雅思阅读模拟试题精选
雅思阅读模拟试题及参考答案
雅思阅读模拟试题及参考答案第一篇试题1. 根据文章，下列哪个陈述是正确的？A. 研究显示，电子设备使用对儿童的发展没有任何负面影响。
B. 儿童使用电子设备越多，他们的社交技能就越好。
C. 儿童使用电子设备会导致面部表情能力的退化。
D. 儿童使用电子设备的时间越长，他们的注意力就越集中。
2. 从文章中可以推断出什么？A. 青少年现在比以前更喜欢户外活动。
B. 大多数青少年每天使用电子设备超过五个小时。
C. 电子设备对青少年的学习成绩没有任何影响。
D. 青少年对电子设备的使用并不感到有罪恶感。
参考答案1. C2. B第二篇试题1. 从文章中可以推断出什么？A. 女性企业家比男性企业家更成功。
B. 女性企业家的工作时间比男性企业家更长。
C. 女性企业家通常在家庭和事业之间取得平衡。
D. 女性企业家比男性企业家更有创造力。
2. 根据文章，下列哪个陈述是正确的？A. 女性企业家的成功很大程度上取决于她们的家庭支持。
B. 现代女性企业家比过去更受到鼓励和支持。
C. 女性企业家在创业过程中面临更多障碍。
D. 女性企业家的成功主要归功于她们的教育背景。
参考答案1. C2. C第三篇试题1. 根据文章，下列哪个陈述是错误的？A. 生活在城市中的人更容易受到空气污染的影响。
B. 城市居民的健康状况普遍比农村居民更差。
C. 长期暴露在空气污染中可能导致呼吸系统疾病。
D. 空气质量对人们的心理健康没有影响。
2. 从文章中可以推断出什么？A. 空气污染对于城市居民来说是不可避免的。
B. 空气质量对于人们的生活质量非常重要。
C. 农村地区的空气质量比城市地区好。
D. 空气污染主要由工业排放引起。
参考答案1. B2. B注意事项请注意，以上参考答案仅供参考，具体情况还需根据文章内容进行判断。
雅思阅读考前模拟题附答案
雅思阅读考前模拟题附答案为了帮助考生更好地备战雅思阅读考试，我们精心准备了一份雅思阅读考前模拟题，并提供了详细的答案解析。
以下是模拟题的内容及答案。
一、多项选择题阅读以下文章，回答问题。
文章：问题：1. Which of the following statements is TRUE according to the passage?A. The Internet has no influence on our daily life.B. The excessive use of the Internet leads to negative consequences.C. The Internet is not used for entertainment purposes.答案：B. The excessive use of the Internet leads to negative consequences.二、判断题阅读以下文章，判断句子是否正确。
文章：Technological advancements have significantly changed the way we live and work. Automation and artificial intelligence have replaced many traditional jobs, leading to concerns about unemployment.问题：1. The Internet has no influence on the way we live and work.2. Technological advancements have led to an increase in unemployment.答案：1. FALSE (The Internet has a significant influence on the way we live and work.)2. TRUE (Technological advancements have led to concerns about unemployment.)三、填空题阅读以下文章，完成句子。
雅思考试阅读模拟试题及答案解析一(1篇)
雅思考试阅读模拟试题及答案解析一(1篇)雅思考试阅读模拟试题及答案解析一 1New evidence has linked a monly prescribed sleep medication with bizarre behaviours，including a case in which a woman painted her front door in her sleep.UK and Australian health agencies have released information about 240 cases of odd occurrences，including sleepwalking，amnesia and hallucinations among people taking the drug zolpidem.While doctors say that zolpidem can offer much-needed relief for people with sleep disorders，they caution that these newly reported cases should prompt a closer look at its possible side effects.Zolpidem，sold under the brand names Ambien，Stilnoct and Stilnox，is widely prescribed to treat insomnia and other disorders such as sleep apnea. Various forms of the drug，made by French pharmaceutical giant Sanofi-Aventis，were prescribed 674，500 times in 2005 in the UK.A newly published report from Australia’s Federal Health Department describes 104 cases of hallucinations and 62 cases of amnesia experienced by people taking zolpidem since marketing of the drug began there in 2000. The health department report also mentioned 16 cases of strangesleepwalking by people taking the medication.Midnight snackIn one of these sleepwalking cases a patient woke with a paintbrush in her hand after painting the front door to her house. Another case involved a woman who gained 23 kilograms over seven months while taking zolpidem. “It was only when she was discovered in front of an open refrigerator while asleep that the problem was resolved，” according to the re port.The UK’s Medicines and Healthcare products Regulatory Agency，meanwhile，has recorded 68 cases of adverse reactions to zolpidem from 2001 to 2005.The newly reported cases in the UK and Australia add to a growing list of bizarre sleepwalking episodes linked to the drug in other countries，including reports of people sleep-driving while on the medication. In one case，a transatlantic flight had to be diverted after a passenger caused havoc after takingzolpidem.Hypnotic effectsThere is no