower for you. The ________ are ...”
“When you use the computer you always ________ the software and you cry in front of the screen. I have to save my fingers so that I can help to ________ the programs(程序). You always leave the house keys behind, so I have to save my ________to rush home to open the door for you. You love traveling but always lose your way in a ________ city. I have to save my eyes to show you the way. You always ________at the computer, and that will do nothing good for your eyes. I have to save my eyes ________ when we grow old, I can help to cut your nails and help to remove those________ white hairs.”
“Thus, my dear, ________ I am sure that there is someone who loves you more than I do, I can not pick that flower yet, and die...”
That’s life, and ________. Flowers, and romantic moments are only used and appear on the ________ of the relationship.
Under all this, the pillar (柱子) of true love stands.
1.A. but B. and C. while D. so
2.A. lonely B. worn out C. dead D. alone
3.A. sorrow B. anger C. shade D. thought
4.A. speak B. keep C. blow D. change
5.A. represent B. expand C. convince D. warm
6.A. grown B. growing C. living D. planted
7.A. death B. hurt C. wound D. injury
8.A. decision B. choice C. opinion D. answer
9.A. wrote B. informed C. read D. printed
10.A. answers B. messages C. purposes D. reasons
11.A. run out B. put up C. mess up D. use up
12.A. restore B. repair C. fix D. mend
13.A. strength B. life C. energy D. legs
14.A. big B. strange C. modern D. crowded
15.A. glance B. stare C. glare D. look
16.A. as if B. now that C. in case D. so that
17.A. inspiring B. annoying C. rough D. refreshing
18.A. unless B. even if C. although D. if
19.A. warmth B. couple C. love D. power
20.A. nature B. way C. course D. surface
查看答案和解析>>
科目：高中英语 来源：2015-2016学年吉林大学附中高二上学期期末英语试卷（解析版） 题型：其他题
单句填空
阅读下面句子并根据句意或结构完成每个句子，并将答案写在答题纸上。
1.You should be ___________ (感到羞耻) of your bad manners.
2.If you really need something to believe in, then believe in your own ___________ (潜能)
3.Don’t be too ___________ (乐观) about your success. More hard work is needed.
4.Tom was ___________ (任命) to be manager of the department for he was fit for the job.
5.We waited with ___________ (焦虑) for the news of her safe arrival.
6.What is his first i___________ on you? Is he the right person for the position?
7.From the survey they c___________ that too much exercise does harm to health.
8.The parents treated the boy very well though he was their a___________ son.
9.Who could p___________ exactly what would happen in the future? There is too much uncertainty.
10.You will solve the problem if you c___________ your attention on it.
查看答案和解析>>
科目：高中英语 来源：2015-2016学年黑龙江大庆实验中学高二下开学考英语卷（解析版） 题型：七选五
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Four Ways to Be a Great Roommate
Having a roommate can be one of the best experiences in college or, easily, one of the worst.
1. Follow these tips to avoid the common mistakes that turn good roommate relationships sour.
◇Talk things out.
Communication is key. If something happens, sit down with your roommate and have a face-to-face conversation. I've seen roommate relationships fall apart because something happens and, instead of talking to each other, the two start complaining about their roommates behind their backs. 2.
◇Don't expect to be best friends.
Some roommates become the best of friends, and some don't. Don't put pressure on yourself or your roommate, especially when you first meet. 3. And if your roommate doesn't end up being your best friend, don't worry.
◇Ask before you take.
This applies to food, clothes and anything else. If you want to keep a relationship going, show your roommate that you have respect for what is his or hers by asking first. 4.
◇Clean up after yourself.
This should do without saying. Don't be lazy. Or, at least, don't bury your roommate in your clothes and garbage. Most people I've come across in college are messy. 5. But being considerate with where you put your stuff will help you avoid conflict.
A. So you need to think twice before you help your roommates out.
B. This creates nothing but awkward situations and unhappiness.
C. Even if you both agree to share everything, you should still ask.
D. You don't have all the time to clean your room and keep it organized.
E. It all starts with you to have a good relationship with your roommate.
F. Sometime you get stuck with someone who has tons of negative energy.
G. Remember, you're trying to make a new friend, not to scare your roommate away.
查看答案和解析>>
科目：高中英语 来源：2015-2016学年北京怀柔区高一上学期期末考试英语试卷（解析版） 题型：单项填空
The reporter said that the UFO ________ from the east to the west when he saw it.
A. was travelling B. travelled
C. had been travelling D. was to travel
查看答案和解析>>
科目：高中英语 来源：2016届湖南衡阳八中高三上学期9月月考英语试卷（解析版） 题型：阅读理解
Sometimes people call each other "freaked-cat", but have you ever thought about this expression? When a cat is frightened, its heart starts beating faster, its muscles get tense, and there are changes in the chemicals in its bloodstream. Although the cat doesn't realize this, its body is getting ready for action. If the danger continues, the animal will do one of two things. It will defend itself, or it will run away as fast as it can.
Something like this also happens to people. When we are excited, angry, scared, or aroused by other emotions , our bodies go through many physical changes. Our hearts beat faster, and our muscles get tense. All of these changes make us more alert and ready to react. We, too, get ready to defend ourselves or run.
Human beings, however, have a problem that animals never face. If we give way to our feelings and let them take over, we can get into trouble. Have you ever said something in anger —or hit somebody—and regretted it later? Have you ever shouted at a teacher, told somebody you were lonely, or said you were in love, and then wished later you had kept your mouth shut?It isn't always clever to express your feelings freely.
Does this mean that it's smarter always to hide our feelings? No! If you keep feelings of anger, sadness, and bitterness hidden away or bottled up inside, your body stays tense. Physical illness can develop. It can actually be bad for your health. It isn't good to keep pleasant feelings inside either; all feelings need to be expressed.
Feelings that you keep all bottled up inside don't just go away. It's as if you bought some bananas and stuck them in a cupboard. You might not be able to see them. but before long you' d smell them. And if you opened the cupboard, chances are that you'd see little fruit flies flying all over them. They'd be rotten.
You can try to treat emotions as if they were bananas in the cupboard. You can hide them and you can pretend they don't exist, but they'll still be around. And at last you'll have to deal with them. just like those bananas.
1. The best title for this article is_____.
A. Emotions Affect Our Bodies
B. What Happens to A Frightened Cat
C. What Happens to An Excited Person
D. Feelings That People Have
2.What does the word "freaked" mean in the first sentence?
A. excite B. scared C. angry D. shocked
3. According to the passage, we may conclude that we human beings_____.
A. have fewer problems than animals
B. have the same problems as animals
C. have more problems than animals
D. have cleverer problems than animals
4.The author wrote this article in order to_____.
A. give us some advice on how to express our feelings
B. make us face the problem that we have to deal with feelings
C. make us know that it isn't always wise to express our feelings freely
D. tell us that it isn't good to keep feelings inside
查看答案和解析>>
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com
