The fact that your hair turns grey because of stress is nothing more than an old wives' tale. It's true that stress isn't good for you, but it's not going to turn you into a silver fox just yet. In fact, the answer comes from the cells in your hair. These are what decide the color and, eventually, the fade to grey.
Most of us start to notice our first grey hairs by the time we hit our thirties. A general rule to go by is that by the age of 50,half of the population will have lost the color in 50 percent of their hair.
But why does it happen? Firstly, we need to understand how hair gets its color.
Your hair is made up of cells called melanocytes(黑色素细胞) which produce pigments(色素) as they grow into the hair fiber. There are two different types of melanins: eumelanins and pheomelanins. The former produces black and brown pigments, while the latter produces red and yellow pigments. The exact amount of these pigments decides whether a person has black, brown, blonde or red hair.
As we age, the ability of the melanocytes to produce more pigments weakens. That's because our hair grows in different periods.
The growing period lasts between three and five years, after which our follicles(毛囊) turn off for about three months to rest and get ready to grow more hairs. This goes round and round and, after a time, our bodies aren't as good at producing new hairs.
Scientists are continuing to try and find ways to prevent greying hair. A team of scientists in France is working to try and stop the melanocytes from being damaged at the end of each hair cycle. They are trying to use a special enzyme(酶) to protect the cells from damage. If successful, it could lead the way for new products that keep our hair full of color for years to come.
1.The phrase “an old wives' tale” in Paragraph 1 probably mean________？
A.a wrong belief B.useful talk
C.a scientific rule D.helpful experience
2.What do we know about red hair?
A.It doesn't turn grey as people get older.
B.It contains more pheomelanin’s than eumelanin’s.
C.The amount of pigments in it doesn't change over time.
D.People with red hair have weaker ability to produce pigments.
3.What do the French scientists aim to do?
A.To repair damaged hair follicles.
B.To protect hair cells against damage.
C.To shorten the hair cycle to protect the hair.
D.To study the relationship between health and hair color.
4.What can we infer from the article?
A.Grey hair has nothing to do with stress.
B.Grey hair is a symbol of declining health.
C.It takes three months for new hair to grow.
D.The growth and color change of hair depend on cells.
A Lighter Touch
In recent years, superheroes such as Superman, Thor, Iron Man, and Black Panther have starred in film series with complex, serious storylines about the end of the universe. However, the makers of Shazam! which came out in China on April 5,have a different opinion on the superhero movie.
It’s “just a light, funny...action comedy about a boy in a superman's body”, wrote Owen Gleiberman in his review for Variety magazine.
Billy Batson, the film's main character, is a 14-year-old who's been in and out of foster homes(寄养家庭). One day, on the way to another home, Batson escapes to the subway and meets a wizard(巫师), who gives him magical powers. Whenever Batson says "Shazam", he changes into an adult-sized man with superhuman strength.
But how does he use his new superpowers? With the help of his new foster brother Freddie Freeman, Batson tests his strength like any teenager would do-by breaking the rules. He breaks a soda machine to get a drink, tricks his teachers, and even buys beer.
While the film is fun and joyous, it also has emotional weight. A major part of the story is Batson searching for his real mother. And later when Batson faces the evil Dr. Thaddeus Sivana, a former misfit kid himself, he realizes that his new found superpowers can't solve all the problems, and that he has something valuable to protect-his new family.
“With strong messages about families of all shapes and sizes and the importance of supporting and educating young people, Shazam! really feels like the movie we need right now,” Den of Geek website noted.
1.How is Shazam different from other superhero movies?
A.It has a complex, serious storyline. B.It is about the end of the universe.
C.It has several important characters. D.It has a light and funny atmosphere.
2.What do we know about Billy Batson in Shazam!?
A.He was born with magical powers.
B.He lives with a wizard near the subway.
C.He enjoys his time with his foster family.
D.He has no idea who his real mother is.
3.What can we learn about Batson from the second to last paragraph?
A.He fails to find his real mother in the end.