biological pathway that has been proven to connect zolpidem with these behaviours. The drug is a benzodiazepine-like hypnotic that promotes deep sleep by interacting with brain receptors for a chemical called gamma-aminobutyric acid. While parts of the brain e less active during deep sleep，the body can still move，making sleepwalking a possibility.The product information for prescribers advises that psychiatric adverse effects，including hallucinations，sleepwalking and nightmares，are more likely in the elderly，and treatment should be stopped if they occur.Patient advocacy groups say they would like government health agencies and drug panies to take a closer look at the possible risks associated with sleep medicines. They stress that strange sleepwalking and sleep-driving behaviours can have risky consequences.“When people do something in which they’re not in full control it’s always a danger，” says Vera Sharav of the New York-based Alliance for Human Research Protection，a US networkthat advocates responsible and ethical medical research practices.Tried and tested“The more reports that e out about the potential side effects of the drug，the more research needs to be done to understand if these are real side effects，” says sle ep researcher Kenneth Wright at the University of Colorado in Boulder，US.Millions of people have taken the drug without experiencing any strange side effects，points out Richard Millman at Brown Medical School，director of the Sleep Disorders Center of Lifespan Hospitals in Providence，Rhode Island，US. He says that unlike older types of sleep medications，zolpidem does not carry as great a risk of addiction.And Wright notes that some of the reports of “sleep-driving” linked to zolpidem can be easily explained：some patients have wrongly taken the drug right before leaving work in hopes that the medicine will kick in by the time they reach home. Doctors stress that the medication should be taken just before going to bed.The US Food Drug Administration says it is continuing to “actively investigate" and collect information about cases linking zolpidem to unusual side effects.The Ambien label currently lists strange behaviour as a “special concern” for people taking the drug. “It’s a possi ble rare adverse event，” says Sanofi-Aventis spokesperson Melissa Feltmann，adding that the strange sleepwalking behaviours “may not necessarily be caused by the drug” but instead result from an underlying disorder. She says that “the safety profile [of zo lpidem] is well established”. The drug received approval in the US in 1993.Questions 1-6Do the following statements agree with the information given in the reading passage?In boxes 1-6 on your answer sheet writeTRUE if the statement is true according to the passageFALSE if the statement is false according to the passageNOT GIVEN if the information is not given in the passage1. Ambien，Stilnoct and Stilnox are brand names of one same drug treating insomnia.2. The woman’s obesity problem wasn’t resolved until she stopped taking zolpidem.3. Zolpidem received approval in the UK in 2001.4. The bizarre behaviour of a passenger after taking zolpidem resulted in the diversion of a flight bound for the otherside of the Atlantic.5. Zolpidem is the only sleep medication that doesn’t cause addiction.6. The sleep-driving occurrence resulted from the wrong use of zolpidem by an office worker.Question 7-9Choose the appropriate letters A-D and Write them in boxes 7-9 on your answer sheet.7. How many cases of bizarre behaviours are described in an official report from Australia?A. 68B. 104C. 182D. 2408. Which of the following is NOT mentioned in the product information about zolpidem?A. Treatment should be stopped if side effects occur.B. Medication should be taken just before going to bed.C. Adverse effects