Researchers with the University of Cambridge say they have the first real evidence of a new state of matter, some 40 years after it was first theorized.

Known as “quantum spin liquid(量子旋轉(zhuǎn)水)”, the matter state causes normally unbreakable electrons to break into pieces called “Majorana fermions.” These fermions are an important discovery. Physicists believe the material is vital to further develop quantum computing. Computers employing Majorana femuons would be able to carry out calculations beyond the scale of modern computers quickly, they say.

Quantum spin liquid explains some of the eccentric behaviors inside magnetic(磁性的) materials. In these materials, the electrons should behave like small bar magnets, all adjusting towards magnetic north when a material is cooled. But not all magnetic materials do this—if the material contains quantum spin liquid, the electrons don’t all line up and become involved.

“Until recently, we didn’t even know what the experimental fingerprints of a quantum spin liquid would look like,” researcher Dr.Dmitry Kovrizhin says. “That created a challenge for the researchers, so they decided to employ neutron scattering(神經(jīng)掃描) techniques to look for evidence of break”. What they found surprised them. The features matched nearly exactly with quantum spin liquid models theorized by physicist Phil Anderson in 1973. The results of their breakthrough were then published in the scientific journal Nature Materials on Monday.

Don’t get too excited just yet on its applications, though. Kovirzhin’s work is only the beginning and as we’ve seen with quantum computing there is a lot of work to be done. But it’s still exciting regardless.

“It’s an important step for our understanding of quantum matter,” Kovrizhin says. “It’s fun to have another new quantum state that we’ve never seen before—it presents us with new possibilities to try new things.”

1.What can we learn about “Majorana fermion” according to Paragraph 2?

A. It is an important discovery 40 years ago.

B. It is a surprising theory raised by Phil Anderson.

C. It is a key piece in developing quantum computer.

D. It is an unbreakable electrons employing computer.

2.Which of the following can best replace the underlined word “eccentric” in Paragraph 3?

A. Strange. B. Complex. C. Permanent. D. Obvious.

3.How did the researchers make the breakthrough?

A. By adjusting magnetic materials.

B. By using neutron scattering techniques.

C. By repeating maths calculations.

D. By changing electronic structure.

4.What is the author’s tone about the future of quantum matter?

A. Negative. B. Doubtful. C. Indifferent. D. Optimistic.

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)源：2016-2017學(xué)年廣東省高二第二學(xué)期第一次月考英語(yǔ)試卷（解析版） 題型：單詞拼寫

He would not have got injured if he had ______________ (服從，順從) the traffic rule.

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2017屆安徽省江南十校高三3月聯(lián)考英語(yǔ)試卷（解析版） 題型：短文填空

The Dutch are used to living in a country which is always exposed to dangers of deadly floods. A country with a half of its land below sea level cannot afford 1.(ignore)the problem of rising sea level, and Holland, which already has spent about U.S. $2.5 trillion (萬(wàn)億)on flood2.(prevent), plans to invest(投資)more over the next century. Life in these challenging3.(circumstance) has inspired the Dutch to develop many excellent methods of 4.(fight)floods. Thanks to the skill of Dutch engineers, flooding in Holland is rarely widespread, and is instead limited5.certain areas of the country. Two such areas are the valleys of the Rhine and the Meuse Rivers. In spite of large flood wall, these rivers regularly flood the surrounding areas. During dry times, however, those areas are perfectly6.(pleasure) to live in. one solution7.(develop)now is a type of house that seems normal in every day, except that it can float during times of high water rather than8.(simple) sink beneath the waves as normal houses would. Groups of houses would form floating neighborhoods in 9.people could live together during times of high water, temporarily getting around by boat10.the flood ends.

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：寧夏銀川市2017屆高三下學(xué)期第一次模擬考試英語(yǔ)試卷 題型：短文改錯(cuò)

假定英語(yǔ)課上老師要求同桌之間交換修改作文，請(qǐng)你修改你同桌寫的以下作文。文中共有10處語(yǔ)言錯(cuò)誤，每句中最多有兩處，每處錯(cuò)誤僅涉及一個(gè)單詞的增加、刪除或修改。

增加：在缺詞處加一個(gè)漏字符號(hào)（∧），并在其下面寫出該加的詞。

刪除：把多余的詞用斜線（\）劃掉。

修改：在錯(cuò)的詞下劃一橫線，并在該詞下面寫出修改后的詞。

注意：1.每處錯(cuò)誤及其修改均限一詞。

2.只允許修改10處，多者（從第11處起）不計(jì)分。

Every boy and every girl are eager for success. But what can we succeed in life? Here are my opinions:

First, we must be friendly and kindly. It allows us to make friends but survive wherever we are. Second, we must set a goal, which motivates us to pursue our dreams. Third, it’s better to believe in us. Only with self-confidence we realize our goals. Fourth, we should develop good characters, such as a strong will and diligence, because good qualities help us to hold on to our dreams since we get into the trouble.

