Like most people, you have probably lost count of the number of perfect-looking shoes you have thrown away simply because the rubber soles (橡胶鞋底) are broken. In addition to the expense, it is also harmful to our environment. Now, thanks to a revolutionary self-healing 3-D printed rubber material, broken shoe soles may be a thing of the past.
The magical polymer (聚合物) is developed by the researchers at the University of Southern California’s (USC) and the University of Connecticut (UConn) . The team, led by USC Assistant Professor Qiming Wang, created it through a process called photopolymerization, which uses light to solidify the liquid used to create 3-D printed plastic. The researchers found that adding the right amount of oxidant (氧化剂) to the liquid allowed the 3-D polymer to heal (愈合) without slowing down the hardening process.
“When we gradually increase the oxidant, the self - healing behavior becomes stronger, but the photopolymerization behavior becomes weaker,” explained Wang. “There is competition between these two behaviors.”
The team, who published the findings in the journal NPG Asia Materials on February 1st,2019, state that the repair time can be reduced by increasing the room temperature. “If you just put a broken shoe on a bench at room temperature, the rubber will heal itself in six to eight hours,” Wang said. “If you apply heat at maybe 60℃, that expedites the healing process to about two hours.”
Given the material s huge potential, it is not surprising to hear that Wang and his team have been approached by several shoe-making companies eager to be the first to use the technology, which is still in the early stages. Once perfected, the scientists also hope to apply the technique to hard plastics that can be used to create self-healing toys, electronics, vehicle parts, and, if Wang has his way, even tires.
1.How do the researchers make 3-D printed plastic self- heal?
A.By changing the amount of light used.
B.By raising the temperature at which it is used.
C.By increasing the hardening speed of the liquid.
D.By adding the proper amount of oxidant to the liquid.
2.What can be inferred from the text?
A.The creation of 3-D printed plastic doesn’t need light.
B.The surrounding temperature determines the speed of healing.
C.Many shoe making companies got the right to use the technology.
D.Throwing away broken shoe soles has been a thing of the past.
3.What does the underlined word “expedites” mean?
A.Strengthens. B.Delays. C.Accelerates. D.Worsens.
4.Which of the following can be the best title of the text?
A.Self - healing shoes may be in our future.
B.3-D printing technology makes a difference.
C.Self - healing technology will serve many fields.
D.A revolution of rubber soles has changed our life.
A few years ago, a doctor gave a wrong prescription to a 9-year-old boy because he had accidentally clicked the next medicine listed in the drop-down menu. Unfortunately, the boy died.
Dr. Gidi Stein heard the story and felt forced to do something. “It was like killing someone with a spelling error. He just clicked on the wrong button…Stein said. “One would have thought there’d be some kind of spell-checker to prevent these terrible things from happening. But apparently this is not the case.”
Several things were immediately obvious to the 54-year-old Stein, who had previously studied computer science. “If you look at this problem from a bird’s eye view, there were so many places down the line where this decision could have been stopped-from the physician to the pharmacy (药房) even to the mother. All of them had all the relevant information to have the judgment that this was just the wrong drug for the wrong patient. For Stein, it represented a systematic failure.
Stein compared this with credit cards. “If you use your credit card in the daily routine over time, a pattern emerges of how we use our cards : the grocery store, the gas station in our local town. If your credit card would appear tomorrow in Zimbabwe, it would be unusual. The credit card company would call you and say, “‘Hey, was that you?’”
But nothing like that existed in the field of prescription drugs. So Stein set up a company called MedAware. He came up with a machine learning outliner detection system. In other words, he trained the computers to realize if a doctor accidentally prescribed the wrong medicine.
The system is already used in hospitals and doctor5 s offices. To date, MedAware has used their technology to help nearly six million patients in the United States and Israel.
1.What caused the boy’s death?
A.The doctor’s carelessness. B.The doctor’s poor medical skill.
C.The failure of the computer. D.The incomplete health care system.
2.How did Dr. Gidi Stein react to the boy’s death?
A.He was annoyed and put the blame on the doctor only.
B.He was regretful and tried to prevent similar accidents happening.
C.He was embarrassed and mistook it as a systematic failure.
D.He was confused and detected the mistakes in prescriptions himself.
3.What does Stein want to tell us by mentioning credit cards?
A.Credit cards are available for doctors’ prescriptions.
B.Instructions in using credit cards are offered to users.
C.The boy might have been saved with the technology like credit cards.
D.MedAware’s technology will benefit the patients in Zimbabwe.
4.It can be concluded from the text that ________.
A.MedAware’s technology helps doctors choose right medicine
B.MedAware’s technology checks the prescriptions doctors make out
C.Medical industry worldwide has enjoyed MedAware’s technology
D.The boy? s mother was not to blame for his death during the accident
The Oscar - winning 2013 musical Frozen, inspired by Hans Christian Andersen’s The Snow Queen, followed the tale of two princess sisters, Elsa and Anna. They were forced to grow up isolated from each other and the world because of Elsa’s potentially dangerous magic ability to control ice. The film earned an amazing $1.27 billion box office worldwide, and fans were so charmed by the characters-that they weren’t able to “Let It Go”, crazily calling for a sequel (续集).