B.He loves playing tricks with his magic powers.
C.He realizes what his new family means to him.
D.He teaches Dr. Thaddeus Sivana to be a good person.
4.What's the main purpose of the article?
A.To share the author's view about families.
B.To introduce the movie, Shazam!.
C.To persuade readers to watch Shazam!.
D.To teach readers how to write a movie review.
China's Five-hundred-meter Aperture Spherical Radio Telescope(FAST)has detected a repeating fast radio burst(FRB)-mysterious radio signals from outer space-for the first time, Science and Technology Daily reported.
Scientists on the FAST project with the National Astronomical Observatories of China(NAOC)revealed the news last Wednesday. The FRB originated some three billion lightyears away from Earth. Other factors including aircraft and satellites have been dismissed and cross examination is being carried out, the scientists said.
FRB has since become one of the hottest topics in astronomy. It was not until 2007 when the first FRB was discovered by humans. Fewer than 100 FRBs have been detected internationally. There is still no reasonable explanation for the origin of FRB in the international scientific community at present. FRBs mostly only appear once, which makes them very hard to track.
The FRB detected by FAST's real-time detection terminal(终端), however, is one that has been observed before, said Zhang Xinxin, an assistant engineer with the NAOC. Known as FRB121102,it was first discovered in 2012 and found to repeat in 2015.Analysis of data later located the source of the signal coming from a dwarf galaxy(矮星系) three billion light years away. The first pulse from FRB121102 was spotted by FAST on Aug 30 2019.After this, the telescope recorded dozens of pulses from the FRB over the course of days. On Sept 3 2019 alone, more than 20 pulses were detected.
The number of mysterious bursts detected so far is too small to draw any conclusions, Zhang said. FAST, the world's largest single-dish radio telescope, has a certain edge in detecting repeated FRBs. This is because the 19-beam receiver installed on FAST, covering frequency ranges of 1.05-1.45 GHz, is very sensitive to radio signals, Zhang said.
1.The whole text mainly gives us an introduction to________.
A.a brief introduction of FAST. B.a discovery of FAST
C.the validation of FAST D.the usage of FAST
2.Which of the following statements is TRUE?
A.FRB121102 is the first fast radio burst that was discovered by humans.
B.The FRB detected by China's FAST this time has not been observed before.
C.FRBs mostly only appear once, which makes them very hard to track.
D.We can infer that billion-light year is a term of time in astronomy.
3.Aperture Spherical Radio Telescope(FAST)/_______
A.is the world's largest radio telescope
B.has detected more than 100 FRBs
C.found reasonable explanation for the origin of FRB
D.has been installed with the 19-beam receiver
假设你是晨光中学的李津。下周你校将与英国友好校举办一场在线会议, 探讨如何利用网络学习英语, 请你根据以下提示撰写一篇发言稿：
（1）介绍你是如何利用网络学习英语的（至少写出两点）；
（2）简单谈谈你对利用网络学习英语的看法；
（3）请友好校的学生分享他们的经验。
注意：（1）词数不少于100；
（2）可适当加入细节, 使内容充实、行文连贯；
（3）开头和结尾已给出, 不计入总词数。
Good morning, dear friends. My name is Li Jin. I'd like to take this opportunity to talk about how I learn English on the Internet.
_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Thank you.
阅读短文, 按照题目要求用英语回答问题。
I remember the day shyness took over my life. I was 14 and having a French lesson. The teacher told us to record ourselves speaking about a holiday. Perfect ! I recorded myself with confidence. Then, I pressed "play" to listen back. All I heard was a little kid talking. My immediate reaction was to assume I was listening to someone else's recording .But that was my voice. I realised there was something strange about me.
My little voice has made me feel really shy. And my shyness has caused me to avoid attending events, not make important connections, and keep my ideas to myself. As a shy person, working from home, hiding behind my computer was brilliant. But the more time I spent hidden away, the more my comfort zone shrank(缩小). Everyday interactions, like ordering a coffee, became increasingly awkward and uncomfortable.