As far as I’m concerning, success belongs to those who keep on trying. So let’s take actions now!

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：山東省菏澤市2017屆高三一模英語(yǔ)試卷（有答案） 題型：書面表達(dá)

有沒有想過(guò)給自己寫信，尤其是給將來(lái)的自己寫信。請(qǐng)用英語(yǔ)給五年后的自己寫封信，信的內(nèi)容包括以下三個(gè)方面：

1.寫信的目的；

2.給五年后的你一些忠告；

3.如何看待五年后的你。

注意：

1.詞數(shù)100左右；

2.可以適當(dāng)增加細(xì)節(jié)，以使行文連貫；

3.開頭和結(jié)尾已為你寫好，不計(jì)入總詞數(shù)。

Dear myself,

Yours,

Me

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：河南省洛陽(yáng)市2017屆高三第二次統(tǒng)一考試（3月）英語(yǔ)（有答案） 題型：短文改錯(cuò)

假定英語(yǔ)課上老師要求同桌之間交換修改作文，請(qǐng)你修改你同桌寫的以下作文。文中共有10處語(yǔ)言錯(cuò)誤，每句中最多有兩處。每處錯(cuò)誤僅涉及一個(gè)單詞的增加、刪除或修改。

增加：在缺詞處加一個(gè)漏字符號(hào)(∧)，并在其下面寫出該加的詞。

刪除：把多余的詞用斜線(＼)劃掉。

修改：在錯(cuò)的詞下劃一橫線，并在該詞下面寫出修改后的詞。

注意：1．每處錯(cuò)誤及其修改均僅限一詞；

2．只允許修改10處，多者(從第11處起)不計(jì)分。

When I was a kid, my father and mother were made me join a tennis club in the center of our city. Every day both my parent would take me to club after school. I played tennis ,ate snacks and did my homework here. It was basically my second family. A woman whose name was Li Li, my first private coach, was as a mother to us. She not only taught me everything that I know about what to play tennis, but treats me well. She was kind or always trained me with great patient. In my heart, she was the best coach in our city.

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：河南省洛陽(yáng)市2017屆高三第二次統(tǒng)一考試（3月）英語(yǔ)（有答案） 題型：閱讀理解

Protection Publications

CUSTOMER HEALTH: A GUIDE TO INTELLIGENT DECISIONS

Eight softcover edition of leading college text covering all aspects of basic health strategy(策略) for consumers. Includes much information on food fashion and “alternative methods”. Thoroughly referenced. By Stephen Barrett, M. D. , William M. London, Ed. D., Robert S. Baratz, M. D. , D. D. S. , Ph. D. , and Manfred Kroger, Ph. D. 608 pages, $23.00

CHIROPRACTIC(手療法): THE CREATEST HOAX(騙局)OF THE CENTURY?

L. A. Chotkowski, M. D. , FACP, describes discoveries made during his half-century of medical practice. Includes reports of cases; the author’s observations at New York Chiropractic College, a chiropractic office, and a chiropractic lecture; and details of critical reports in the media. Second edition, softcover, 208 pages, $15.

THE WHOLE TOOTH

The fundamental guide to protecting your dental health and your pocketbook. Covers preventive care, finding a good dentist, dental restoring, cosmetic dentistry, dental quackery (治療) and fraud(假牙), and dental insurance programs, including managed care. By Marvin J. Schissel, D. D. S. , and John E. Dodes, D. D. S. Softcover, 284 pages, $10.

QUACKERY AND YOU

The 32-page softcover brochure with special viewpoints by William Jarvis, Ph. D. , suitable for waiting rooms. $1.

To above prices, please add $3 for first book and $1 for each additional book for postage & handling. Foreign countries add $5 per book. Send orders to Quackwatch, P. O. Box 1747, Allen Avenue, NY 18105. The checks must be in US dollars. We cannot process credit card orders. Please use our order form from amazon.com and include your email address.

1.What do the four books have in common?