are more likely in the elderly.D. Side effects include nightmares，hallucinations and sleepwalking.9. Who claimed that the safety description of zolpidem waswell established?A. Kenneth WrightB. Melissa FeltmannC. Richard MillmanD. Vera SharavQuestions 10-13Answer the following questions with NO MORE THAN THREE WORDS each in boxes 10-13.10. How many times was French-made zolpidem prescribed in 2005 in Britain?11. What kind of hypnotic is zolpidem as a drug which promotes deep sleep in patients?12. What can sleepwalking and sleep-driving behaviours cause according to patient advocacy groups?13. What US administration says that it has been investigating the cases relating zolpidem to unusual side effects? Answer keys and explanations：1. TrueSee para.3 from the beginning：Zolpidem，sold under the brand names Ambien，Stilnoct and Stilnox，is widely prescribed to treat insomnia and other disorders such as sleep apnea.2. FalseSee para.1 under the subtitle “Midnight snack”：Another case involved a woman who gained 23 kilograms over seven months while taking z olpidem. “It was only when she was discovered in front of an open refrigerator while asleep that the problem was resolved”。
详细解答雅思阅读模拟试题
详细解答雅思阅读模拟试题试题一：词汇理解（20分钟）阅读以下段落，然后回答问题。
段落：问题：1. What is the main idea of the paragraph?2. According to the paragraph, what are the advantages and disadvantages of the Internet?{content}试题二：长篇阅读（40分钟）阅读以下文章，然后回答问题。
文章：The Impact of Social Media on Teenagers问题：1. What is the main topic of the article?2. According to the article, what are the potential negative effects of excessive social media use among teenagers?{content}试题三：信息匹配（20分钟）阅读以下段落，然后匹配每个段落与其主题。
段落：1. The Internet has changed the way we access information. We can now find answers to our questions with just a few clicks.2. Social media platforms often promote unrealistic lifestyles and beauty standards, which can lead to feelings of inadequacy and pressure among users.主题：A. The advantages of the InternetB. The disadvantages of the InternetC. The impact of social media on teenagersD. Online privacy concerns{content}答案解析试题一答案解析1. The main idea of the paragraph is to discuss the role of the Internet in our daily lives and the challenges it poses.试题二答案解析1. The main topic of the article is the impact of social media on teenagers.2. The potential negative effects of excessive social media use among teenagers mentioned in the article are low self-esteem, depression, and addiction.试题三答案解析1. Paragraph 1 matches with theme A (The advantages of the Internet) as it discusses the ease of accessing information online.2. Paragraph 2 matches with theme C (The impact of social media on teenagers) as it discusses the negative effects of social media on users' self-image.3. Paragraph 3 matches with theme D (Online privacy concerns) as it discusses the issue of personal data collection and privacy.希望以上解答对您有所帮助，如有任何疑问，请随时提问。
雅思阅读练习题(打印版)
雅思阅读练习题（打印版）题目一：环境变化对生物多样性的影响问题：1. 环境变化对生物种群的总体影响是什么？2. 为什么某些物种能够适应环境变化而其他物种则不能？3. 人类活动如何影响生物多样性？4. 保护生物多样性的措施有哪些？题目二：教育对个人发展的重要性问题：1. 教育如何影响个人的职业发展？2. 教育对于社会经济发展的作用是什么？3. 为什么终身学习是现代社会的一个重要趋势？4. 教育不平等问题如何解决？题目三：城市化进程中的挑战问题：1. 城市化给环境带来了哪些挑战？2. 城市化如何影响社会结构？3. 城市化进程中，政府应如何平衡经济发展与居民生活质量？4. 城市化对农村地区的影响有哪些？题目四：健康生活方式的重要性问题：1. 健康生活方式对于预防疾病的作用是什么？2. 为什么运动是健康生活方式的重要组成部分？3. 健康饮食的重要性体现在哪些方面？4. 如何克服不良生活习惯，培养健康的生活方式？题目五：科技在教育中的应用问题：1. 科技如何改变传统的教育模式？2. 在线教育与传统教育相比有哪些优势和劣势？3. 科技在教育中应用的挑战有哪些？4. 如何确保科技在教育中的有效应用？题目六：气候变化的全球影响问题：1. 气候变化对全球经济的潜在影响是什么？2. 气候变化如何影响农业和粮食安全？3. 应对气候变化的国际合作现状如何？4. 个人和社区如何参与到应对气候变化的行动中？题目七：社交媒体对人际关系的影响问题：1. 社交媒体如何改变人们的交流方式？2. 社交媒体对青少年心理健康的影响是什么？3. 社交媒体在社会运动中的作用有哪些？4. 如何平衡社交媒体的使用与现实生活的联系？题目八：旅游业对经济和文化的影响问题：1. 旅游业对当地经济的促进作用是什么？2. 旅游业如何影响文化遗产的保护？3. 旅游业对环境的负面影响有哪些？4. 可持续旅游的概念及其重要性是什么？请根据以上题目进行阅读练习，注意理解文章主旨，掌握细节信息，并能够回答相关问题。
雅思阅读模拟试题
雅思阅读模拟试题雅思阅读模拟试题精选阅读是雅思考试中非常重要的部分，很多考生阅读成绩不是很理想，在这方面考生们既要加强自己的词汇量和语法知识，同时也要多加练习。
