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
难度: 中等查看答案及解析
Dolphin or not a dolphin?That is the question!You see,there are several types of dolphins.Some are saltwater dolphins while others are river dolphins.
＂What are the 32 types of dolphins?"When people are asking the question,they are actually referring to the saltwater dolphins in oceans and seas.The river dolphins living in fresh water,are not included in these species.But what would be the answer in this case if we ask,"Dolphin or not a dolphin?"The answer would obviously be yes.River dolphins still belong to the dolphin family.
Among the 32 types of dolphins,some do not actually wear the word"dolphin”in their names,such as the tucuxi,while others actually have the word"whale"as part of their names even if they are not whales but in fact,belong to the dolphin family,for example, the melon-headed whale and the killer whale.So what would be the answer to the question＂dolphin or not a dolphin?"in these cases?It would be yes.All these species do belong to the dolphin family.
Another question that people ask is,"Are the sea animals that perform at aquariums all dolphins?"So,it always seems to come back to the question,"Dolphin or not a dolphin?"
Well the answer is no in this case.The sea animals that perform there are not all dolphins. The beluga which people tend to think belong to the dolphin family because they show what seems like a smile,like most dolphins,are in fact a species of the whale family.
Now that you read these facts about dolphins,you probably realize that certain sea animals may appear to be part of the dolphin species and that others seem to be part of the whale family,but in either case,it is not obvious and can be surprising when you identify a sea animal as being a dolphin or not a dolphin.That is the question!
1.What do we know about the majority of the dolphins?
A.They look like whales. B.They appear friendly.
C.They perform for audience. D.They live in fresh water.
2.What could be added about dolphins before the last paragraph if you were the author?
A.The living area. B.Dolphin training.
C.The eating habits. D.Further identification.
3.This article can be classified as_____.
A.popular science B.literary fiction
C.a travel diary D.a news report
难度: 中等查看答案及解析
Glenda and Raphael Savitz moved to Newton in 2016.They found themselves welcomed into the neighbourhood with truly open arms. Three months later, they gave birth to Samantha. Unluckily, she was born entirely deaf.The neighbourhood was still excited to welcome little Samantha,of course,but they were worried about her parents.
The neighbours wanted to do something to make things easier for the family.All the neighbourhood agreed to take on the responsibility of learning an entirely second language all for their youngest member. Samantha would grow up learning to "speak" American Sign Language, so her friends and neighbours would learn to speak it right along with her. The group of 18 residents employed a sign language teacher and the whole neighbourhood except Glenda and Raphael Savitz began to learn American Sign Language in a neighbour's big living room.They believed people everywhere wished to have a community with something positive around and Samantha was bringing about.a reason for them to get together.
The neighbours went on learning hard and kept things secret for as long as possible.They wanted thirstily to communicate with the little girl. Finally,t he time had come to show Raphael,Glenda,and Samantha what they had done.The family found themselves deeply moved by the welcoming signs of their friends and neighbours. Glenda recalled it as one of the most affecting experiences she'd ever felt.A present for Samantha would have made her grateful,and this was so much more.Now after neighbours say hello to her parents,they bend down to greet three-year-old Samantha with sign language.At every turn, in the street,the grocery store, or by the canal, Samantha feels included.
1.Which of the following can best describe the neighbourhood?
A.Warm. B.Tolerant.
C.Prejudiced. D.Generous.
2.What did the neighbours think of Samantha?
A.She forced her parents to struggle hard.
B.She set up an example for other children.
C.She caused the situation of her family's poverty.
D.She was an affectional bond of the neighbourhood.
3.What can be the best title for the text?
A.Neighborhood Welcomes A Newborn Baby With Sign Language
B.Neighborhood Learns Sign Language To Communicate With New Family
C.Neighborhood Takes The Newborn Deaf Baby As Sign Language Teacher
D.Neighborhood Learns Sign Language To Comfort Unfortunate New Parents.
难度: 中等查看答案及解析
Last July 4th, three police officers went into a supermarket to get something cold to drink.
Once inside, the cops were __ by a store security guard who asked for __ with a suspected thief. The woman in question didn’t have the look of an __ criminal. She was obviously scared, and her cheeks were wet with ___.
