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
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Shangri-La Hotel Singapore Singapore 22 Orange Grove Road, 258350 General ● Air-conditioned public areas ● Ballrooms ● Bar ● Coffee shop or café ● Elevator/lift ● Gift shops ● Restaurants in hotel ● Outdoor swimming pool ● Free Internet access Check-in time: 2:00 pm Check-out time: noon Pets not allowed |
Swissotel Merchant Court Singapore 20 Merchant Road, 058281 General ● Air-conditioned public areas ● Ballrooms ● Bar ● Coffee shop or café ● Elevator/lift ● Restaurants in hotel ● Outdoor swimming pool ● Television in lobby Cheek-in time: 3:00 pm Check-out time: noon Pets not allowed |
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Royal Plaza On Scotts Singapore 25 Scotts Road, Orchard, 228220 General ● Air-conditioned public areas ● Ballrooms ● Bar ● Elevator/lift ● Gift shops ● Restaurants in hotel ● Smoke-free environment ● Outdoor swimming pool Check-in time: 2:00 pm Check-out time: noon Pets not allowed |
Landmark Village Hotel Singapore 390 Victoria Street, 188061 General ● Air-conditioned public areas ● Ballrooms ● Bar ● Coffee shop or café ● Elevator/lift ● Restaurants in hotel ● Outdoor swimming pool Check-in time: 2:00 pm Check-out time: noon Pets allowed |
1.Which of the following can you do in every hotel mentioned above?
A．You can have a swim. B．You can have free coffee.
C．You can check in at the same time. D．You can’t bring your pet with you.
2.In which hotel can you buy things on the Internet?
A．Shangri-La Hotel Singapore B．Swissotel Merchant Court
C．Royal Plaza On Scotts D．Landmark Village Hotel
3.The purpose of the passage is ________.
A．to make people enjoy their trips B．to persuade people to visit Singapore
C．to introduce four hotels in Singapore D．to improve the hotel services
When looking back at the scary situation that happened to him on Saturday, Patrick Canney said he couldn’t still believe that it was true. It was a situation that could have ended with a tragedy for Patrick, his father and his sister. But it didn’t really happen thanks to Patrick.
That morning, Patrick’s father was driving down busy Interstate 95 in Peabody, Massachusetts. The car started going really slowly, which seized Patrick’s attention. And then he realized that something was wrong. At that point, Patrick found his father was having a seizure （中风）.
“It was really scary,” he said. “It was unlike anything that had ever really happened to me.” But Patrick didn’t act scared. He took control of the situation and got behind the wheel of the SUV. He turned the key off and pulled the car over to the breakdown lane （车道）. He then stopped the SUV, grabbed a cell phone out of his dad’s pocket and called 911 for help.
Patrick’s 9-year-old sister was in the SUV, too. He told his little sister not to worry about it. Then he opened the door and stood right next to the guard rail. Thanks to Patrick’s description of their location during the 911 call, Massachusetts State Police were able to locate the Canneys within minutes -- and get them all to safety.
“A 12-year-old boy’s clear thinking and decisive action actually saved this family from a tragedy,” said state police spokesman David. “That’s Patrick. He is cool and collected. I couldn’t imagine what would be the result if he were panicked （惊慌失措）.”
Patrick’s father was expected to recover fully from the seizure. And thanks to Patrick, all of the Canneys are still alive. “The word hero may be overused in our society,” said David. “But Patrick is surely that -- and then some.”
1.As soon as he found his father had a seizure, Patrick ________.
A．told his sister not to worry B．called the police for help at once
C．tried his best to save his father D．managed to take control of the car
2.The underlined word “collected” in Paragraph 5 means “_________”.
A．confused B．positive C．calm D．serious
3.What did David think of Patrick?
A．Patrick should learn from real heroes in society.
B．Patrick was a cool boy who matched the word hero.
C．Patrick should be rewarded for his behavior.
D．Patrick should protect his family carefully in the future.
4.Which of the-following best expresses the main idea of the passage?
A．A kid made every effort to survive in a car crash.
B．A kid turned into a lifesaver after his father was ill.
C．A kid learned how to become a hero by using his wisdom.
D．A kid saved his sister when they drove on a highway.
Monty Roberts often let me use his house to hold fund-raising events to raise money for young people in need.
The last time I was there he 36 me to a group of people by saying, “I want tell you 37 I let Jack use my house. It 38 a story about a young man. When he was a high school student, he was asked to write a paper about his 39 .”
“That night be wrote a seven-page paper 40 his goal of someday owning a horse ranch （大牧场）. He wrote about his dream in great 41 and he even drew a picture of a 200-acre ranch, showing the 42 of all the buildings, the stables（马厩）and the track. Then he drew a detailed plan for a 4,000-square-foot house that would 43 on a 200-acre ranch.”
“When he received his paper, he found that there was a big red ‘F’ on the front page with a note 44 , ‘see me after class.’”
“The boy went to see the teacher after class and asked, ‘Why did I receive an F?’”
“The teacher said, ‘This is a（an） 45 dream for a young boy like you. If you __46 this paper with a more realistic goal, I will reconsider your 47 .’”
“Finally, after a week, the boy handed in the same paper, making no 48 . He stated, ‘You can 49 the F and I’ll keep my dream.’”
“I told you this story because you are sitting in my 4,000-square-foot 50 in the middle of my 200-acre ranch. I still have that school 51 .”
He added, “That 52 teacher came to my ranch. Before leaving, he said, ‘During those years I 53 a lot of kids’ dreams. 54 , you didn’t give up yours.
Don’t let anyone steal your dream. Follow your 55 , no matter what.
1. A．warned B．informed C．helped D．introduced
2. A．why B．when C．how D．where
3. A．breaks away from B．gets along with
C．goes back to D．is occupied with
4. A．feeling B．dream C．difficulty D．contribution
5. A．expecting B．drawing C．imagining D．describing
6. A．strength B．detail C．surprise D．courage
7. A．owner B．construction C．locations D．prices
8. A．sit B．cover C．rise D．remain
9. A．writing B．expressing C．suggesting D．reading
10. A．unrealistic B．wonderful C．fantastic D．disappointing
11. A．exchange B．check C．rewrite D．treat
12. A．goal B．grade C．future D．behavior
13. A．senses B．changes C．comments D．excuses
14. A．keep B．follow C．continue D．choose
15. A．field B．ranch C．office D．house
16. A．building B．address C．story D．paper
17. A．same B．kind C．single D．famous
18. A．tested B．asked C．stole D．missed
19. A．Therefore B．Fortunately C．Surprisingly D．Generally
20. A．advice B．heart C．trend D．statement
When it comes to a foreign language, he is not ________ quick a learner as his brother.
A．very B．too C．so D．rather
假设你是李华，你班同学李阳和赵民发生争吵，关系很紧张。原因是李阳晚上在寝室打手机，赵民觉得这影响了他的休息。请你结合此事，并根据以下提示，用英语写一篇短文，向学校英文报“Happy Teens”专栏投稿。
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简要描述事情经过 |
在寝室打手机，影响休息 |
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分析冲突原因 |
遇事不冷静 .......... |
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谈一下避免冲突办法 |
根据自己经历感想，提出至少两种 |
1、词数100左右。开头已经写好，不计入总词数。
2、作文中不得提及有关考生个人身份的任何信息，如校名、人名等。
Conflicts with others are common in everyday life. ____________________________________
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