Scientists from South Korea are trying to convert（转化）sound waves into electricity. The research could lead to charging a cell phone from a conversation or providing energy to the nation’s electricity system generated（产生）by the noise during rash-hour traffic.
“Just as speakers transform electrical signals into sound, the opposite process —turning sound into a source of electrical power — is possible,” said Young Jun Park and Sang-Woo Kim, the joint authors of a new article in the journal Advanced Materials.
Harvesting energy from phone calls and passing cars is based on materials known as piezoelectrics. When bent, piezoelectric materials turn that mechanical energy into electricity. Lots of materials are piezoelectric: cane sugar, quartz （石英）and even dried bone which could create an electrical charge when stressed. For decades, scientists have pumped electricity into piezoelectric materials for use in environmental sensors, speakers and other devices.
Over the past few years, however, scientists have made dramatic advances in getting electricity out of piezoelectric devices. In an experiment, by using sound waves, which at 100 decibels（分贝）were not quite as loud as a rock concert （a normal conversation is about 60-70 decibels）, the South Korean scientists produced a mild electrical current of about 50 millivolts（毫伏）. The average cell phone requires a few volts to function, several times the power this technology can currently produce.
“But the real question is whether there is enough surrounding noise to act as a power source as for a cell phone,” said McAlpine, a leading scientist. A consumer probably wouldn’t want to attend a rock concert or stand next to a passing train to charge his cell phone. The South Korean scientists agree but they expect to get a higher power output as they continue their work.
1.According to the two South Korean scientists, ________.
A．sound waves can travel faster than electricity
B．new materials can send cell phone signals better
C．using cell phones adds to heavy traffic in rush hour
D．electricity and sound can be transformed into each other
2.We know from the passage that piezoelectric materials ________.
A．can produce electricity when stressed
B．are good at changing electricity into sound
C．can reduce the noise of passing cars
D．have been widely used in phones and cars
3.It can be inferred from the South Korean scientists’ experiment that ________.
A．it is hard to change sound into electricity under current conditions
B．it is impossible to make use of loud sound
C．the technology has a long way to go to have a practical use
D．the technology can power cell phones easily
4.What McAlpine doubts about the technology is ________.
A．the noise pollution B．the sound resource
C．the cost of piezoelectrics D．the safety of devices
高三英语阅读理解困难题
Scientists from South Korea are trying to convert（转化）sound waves into electricity. The research could lead to charging a cell phone from a conversation or providing energy to the nation’s electricity system generated（产生）by the noise during rash-hour traffic.
“Just as speakers transform electrical signals into sound, the opposite process —turning sound into a source of electrical power — is possible,” said Young Jun Park and Sang-Woo Kim, the joint authors of a new article in the journal Advanced Materials.
Harvesting energy from phone calls and passing cars is based on materials known as piezoelectrics. When bent, piezoelectric materials turn that mechanical energy into electricity. Lots of materials are piezoelectric: cane sugar, quartz （石英）and even dried bone which could create an electrical charge when stressed. For decades, scientists have pumped electricity into piezoelectric materials for use in environmental sensors, speakers and other devices.
Over the past few years, however, scientists have made dramatic advances in getting electricity out of piezoelectric devices. In an experiment, by using sound waves, which at 100 decibels（分贝）were not quite as loud as a rock concert （a normal conversation is about 60-70 decibels）, the South Korean scientists produced a mild electrical current of about 50 millivolts（毫伏）. The average cell phone requires a few volts to function, several times the power this technology can currently produce.
“But the real question is whether there is enough surrounding noise to act as a power source as for a cell phone,” said McAlpine, a leading scientist. A consumer probably wouldn’t want to attend a rock concert or stand next to a passing train to charge his cell phone. The South Korean scientists agree but they expect to get a higher power output as they continue their work.
1.According to the two South Korean scientists, ________.
A．sound waves can travel faster than electricity
B．new materials can send cell phone signals better
C．using cell phones adds to heavy traffic in rush hour
D．electricity and sound can be transformed into each other
2.We know from the passage that piezoelectric materials ________.
A．can produce electricity when stressed
B．are good at changing electricity into sound
C．can reduce the noise of passing cars
D．have been widely used in phones and cars
3.It can be inferred from the South Korean scientists’ experiment that ________.
A．it is hard to change sound into electricity under current conditions
B．it is impossible to make use of loud sound
C．the technology has a long way to go to have a practical use
D．the technology can power cell phones easily
4.What McAlpine doubts about the technology is ________.