The cops looked __ her bag. “We just saw containers of ___. Nothing else,” Mike told CBS New York.
“I’m hungry,” she explained ___.
Being caught, the woman no doubt expected to be taken to jail for the __ of being hungry while poor. __ the cops had other ideas. “We’ll __ for her food,” Sojo told the __ security guard.
The three men had no discussion at all. It went ___. Instead, each of them __ out 10 dollars to pay the tab. She would not be arrested today.
The woman wept in ___. Drying her eyes with a kerchief, she ___, “Thank you, thank you.”
She wasn’t the only one touched by this act of ___. “It was a very beautiful,____moment,” says Paul, who was at the store. He was so __ by what he’d seen that he posted a photo on Twitter for all to see.
But attention was __ what the officers wanted. They were driven by a far more common emotion. As Sojo told CNN, “When you look at someone’s face and see that they need you and they’re actually hungry, it’s pretty __ as a human being to walk away from something like this.”
1.A.questioned B.examined C.approached D.required
2.A.help B.information C.permission D.trouble
3.A.unskilled B.experienced C.intelligent D.active
4.A.paint B.water C.rain D.tears
5.A.outside B.inside C.around D.down
6.A.food B.fruit C.drinks D.sweets
7.A.anxiously B.shamelessly C.fearfully D.angrily
8.A.action B.mistake C.habit D.crime
9.A.And B.But C.So D.Still
10.A.pay B.look C.apologize D.account
11.A.annoyed B.excited C.surprised D.confused
12.A.unchanged B.uninformed C.unsaid D.uncalled
13.A.took B.brought C.worked D.pointed
14.A.delight B.sorrow C.regret D.gratitude
15.A.recalled B.repeated C.responded D.requested
16.A.thinking B.choosing C.sharing D.caring
17.A.brave B.genuine C.painful D.terrible
18.A.moved B.amazed C.bored D.influenced
19.A.sometimes B.finally C.never D.always
20.A.simple B.natural C.complex D.difficult
难度: 简单查看答案及解析
Which of the following sentences is WRONG?
A.It was sunny,and I suggested going to the beach.
B.Her expression suggested that she know the news.
C.All the evidence suggests that he stole the money.
D.She suggested that he book the tickets in advance.
难度: 中等查看答案及解析
His plan was ____, and the _____won him many _______glances.
A.approved,approve,approving
B.approving,approver, approved
C.approved,approval, approving
D.approving,approve,approved
难度: 简单查看答案及解析
Helping others is a habit, _______ you can learn even at an early age.
A.it B.that C.what D.one
难度: 简单查看答案及解析
As soon as she arrived home,she_____tidying up the room.
A.set about B.set out C.set down D.set off
难度: 中等查看答案及解析
Which of the following sentences is WRONG?
A.There was a time when I hated going to school.
B.It is the first time that the girl has seen such an animal.
C.It is high time that we took some measures to deal with it.
D.Every time when we stopped,everybody would stare at us.
难度: 困难查看答案及解析
______himself to alcohol,the man seldom cared about his family.
A.Adjusting B.Approaching C.Abandoning D.Acknowledging
难度: 中等查看答案及解析
_______she was late for such an important meeting?I can't believe all the efforts she'd made just went down the drain.
A.What if B.So what C.What about D.How come
难度: 中等查看答案及解析
Don't interrupt;just hear me_______before you start talking.
A.on B.off C.out D.over
难度: 中等查看答案及解析
_______with the research,he had no time to play with his son.
A.Occupied B.Occupying C.To occupy D.Having occupied
难度: 简单查看答案及解析
This wall requires______.
A.to repair B.repaired C.repairing D.being repaired
难度: 中等查看答案及解析
Hello! My name is Aurora Carlson. I was born in England, educated in both the French and American schooling systems, and lived most of my life in various places around the United States.
1.
This undying love for everything Chinese started when I was 16. On somewhat of a whim（奇想）, I decided to spend a year as an exchange student in Beijing, attending a local Chinese High School and living with a wonderful Chinese host family.2.After just one year, I became mad about everything in here.
