C
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 decide 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.
28.The phrase\＿？
A.a wrong belief B.useful talk C.a scientific rule D.helpful experience 29.What do we know about red hair? A.It doesn't turn grey as people get older. B.It contains more pheomelanins than eumelanins. C.The amount of pigments in it doesn't change over time. D.People with red hair have weaker ability to produce pigments. 30.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. 31.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.
D
The great recession may be over,but this era of high joblessness is probably beginning.Before it ends,it will likely change the life course and character of a generation of young adults.And eventually,it is likely to reshape our politics,our culture,and the character of our society for years.
No one tries harder than the jobless to find silver linings in this national economic disaster.Many said that unemployment,while extremely painful,had improved them in some ways:they had become less materialistic and more financially prudent(节俭的）；they were more aware of the struggles of others.In limited respects,perhaps the recession will leave society better off.At the very least,it has awoken us from our national fever dream of easy riches and bigger houses,and put a necessary end to an era of reckless(鲁莽的）personal spending.
But for the most part,these benefits seem thin,uncertain,and far off.In The Moral Consequences of Economic Growth,the economic historian Benjamin Friedman argues that both inside and outside the U.S.,lengthy periods of economic stagnation or decline have almost always left society more mean-spirited and less inclusive,and have usually stopped or reversed the advance of rights and freedoms.Anti-immigrant sentiment typically increases,as does conflict between races and classes.
Income inequality usually falls during a recession,but it has not shrunk in this one.Indeed,this period of economic weakness may reinforce class divides,and decrease opportunities to cross them-especially for young people.The research of Till Von Wachter,the economic at Columbia
University,suggests that not all people graduating into a recession see their life chances dimmed:those with degrees from elite(精英）universities catch up fairly quickly to where they otherwise would have been if they had graduated in better times;it is the masses beneath them that are left behind.
In the Internet age,it is particularly easy to see the resentment that has always been hidden within American society.More difficult,in the moment,is discerning precisely how these lean times are affecting society's character.In many respects,the U.S.was more socially tolerant entering this recession than at any time in its history,and a variety of national polls on social conflict since then have shown mixed results.We will have to wait and see exactly how these hard times will reshape our
social fabric(组织）。But they certainly will reshape it,and all the more so the longer they extend.
32.By saying\to_____
A.seek help from the government B.explore reasons for the unemployment C.make profits from the troubled economy D.look on the bright side of the recession
33.Benjamin Friedman believes that economic recessions may_ A.impose a heavy burden on immigrants B.bring out more evils of human nature C.promote the advance of rights and freedoms D.ease conflicts between races and classes
34.The research of Till Von Wachter suggests that in the recession graduates from elite universities tend to ____
A.lag behind the others due to decreased opportunities B.catch up quickly with experienced employees C.see their life chances as dimmed as the others D.recover more quickly than the others
35.The author thinks that the influence of hard times on society is____ A.certain B.positive C.unimportant D.destructive 第二节 七选五（共5小题；每小题2分，共10分）
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选 项。
Tips for Success in Online Learning
You may be one of the increasing number of students who is trying to achieve a college degree online.If so,follow these tips to help you be a successful online learner.
36 Many students think that online classes require less work and are easier than traditional classes.In fact,online classes are designed to be just as exact and difficult as traditional courses.Be prepared to do at least six hours of work a week in an online
course.Some weeks and some full classes will require far more than that,especially during the weeks of finals and midterms.
Pay attention to the course learning aims.
37. Don't ignore them.Course aims are carefully planned and they are the foundations(基础）around which a well-designed course is
built.Lectures,activities,written assignments,discussion boards,and tests-in fact,everything in a course-flow from the aims. Be open to new ways of learning.
Students learn in different ways,and teachers often use kinds of strategies to meet different kinds of learning styles.Give videos and audio files a try,even if they seem different from what you're used to.38_.Be open to it. Join with all your heart.
A good posting would cause thought-provoking(引发深思的）questions related to the lesson's topic and would be many sentences.39.A well-designed discussion board is designed to produce thoughtful talking. Make a regular schedule.
Log on(登录）to your course every day or at a minimum five days a week.Since courses are designed for students to do at least six hours of work each week,it's not wise or effective to wait until the end of the week to do the coursework.40.It is just as you would in a traditional course. A.Do not make a guess B.Read and practice everything C.Every course has learning aims
D.Be comfortable communicating through text E.Manage your time and do some work each day F.You will likely be given points for your postings
G.Well-designed courses use technology to improve learning
第三部分：英语知识运用（共二节；满分45分）
第一节：完型填空（共20小题；每小题1.5分，满分30分）
阅读下面短文，从短文后各题所给的四个选项（A、B、C和D)中，选出可以填入空白处的最佳选项。
I will never forget the story I experienced when I worked as a doctor for some\
With mixed emotions I went to the young criminal center to 41 vaccinations(接种疫苗）。On one hand,I felt 42 to be able to 43 a service that might have a positive health effect on the prisoners.But,on the other hand,I felt a sense of sadness and 44 _as I saw the prisoners being 45 by guards to the nursing unit. My last visit was very 46.For some reason,there was a(an) 47 in the air.And I felt a lightness as I spoke with each prisoner.We 48 stories,smiles and fears.Even the toughest prisoners seemed to be surrounded by light.As a mother,I saw them as not only youth,being 49 for crimes,but also as children with the 50 to change for the better.Obviously,most of them wanted to 51 longer! There was one more prisoner.He was 52 to a different unit in a lonely cell.Two guards escorted us down and when we entered the cell,instant tears 53_in my eyes.The area was sad.Guards there didn't smile.Later,we were done but I didn't want to 54,I gave the 17 year old a gentle touch and smile as I 55 to him what to do concerning the side effects.At first there was no response,so I just 56 at his bare feet and then to my supplies.I thought that I had better pack up.57,he looked up at me and smiled before he said\then he gave me a thumbs-up.I smiled back,saying,\
It was wonderful to receive a kind 58 from someone who was in such a 59 place.As we walked back to the main entrance,we didn't speak.Where there can be a smile,there is hope.Sometimes 60 can be very powerful. 41.A.accept B.deliver C.illustrate D.give 42.A.thankful
B.satisfied C.lucky D.thrilled
B.annoyance C.loneliness
D.thrown
43.A.suggest B.provide C.confirm D.observe 44.A.disappointment D.doubt
46.A.valuable D.adaptable
47.A.expectation D.complaint 48.A.expanded D.presented
49.A.punished D.criticized
45.A.escorted B.accompanied C.directed
B.enjoyable C.memorable B.lightness C.attraction B.told C.shared B.scolded
C.commented
50.A.reason B.impression C.arrangement D.potential
51.A.talk D.work
B.stay C.relax
湖南省长望浏宁四县（区、市）2020届高三联考 英语（含答案）