A．the noise pollution B．the sound resource
C．the cost of piezoelectrics D．the safety of devices
高三英语阅读理解困难题查看答案及解析
In South Korea, students pay for classes in everything from K-pop auditions (韩流试镜)to real estate (房地产)deals. Now, top Korean firms are using artificial intelligence (AI) in hiring, and job-seekers want to learn how to beat the robots.
From his basement office in Seoul, career consultant Park Seong-jung is among those in a growing business of offering lessons in handling recruitment screening by computers, not people. Video interviews using facial recognition technology to analyze character are key, according to Park.
"Don't force a smile with your lips," he told students looking for work in a recent session, one of many he said he has conducted for hundreds of people. "Smile with your eyes".
Classes in dealing with Al in hiring, are still a tiny part of the country's multi-billion-dollar cram school (补习学校)industry. But classes are growing fast, operators like Park's People & People consultancy claim, offering a three-hour package for Up to 100,000 won ($86).
There's good reason to see potential. As many: as 8 out of every 10 South Korean students are estimated to have used cram schools, and high youth unemployment in the country—nearly one in four young people are not in the workforce—offers a motivation not present in other countries where cram schools are popular, like Japan.
One AI video system reviewed by Reuters asks candidates to introduce themselves, during which it spots and counts facial expressions including "fear" and "joy" and analyses word choices. AI hiring also uses "gamification" to judge a candidate's personality and adaptability by putting them through numbers of tests. Preparing for such tests doesn't necessarily involve simply memorizing answers. Some games don't even have a 'right answer', as they are aimed to spot the problem-solving attitude of the applicant.
Consultant Park said he gave Al firing talks to more than 700 university students, graduates and lecturers in 2019. In an online chat room monitored by Park, with more than 600 participants, numerous messages indicate thanks for the classes and success in AI interview quests. "Students are struggling from the emergence of AI interviews. My goal is to help them be fully prepared for what they will be dealing with," said Park.
1.What does Park Seong-jung do?
① He gives students lectures about Al hiring.
② He handles his company s recruitment.
③ He analyzes character by using Al technology.
④ He keeps an eye on an online chat room.
A.①④ B.②③
C.①② D.③④
2.Gamification is mainly used to judge the following EXCEPT candidates' .
A.personality B.adaptability
C.problem-solving attitude D.memory ability
3.What's the main idea of this passage?
A.Smile with eyes is better than smile with lips.
B.Companies are increasingly using Al in recruitment.
C.Classes are available in dealing with Al in hiring.
D.Cram schools are popular in South Korea.
4.What may be discussed in the next paragraph?
A.People's attitude towards other types of cram schools.
B.Examples of struggling students who didn't take classes.
C.Companies' strategy against fully prepared applicants.
D.The next step of those who have passed the interview.
高三英语阅读理解中等难度题查看答案及解析
GWANGJU, South Korea, Sept. 28，2013 (Xinhua) — Cultural ministers from China, Japan and South Korea participating in the 5th China-Japan-South Korea Ministerial Conference on Culture held here Saturday agreed to strengthen cultural exchange and cooperation to promote the cultural prosperity of East Asia.
Cai Wu, China's Minister of Culture, Hakubun Shimomura, Minister of Education, Culture, Sports, Science and Technology of Japan, and Yoo Jinryong, Minister of Culture, Sports and Tourism of Korea attended the meeting in the South Korean city with more than 2,000 years of history.
At the meeting, Cai said that the east and west differ in history, culture and values, but the East Asia as a whole, especially China, Japan and South Korea, should take good advantage of their cultural and historical similarities, trying to create “shared East Asia value”and seeking a greater say around the world.
The ministers drew the Gwangju Joint Document at the meeting to strengthen cultural exchange and cooperation in the fields of culture industry, exhibitions, cultural heritage preservation and the youth exchanges to promote the program of “East Asia City of Culture.”
China, Japan and South Korea also agreed that the host country of the annual ministerial meeting will organize a joint cultural festival, including art performances, exhibitions, academic seminars and other relevant events starting from 2014.
The annual trilateral Ministerial Conference on Culture was firstly launched in 2007. The Gwangju meeting is the fifth round of this series, and the last round of this meeting was held in Shanghai, China in May 2012.
1.Which of the following information is True according to the text?