And then, one day I was at a big conference and it suddenly hit me like lightning. All speakers were confident, comfortable with being seen. There were no quieter voices. But the trouble is, if the loud voices are the only ones you hear, we quiet people feel even more alienated (疏远的). The world needs a mixture of personalities. Success is not just about who can shout the loudest. The world needs quieter people, too. That day I chose to stop hiding and embrace my shyness. No more feeling like I needed to change who I am in order to succeed. No more living a small life.
Then I created the Shy and Mighty Society, a space for shy people like me to shine and in the process of helping others, I could also push myself forward, bit by bit. Now, I'm happy to tell people I feel shy. I'm not ashamed any more. And I know that I'm not alone.
1.Why did the author feel strange about herself after listening to the recording? (no more than 10 words)
2.What is the main idea of Para. 2 ? (no more than 10 words)
3.What does the underlined word in Para. 3 mean? (1 word)
4.Why did the author create the Shy and Mighty Society? (no more than 10 words)
5.Suppose you are in charge of the Shy and Mighty Society, what will you do to help other shy people? And why? (no more than 20 words)
Studying a subject that you feel pointless is never a fun or easy task. If you're studying history, asking yourself the question "why is history important" is a very good first step. History is an essential part of human civilization. You will find something here that will arouse your interest, or get you thinking about the significance of history.
History grounds us in our roots. History is an important and interesting field of study, and learning the history of our home country can give us a deeper, more meaningful glimpse(一瞥)into our ancestral pasts, and how we got to where we are today. Many people feel like they need a sense of cultural belonging, which is something that studying your roots and being open-minded to the evolution of your culture can provide.
History enriches our experience. Reading history is an amazing experience because it enables us to reflect on the social and economic life of the people living long time ago According to the experts, problems faced by people regardless of the past and present are the same. With the information about the ancestors, one can become more experienced in handling challenges of life.
History makes us more empathetic.(具有共情能力的). Studying history can give us insight(洞察力)into why our culture does certain things, and how the past has shaped it into what we know now. It also provides a rather strong foundation for empathy across cultures. Fear and hate for others is usually caused by ignorance(无知). We're scared of the things that we don't understand. History has the potential to break down those boundaries by offering us insight into entire worlds that would otherwise be foreign to us.
History can inspire us to learn more. What's fantastic about history is the way it broadens our horizons. It's almost impossible to learn about one historical period without having dozens of questions about related concepts. Study the 19th century England, and you might catch a glimpse of Charles Dickens' Oliver Twist. Look up Charles Dickens, and you might learn a thing or two about realism. Or maybe you end up switching your attention away from novels, and discover the history of romantic poets in England. It can go anywhere, and there is something in there for absolutely anybody.
The value of history cannot be underestimated. We don't have to live in the past, but we can definitely do better by learning from it and using the lessons learnt to lead more meaningful lives.
1.The underlined part "where we are today" in Para. 2 probably means_______.
A.the turning point in our history
B.the present state of our nation
C.the location of our homeland
D.the total area of our country
2.According to the experts, why is history useful for people to handle challenges of life?
A.The problems at present are similar to those in the past.
B.Ancient people laid economic foundations for people today.
C.The current challenges of life were predicted by the ancestors.
D.People living long time ago knew more about how to solve problems.
3.What can be concluded from Para. 4?
A.It is difficult to get rid of cultural barriers.
B.People are willing to accept foreign cultures.
C.Cultural conflicts in history are difficult to ignore.
D.History helps us improve our cross-cultural awareness.
4.With the example in Para. 5, the writer intends to show that________.
A.Charles Dickens contributes much to British literature.
B.Oliver Twist can satisfy our curiosity for romantic poets.
C.reading novels is a way to learn about a historical period.
D.studying history can arouse people's interest in other fields.
5.What could be the best title for the passage?
A.How to Build Cultural Identity?
B.Why Studying History Matters?
C.Know the Past, Know the Present.
D.History: a Way to Broaden Horizons.