A. The contents. B. The means of cover packing.

C. The prices. D. The dates of publication.

2.What can you do to search for more information about the books?

A. Buy the brochure. B. Write to the author.

C. Telephone the sellers. D. Visit amazon.com.

3.How should a Canadian pay if he wants to buy all the four books?

A. Pay $69 in all. B. Pay $65 in total.

C. Pay for them by credit card. D. Pay for them in Canadian dollars.

4.For whom is QUACKERY AND YOU designed?

A. Those who order some medicine.

B. Those who hole special opinions.

C. Those waiting to see the doctor.

D. Those studying the science of medicine.

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：遼寧省鞍山市2017屆高三3月月考英語(yǔ)試卷（有答案） 題型：閱讀理解

Donald John Trump, born on June 14, 1946, is an American businessman. As the Republic Party’s nominee for president in the 2016 election, he defeated Hillary Clinton in the general election on November 8, 2016.

Trump is the chairman and president of The Trump Organization, which is the principal holding company for his real estate (Trump is the chairman and president of The Trump Organization, which is the principal holding company for his real estate(房地產(chǎn)) ventures and other business interests. During his career, Trump has built office towers, hotels, casinos, golf courses, and other branded facilities worldwide.

Trump was born and raised in New York City and received a bachelor’s degree in economics from the Wharton School of the University of Pennsylvania in 1968. In 1971 he was given control of his father Fred Trump’s real estate and construction firm and later renamed it The Trump Organization. Trump has appeared at the Moss USA pageants, which he owned from 1996 to 2015, and has made cameo(配角) appearances in films and television series. He sought the Reform Party presidential nomination(提名) in 2000, but withdrew before voting began. He hosted and co-produced The Apprentice, a reality television series on NBC, from 2004 to 2015. As of 2016, he was listed by Forbes as the 324th wealthiest person in the world, and 156th in the United States.

In June 2015, Trump announced his candidacy(候選人資格) for president as a Republican and quickly emerged as the front runner for his party’s nomination. In May 2016, his remaining Republican rivals suspended(暫停) their campaigns, and in July he was formally nominated for president at the 2016 Republican National Convention. Trump’s campaign has received unprecedented media coverage and international attention. Many of his statements in interviews, on Twitter, and at campaign rallies(集會(huì)) have been controversial or false. Several rallies during the primaries were accompanied by protests or riots.

1.What do we know about Donald John Trump?

A. His career is limited in America.

B. It was a surprise that he defeated Hillary Clinton.

C. His business has expanded all over the world.

D. His father was against him being a politician.

2.What’s the main idea of Paragraph 3?

A. Introduction to Trump’s life. B. Introduction to Trump’s family.

C. The secret of Trump’s success. D. Trump’s dream.

3.Which of the following is WRONG for Donald John Trump once?

A. He once acted as a leading actor in films.

B. He once worked as a host.

C. He owns a lot of money.

D. He majored in economics in university.

4.According to the last paragraph, we can conclude at the campaign ________.

A. Trump owed his success to his family

B. at a point all Americans protested against Trump

C. Trump had no Republican rivals

D. all people didn’t agree with the remarks Trump made

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：廣東省佛山市2016-2017學(xué)年高一上學(xué)期第二次大考英語(yǔ)試卷 題型：短文填空

閱讀下面材料，在空白處填入適當(dāng)?shù)膬?nèi)容（最多1個(gè)單詞）或括號(hào)內(nèi)單詞的正確形式。

One morning, I was waiting at the bus stop, worried about 1.(be) late for school. There were many people waiting at the bus stop, 2. some of them looked very anxious and 3.(disappoint). When the bus finally came, we all hurried on board. I got a place next 4. the window, so I had a good view of the sidewalk. A boy on a bike 5.(catch) my attention. He was riding beside the bus and waving his arms. I heard a passenger behind me shouting to the driver, but he refused 6. (stop) until we reached the next stop. Still, the boy kept 7.(ride). He was carrying something over his shoulder and shouting. Finally, when we came to the next stop, the boy ran up to the door of the bus, I heard an excited conversation. Then the driver stood up and asked, “8. anyone lose a suitcase at the last stop?” a woman on the bus shouted, “Oh, dear! It’s 9.(I).” She pushed her way to the driver and took the suitcase thankfully. Everyone on the bus began talking about what the boy had done, and the crowd of strangers 10.(sudden) became friendly to one another.

查看答案和解析>>

同步練習(xí)冊(cè)答案