A. The 5th China-Japan-South Korea Ministerial Conference on Culture was held on Sunday.
B. The 5th China-Japan-South Korea Ministerial Conference on Culture is aimed at promoting the cultural prosperity of West Asia.
C. Yoo Jinryong, Minister of Culture, Science, Technology and Tourism of Korea attended the meeting.
D. GWANGJU is a South Korean city that has a history of more than 2,000 years.
2.The underlined phrase “seeking a greater say”in Paragraph 3 probably means ________.
A. looking for more chances to speak Asian languages
B. trying to get greater power or right of acting or deciding
C. attempting to take up more space in the world
D. getting more time to set a good example to others
3.This text mainly tells us ________.
A. three Asian leaders meet each other to discuss economic problems
B. how the program of “East Asia City of Culture”came into being
C. three Asian countries agree to promote cultural prosperity of East Asia
D. the trilateral Ministerial Conference on Culture firstly began in 2007
4.We can know from the text that ________.
A. the fourth Ministerial Conference on Culture was held in GWANGJU
B. the trilateral Ministerial Conference on Culture is held once a year
C. the Ministerial Conference on Culture has never been held in China
D. no changes were made about the forms of activities to be held in the future
高三英语阅读理解中等难度题查看答案及解析
—What do you think made the 92nd Academy Awards so special?
—________Parasite from South Korea won a total of four Oscars.
A.Because B.What C.That D.Whether
高三英语单项填空中等难度题查看答案及解析
Scientists are trying to make the deserts into good land again. They want to bring water to the deserts， so people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming desert all the time. Scientists may not be able to change the desert in time.
Why is more and more land becoming desert？Scientists think that people make deserts. People are doing bad things to the earth.
Some places on the earth don’t get much rain. But they still don’t become deserts. This is because some green plants are growing there. Small green plants and grass are very important to dry places. Plants don’t let the sun make the earth even drier. Plants do not let the wind blow the dirt away. When a bit of rain falls，the plants hold the water. Without plants，the land can become desert more easily.
1.Deserts ＿＿＿＿＿＿＿＿ .
| A．never have any plants or animals in them |
| B．can all be turned into good land before long |
| C．are becoming smaller and smaller |
| D．get very little rain |
2.Small green plants are very important to dry places because ＿＿＿＿＿＿.
| A．they don’t let the sun make the earth even drier |
| B．they don’t let the wind blow the soil away |
| C．they hold water |
| D．All of the above. |
3.Land is becoming desert little by little because ＿＿＿＿＿＿.
| A．plants can’t grow there |
| B．there is not enough rain |
| C．people haven’t done what scientists wish them to do |
| D．scientists know little about the deserts |
4.After reading this passage， we learn that ＿＿＿＿＿＿＿＿.
| A．plants can keep dry land from becoming desert |
| B．it is good to get rid of the grass in the deserts |
| C．all places without much rain will become deserts |
| D．it is better to grow crops on dry land than to cut them |
高三英语阅读理解中等难度题查看答案及解析
Scientists are trying to save Puerto Rico’s endangered Amazon parrots after Hurricane Maria destroyed the birds’ habitats and food sources(来源).
El Yunque is a large national forest on the eastern part of Puerto Rico. Just two of the 56 wild parrots that once lived there survived Maria, the Category-4 storm that struck Puerto Rico in September 2017. Scientists report other forests have seen great drops in parrot populations as well.
In the 1800s, there were more than a million of the bright green parrots living in the wild in Puerto Rico. By the 1970s, the number was down to just 13 birds after years of forest clearing.
A special program was started in 1972 to help increase the parrot population, which led to the creation of three breeding(繁殖) centers. Just weeks before Hurricane Maria hit, scientists counted 56 wild parrots at El Yunque. That was the highest number in the program’s history. Scientists say that even though several parrots have been born in captivity(笼养) and in the wild since Maria, the species is still in danger.
The Puerto Rican Amazon is the island’s only remaining native parrot. More than 460 of the birds are kept inside the breeding centers at El Yunque and the Rio Abajo forest. Scientists have not released(释放) any of the birds since Hurricane Maria. A third breeding center, in a forest in the western area of Maricao, has not been in operation since the storm.
Scientists are considering whether to catch some of the remaining wild parrots and put them in the same cage as the birds that are set to be released. This way, the captive birds can learn from the wild birds how to survive in the forests. Another consideration is to release some captive parrots in Maricao, which was not as heavily damaged by Maria.