Finally, Frozen II comes into its fans’ eyes. However, the beginning of Frozen II is not convincing, largely because it overturns much of the character development Anna and Elsa went through in the first movie. At the end of Frozen, Elsa had learned that her powers were a gift, and she had become confident and proud in using them. At the beginning of Frozen II, that confidence is gone.
Whatever technical advancements have been made in computer animation over the past six years aren’t readily apparent in Frozen II. It mostly has the same frosty look as the first film. A sea battle between Elsa and a glowing ice horse leaves the most striking impression on the audience.
The biggest failure? The music. In Frozen, even the throwaway songs enjoyed great popularity, let alone the theme song Let It Go. Returning composers Robert Lopez and Kristen Anderson-Lopez try to give Elsa two showstopping numbers: Into the Unknown and Show Yourself. But neither song reaches any emotional heights. (Never mind that there really isn’t a show to stop.)
Yes, Frozen II is a letdown to most audience, especially the fans of the original. It’s hard to see how the same team who made something so cool in 2013 could deliver something so-there’s no other word for it-lukewarm.
1.What do we know about the musical Frozen?
A.Its theme song didn’t reach fans’ heart.
B.It didn’t earn profit through its box office.
C.It was a big hit after it came into the market.
D.Its main characters lived together in their childhood.
2.What is the most impressive part of Frozen II?
A.A sea battle. B.Technical advancement.
C.A different beginning. D.The newly-created music.
3.What does the author think of the musical Frozen II?
A.Breathtaking. B.Disturbing.
C.Moving. D.Disappointing.
4.What type of writing is this text?
A.An announcement. B.A film review.
C.An official report. D.A show guide.
The Escape Surf School is in Newquay and has been teaching people to surf for over 15 years. As well as being one of the longest running UK Surf Schools, we are the only one of the schools in Newquay with a 35-year professional surfer as head coach (our very own Mike Young-Surf Guru!)
We love teaching complete beginners but we also teach intermediate and advanced coaching, offering outback, progressive lessons on a daily basis.
We are open 12 months of the year, 7 days a week, so if you want to learn to surf or improve your surfing, then look no further.
Surf Lessons
At the Escape Surf School, we are proud to specialize, not generalize. We offer lessons to whoever is interested, ranging from complete beginners to advanced and contest surfers. As well as offering surfing lessons, we also offer a variety of packages which include surfing and accommodation.
All lessons take place on Towan, Great Western or Fistral beach, all of which are less than 5 minutes’ walk from school. So we meet at the school, where we all change into wetsuits, and then head for the best beach.
Guided Prices
1 lesson-$65: Perfect for a beginner, taster session, or quick surfing fix!
Full day (2 lessons)-$90: Can be split over 2 days to really progress in your surfing.
Family lesson-$160: Have fun with the family in a private lesson with one of our professional coaches. (Price is based on 2 adults and 2 kids.)
One in One-$100: Experience private coaching with Pro Surfer.
Two on One-$140: Couples or friends, experience private surf coaching session, perfect to fast track your surfing and impress your partner! The prices include board and wetsuit (and boots or gloves if required), there are no hidden charges.
1.What makes the Escape Surf School unique?
A.Its history. B.Its lessons.
C.Its students. D.Its head coach.
2.How much will be paid if twin sisters want private lesson together?
A.$90. B.$100. C.$140. D.$160.
3.What can we learn about the Escape Surf School?
A.It welcomes learners at all levels. B.Learners should bring their own wetsuits.
C.It teaches surfing and swimming. D.Learners can get changed on the best beach.
假如你是李华，你的美国笔友Jane发来邮件，说她在当地“汉语桥 (Chinese Bridge)”比赛中琵琶(pipa)演奏和中文演讲均获第一名，下个月她将作为学生代表赴华参加汉语桥总决赛。请你给她写一封邮件，内容包括：
1. 表示热烈祝贺；
2. 提出赛前建议；
3. 期待早日见面。
注意：1. 词数100左右；
2. 可以适当增加细节，以使行文连贯。
Dear Jane,
______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Yours,
Li Hua
下列每个句子中有一处语言错误。每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: 每处错误及其修改均仅限一词。
1.The beautiful scenery of the town impressed me most for the first time I visited it.
2.Who is in charge of the project is to blame for the failure caused by carelessness.
3.If the police thought he was the most likely one, they couldn’t arrest him since they had no convincing proof.
4.The most important factor which contributes to success is what you do every single day.
5.It was at 11:00 that the business meeting finally came to the end.
6.Faced with the complicated situation, Tom had no alternative but turn to his friend for help.
7.Far from satisfying with his progress, Tom devoted himself entirely to writing.
8.The film adapted from a detective novel has received a positive respond from the audience.
9.There’s still some doubt that our demand for higher salaries will be taken seriously.
10.We presented Mr. Green with a Chinese knot, a gift giving to foreigners as a symbol of Chinese culture.