3. I received a B.A. in Chinese and East Asian Studies from the University of Wisconsin-Madison, and can speak and write Mandarin Chinese on a near-native level. Though I am fully aware of the land and have traveled quite a lot throughout the country, my curiosity in the studies of China never fades. 4. A place that once upon a time seemed such a faraway land now feels like a second home; a home with the most welcoming of neighbors.
In my free time, I love to do yoga and cook.5.I hope you join me in Rediscovering China, to explore this wonderful place from a unique foreign viewpoint.
A.I graduated from University of California, Berkeley.
B.I find it really hard to put down Chinese history books.
C.Unfortunately, I have not yet mastered Chinese cuisine.
D.I have landed at CCTV by way of a strong interest in China.
E.On the contrary, it seems that the more I learn, my interest grows even stronger.
F.Before this, I really had no knowledge or connection to this faraway land, just young curiosity.
G.Since then, my life has seemed to focus on gaining a better understanding of the country and its people.
难度: 中等查看答案及解析
请用 M7U1 至 M7U5 所学单词的正确形式把句子补充完整。
1.Although she finished her voyage without a c _____ she did not feel lonely.
2.As we all know,vitamins are b_____to our health.
3.If I were in your shoes,I'd r______immediately and find another job.
4.I don't e______ your journey in this bad weather.
5.Seeing the water flooding in,he u______me to abandon the sinking boat and swim to the bank.
6.David waited for a p______in the conversation so he could ask his question.
7.We need some people to d______brochures for our products to the passers-by.
8.His legs were n______for sitting too long.
9.The mother stood on the p______until the train was out of sight.
难度: 中等查看答案及解析
默写句子。
1.看到没有人留意我们，我把圣诞礼物放下然后离开了。（请使用现在分词）
2.打扮成圣诞老人，在六个可爱的小女孩陪伴下，他骑着一头叫Jumbo的小象走在城市的大街上。（请使用过去分词）
3.Linda一下子站了起来，眼睛冒出愤怒的火光。（请使用独立主格结构）
难度: 困难查看答案及解析
假定你是李华。你正在计划一个充实而有意义的暑假，刚好在网上看到志愿组织Kululekus English Teaching Program的志愿者招募广告。请你写一封邮件申请参加该志愿项目，内容包括：
1.相关能力或经验介绍；
2.计划服务时长。
Kululekus English Teaching program in Mozambique(莫桑比克) aims to provide the local schools with support in a variety of ways, helping to teach children English, Maths and other subjects, at the same time transferring skills and sharing cultural perspectives. Our volunteers work together with the teachers of the respective school as well as the children between the ages of 6 and 15 years.
注意：1. 词数80左右；
2. 可以适当增加细节，以使行文连贯。
Dear Sir/Madam,
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难度: 中等查看答案及解析
阅读下面短文，根据其内容写一篇60词左右的内容概要。
Artificial intelligence(AI)teachers can provide customized teaching for students to meet their unique requirements through analyzing data and deep learning.In the future, they may replace human teachers for basic teaching tasks.Since some students may find it and put new power into traditional teaching patterns.An educational system providing customized teaching centered on students represents the future trend of AI education.
China's AI education has developed rapidly in recent years with the rise of several thousand relevant companies.Currently,AI teachers are able to help students leamn pronunciation,analyze their condition,guide them to learn independently,and even grade writing assignments. Some foreign AI educational systems have been introduced into several domestic schools and have worked well on trial.
However,the promotion of AI education is still facing several difficulties in practice such as low technological levels,inadequacy of data and lack of funds.AI education still depends largely on human teachers' work.Most importantly,it conflicts with current educational patterns because the courses developed by foreign countries are not suitable for Chinese exam-oriented education.Teachers may also find it hard to change their original roles in classrooms since easing control on classes may make them seem irresponsible.These problems need to be handled before the mass promotion of Al education.
With AI teachers,the original teacher-centered classes will be transformed into student-centered ones where teachers only organize the class and provide guidance.Since teachers are supposed to not only equip students with knowledge but also shape their values and help them develop creative abilities,AI teachers will not replace human teachers but will only pose higher requirements of teaching.A combination of AI teachers and human ones can create the best future for Al education.
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难度: 中等查看答案及解析