1.Why has the parrot population greatly decreased in the past 200 years?
A. Because of Hurricane Maria.
B. Because of too much hunting.
C. Because of the loss of forests.
D. Because of lack of breeding centers.
2.Which of the following is true about Hurricane Maria?
A. It killed 56 wild parrots at El Yunque.
B. It greatly affected parrots in captivity.
C. It reduced the number of wild parrots.
D. It led to the creation of three breeding centers.
3.What can we infer about Amazon parrots in captivity?
A. They have the highest number in the history.
B. They have been released since Hurricane Maria.
C. They are used to living in the wild.
D. They are larger in number than those in the wild.
4.What is the best title for the text?
A. Scientists Work to Save Puerto Rican Parrots.
B. Amazon Parrots are in Danger of Disappearing.
C. A Special Program Helps Increase the Parrot Population.
D. Hurricane Maria Reduced the Number of Amazon Parrots.
高三英语阅读理解困难题查看答案及解析
Can you imagine printing food? Some scientists are trying to revolutionize the dining experience by doing this. They hope that having a 3D printer in the kitchen will become as commonplace as the microwave. Scientists say that they are easy to use: you simply have to select a recipe and put the raw food "inks" into the printer. You can also change the instructions to make the food exactly how you want it. This means that it would be very quick and easy to create tasty and nutritious meals.
They say that if people used 3D printers to create meals there would be less need for traditional growing, transporting and packaging processes as food production would be a lot easier. For example, alternative ingredients (原料) such as proteins from insects could be changed into tasty products. And as is known, those traditional activities are not beneficial to our surroundings.
This technology could also help people who suffer from dysphagia (a swallowing disorder). The patients could program the printer and softer versions would be made so that they would not have trouble swallowing them.
However, some people think that using 3D-printed foods would be a disaster. It could take away many jobs, including those for growing, transporting and packaging food. Imagine a world where there was no need for farming or growing crops and the same tastes could be printed from a raw "food ink". Likewise, traditional cafes and restaurants might lose business. Also, there are concerns about the nutritional value of printed food: is it really possible to get the nutrients we need from food-based inks?
What's more, cooking and eating together with family and friends has long been a traditional and enjoyable activity. It is hard to imagine a world where the pastime of cooking is dead and meals can be created at the touch of a button.
1.What do scientists think of 3D food printing?
A. It is cheap to use it. B. It is environment-friendly.
C. It is advancing quickly. D. It needs improving.
2.What does the underlined part in Paragraph 3 refer to?
A. The printed foods. B. Their favorite foods.
C. The more nutritious foods. D. The more tasty foods.
3.What can we infer about the printed foods from Paragraph 4?
A. Their raw "food inks" are more nutritional.
B. People would get more jobs produced by them.
C. People need more evidence about their nutrition.
D. They would be bought in traditional restaurants.
4.What is the best title for the text?
A. The growth of 3D food printing B. The future of 3D food printing
C. The 3D food printing business D. The two sides of 3D food printing
高三英语阅读理解中等难度题查看答案及解析
--- The news that the scientists in China are trying the ways to reduce the fog and haze was? ---- Top notch! Never have I seen _____ before。
A. a better one B. a worse one
C. the best one D. the worst one
高三英语单项填空中等难度题查看答案及解析
Scientists are trying to develop a special material, ________ they will make use of in
spacecraft.
A. it B. one C. that D. what
高三英语单项填空中等难度题查看答案及解析
Robot teachers are now very popular with pupils in some primary schools in South Korea. Compared with human teachers, the robot teachers are1.(patient). They never get angry and are always kind to the students. That's2.the children can always get on well with their robot teachers.
English-teaching robots3.(send) to three primary schools for eight weeks last December.4.(equip) with a microphone and video camera, the robots teach students as teachers. Researchers found that the English-teaching robots helped raise students’ interests in the language and build up their5.(confident). More and more students came to like studying and they got better grades in exams. Meanwhile, other robot teachers,6.can teach math, science and art, have also been developed.
Many people think these robot teachers should be used7.faraway village schools so that the children there can also receive a good education.8.(give) rural school children more learning chances, the South Korean government has expressed great interest in9.(develop) these robots. No doubt there will be more and more robot teachers working with students. Perhaps they will10.(complete) replace human teachers one day in the future. Who knows?
高三英语语法填空简单题查看答案及解析