We can video chat with astronauts aboard the International Space Station and watch live footage from the frozen heights of Everest. But communicating with a submarine (潜艇）or a diver is not so easy. The lack of practical methods for sharing data between underwater and airborne devices has long been a frustration for scientists. The difficulty stems from the fact that radio signals work perfectly in air travel but poorly in water. Sonar (声呐）signals used by underwater sensors reflect off the surface of the water rather than reaching the air.
Now，researchers at MIT have developed a method with the potential to revolutionize underwater communication. “What we’ve shown is that it’s actually feasible to communicate from underwater to the air," says Fadel Adib，a professor at MJT’ s Media Lab，who led the research.
The MIT researchers designed a system that uses an underwater machine to send sonar signals to the surface, making vibrations (震动)corresponding to the ls and Os of the data. A surface receiver then reads and decodes these tiny vibrations. The researchers call the system TARF. It has any number of potential real-world uses, Adib says. It could be used to find downed planes underwater by reading signals from sonar devices in a plane' s black box and it could allow submarines to communicate with the surface.
Right now the technology is low-resolution. The initial study was conducted in the MIT swimming pool at maximum depths of around 11 or 12 feet. The next steps for the researchers are to see if TARF is workable at much greater depths and under varying conditions—high waves, storms， schools of fish. They also want to see if they can make the technology work in the other direction— air to water.
If the technology proves successful in real-world conditions, expect “texting while diving” to be the latest underwater fashion.
1.What does the author mainly talk about in Paragraph 1?
A. The future of video chat underwater and in air.
B. The frustrations of developing underwater devices.
C. The difficulty of communication from water to air.
D. The current situation of communicating with a submarine.
2.What does the underlined word “feasible” mean?
A. Achievable. B. Convenient.
C. Changeable. D. Alternative.
3.What do we know about TARF?
A. It is widely used to find downed planes.
B. It can work well at great depths underwater.
C. It is an underwater machine that sends signals.
D. It can send，receive and read signals from underwater.
4.What is the best title for the text?
A. The Real-world Uses of Sonar Technology
B. Full Water-to-air Communication Closer to Reality
C. A Breakthrough in the Application of Video Chat
D. TARF Becoming a New Means of Communication
Have you ever heard of agritourism where you can experience farm life? If not, Dr. Cindy Ayers-Elliott will tell you the real story of Foot Print Farms.
The original concept of building Foot Print Farms was simple. When Ayers-Elliott returned to her hometown after graduation，she didn' t have to look any further than her state' s alarming health statistics to find a mission. Everywhere she turned, there were reports of high blood pressure, diabetes, obesity and heart disease. “The problem was already identified." explains Ayers-Elliott. “Too many Mississippians were seriously unhealthy and it didn’t take research to see that. And many of the state' s greatest health challenges could directly result from poor diet. ”
These days，Foot Print Farms, which started with a few raised beds of herbs and vegetables, is making fresh, naturally grown food. "When speaking of the key to my success，the co-op model works because we share the work and rewards，” notes Ayers-Elliott. “ A perfect example is the Wingfield High School football team. To earn the money for equipment and other items, players committed to working five hours a week on the farm，and by the end of the summer they had produced 1，000 melons and the profits from their sales helped to buy weights，T-shirts，sweat suits and pregame meals. But the lessons they learned about the rewards of hard work and working together to accomplish something were even more valuable products of their efforts. ”
"It' s a model that can easily be learned in other places and I' m looking forward to seeing some of our current partners do just that——to take what they have learned here and spin it off in other communities,"Ayers-Elliott remarks. She is now looking forward to developing an agritourism aspect to the farm, where visitors can experience farm life, learn new skills and take with them seeds of inspiration they can sow in their own communities when they return home.
1.What made Ayers-Elliott set up Foot Print Farms?
A. The problems faced by local farmers.
B. Her further research into heart disease.
C. The failure of her career after graduation.
D. The health state of people in her hometown.
2.Why does the author take the football team as an example?
A. To advocate the concept of independence.
B. To stress the importance of teamwork.
C. To support the idea of co-op model.
D. To explore the key to success.
3.What is Ayers-Elliott' s attitude towards the future of Foot Print Farms?
A. Optimistic. B. Skeptical.
C. Cautious. D. Ambiguous.
4.What is the main idea of the text?
A. Naturally grown food benefits people’s health.
B. Food Print Farms is making a difference in Mississippi.
C. Ayers-Elliott encourages people to experience farm
D. Agritourism is becoming increasingly popular in America.
Created in 1998 by Casey and Shelley Black， the Northern Lights Wildlife Wolf Center focuses on not only rescuing young abandoned wolves but educating the public． Unlike other centers， you can actually walk with the wolves and have exciting， hands﹣on interaction with them here． And so， we gathered one late winter morning to learn， prepare and walk．
Scrappy and Flora，our wolves that day，were brought to the center when only a few days old． "They lived in the house with us for the first several months． We treated them like human babies， fed them and slept with them，" said Shelley． So， they are totally used to people． However， these are wild animals． For that reason， Shelley and Casey explained， the walk is totally on the wolf's terms． "We don't approach them， but if they come up to us， we can touch them． "
With all this in mind， we headed for the woods． We were walking on a logging road when suddenly，Flora， all 60 pounds of her，hurried up to me and raised up on her legs． She was almost as tall as me． As she leaned in， put her huge muddy paws on my shoulders and sniffed my face， apparently she was saying hello in wolf talk．
We walked farther， maybe half a mile， while Scrappy and Flora dashed in and out of the woods stopping to occasionally roll in the snow，dig for this or that and just play． Then we all headed into the trees to a picturesque stream where the wolves splashed，drank and had a great time．
One could point out that this whole adventure was staged and quite artificial． But the purpose， Casey and Shelley said，is to explain the wolves' place in the environment and，primarily，to let people know wolves don' t have to be universally feared﹣they really don' t hide secretly in the woods just waiting to eat people，but they' d rather avoid people，for the most part．
1.How is the Northern Lights Wildlife Wolf Center different from others？
A. It trains and educates wild wolves．
B. It aims to rescue young abandoned wolves．
C. It raises wolves for commercial purposes．
D. It allows visitors to take a walk with wolves．
2.What can be inferred from Shelley and Casey's explanation in Paragraph 2？
A. The walk can be potentially dangerous．
B. The wolves have lost all their wildness．
C. People should get close to the wolves actively．
D. The wolves can read people's mind like human babies．
3.Why did Flora behave like that when she saw the author on the logging road？
A. To express curiosity．
B. To show friendliness．
C. To attract attention．
D. To seek companionship．
4.Why do Casey and Shelley organize such an adventure？
A. To advertise the center．
B. To publicize wolf hunting．
C. To promote environmental protection．
D. To clarify some conventional views of wolves．
Panama City， Panama
For beach vacations that get you out of town and invite you and your family to dive into culture， consider a trip to Panama City． Here，you will enjoy beaches and city exploring． Book your stay at the Westin Playa Bonita， where you can book a room starting at ﹩222 a night． There are various programs，including beach Olympics， stargazing （天体观察）and Spanish lessons．
Jupiter， Florida
This place offers you quality time you can spend with your loved ones． Book your stay at Jupiter Beach Resort & Spa， with rates for a family of four starting at ﹩207 a night． Here， you can shoot baskets at the basketball courts，take a dip in the pool or teach your children beach yoga．
San Diego，California
The West Coast is a great spot for cheap beach vacations， so tell your family to pack their bags for a visit to San Diego． A cheap ﹩10 Uber ride from the airport will have you pulling up the Kona Kai Resort & Spa． Here，a family of four can stay in a Deluxe Guest Room starting at ﹩159 per night． Your kids can practice cannonballs at the pool after a visit to the world﹣famous San Diego Zoo．
Kihei Maui， Hawaii
For West Coasters who are growing bored with their backyard， fly to the islands of Hawaii． Stay at the Aston at the Maui Banyan， with a charge of ﹩179 a night for a family of four． Here，you'll witness some of the best sunsets of your life while your kids splash （戏水）in the Pacific， And if you're set on cooking a fancy meal， you'll enjoy suites that come with a full kitchen．
1.Which of the following charges you least a night？
A. The Aston at the Maui Banyan．
B. The Westin Playa Bonita．
C. The Kona Kai Resort & Spa．
D. Jupiter Beach Resort & Spa．
2.What can you do at the Aston at the Maui Banyan？
A. Admire beautiful sunsets．
B. Visit a world﹣famous zoo．
C. Observe fantastic stars．
D. Play some beach sports．
3.What is the common feature of the four destinations？
A. They all offer rooms with a full kitchen．
B. They are all intended for family trips．
C. They all pick up visitors from the airport．
D. They all provide bike riding on the beach．
近期，某校组织高三学生进行了一场讨论。主题是:高三年级要不要集中进行晚自习。根据下图提供的信息，写一篇英语短文，客观地介绍一下讨论的情况，注意要涵盖所有要点。
注意:
1. 词数不少于100(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。
晚自习evening self-study
Recently there was a heated discussion among Senior 3 students in our school.
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Yours sincerely,
Li Hua
假定英语课上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仅限一词；
2. 只允许修改10处，多者(从第11处起)不计分。
Our class joined in a meaningful activity during the winter vacation. First, we went to visit the old lady who lived all alone. Some chatted with her but others helped do a thorough cleaning for us. When the work was done, the house looked real neat and tidy. Then we went to the sport center, where all equipment needed polished. We set out to work at once. Everything was dust-free at no time. Having done all this, we saw a pleasant community than before. Tiring as we were, we felt happy as all of our work was paid off.