Education PhilosophyAIn 1660s, while there are few accurate statistics for child mortality in the preinduslrial world, there is evidence that as many as 30 percent of all children died before they were 14 days old. Few families survived intact. All parents expected to bury some of their children and they found it difficult to invest emotionally in such a tenuous existence as a newborn child. When the loss of a child was commonplace, parents protected themselves from the emotional consequences of the death by refusing to make an emotional commitment to the infant. How else can we explain mothers who call the infant or leave dying babies in gutters, or mention the death of a child in the same paragraph with a reference to pickles?BOne of the most important social changes to take place in the Western world in 18th century was the result of the movement from an agrarian economy to an industrial one. Increasingly, families left the farms and their small-town life and moved to cities where life was very different for them. Social supports that had previously existed in the smaller community disappeared, and problems of poverty, crime, sub-standard housing and disease increased. For the poorest children, childhood could be painfully short, as additional income was needed to help support the family and young children were forced into early employment. Children as young as 7 might berequired to work full-time jobs, often under unpleasant and unhealthy circumstances, from factories to prostitution. Although such a role for children has disappeared in most economically strong nations, the practice of childhood employment has hardly disappeared entirely and remains a staple (主要的)in many undeveloped nations.COver the course of the 1800s, the lives of children in the Unites States began to change drastically. Previously, children in both rural and urban families were expected to take part in the everyday labor of the home, as the bulk of manual work had to be completed there. However, establishing a background the technological advances of the mid-1800s, coupled with the creation of a middle class and the redefinition of roles of family members, meant that work and home became less synonymous(同义的)over the course of time. People began to buy their children toys and books to read. As the country slowly becamemore dependent upon machines for work, both in rural and in urban areas, it became less necessary for children to work inside the home. This trend, which had been rising slowly over the course of the nineteenth century, look off exponentially after the Civil War, with the beginning of the Industrial Revolution. John Locke was one of the most influential writers of his period. His writings on the role of government are seen as foundational to many political movements and activities, including the American Revolution and the drafting of theDeclaration of Independence. His ideas are equally foundational to several areas of psychology. As the father of “British empiricism,” Locke made the first clear and comprehensive statement of the “environmental position” and, by so doing, became the fatherof modern learning theory. His teachings about child care were highly regarded during the colonial period in America.DJean Jacquesd Rousseau lived during an era of the American and French Revolution. His works condemn distinctions of wealth, property, and prestige. In the original state of nature, according to Rousseau, people were "noble savages", innocent, free and uncorrupted. Rousseau conveyed his educational philosophy through his famous novel Emile, in 1762, which tells the story of a boy's education from infancy to adulthood. Rousseau observed children and adolescents extensively and spoke of children's individuality, but he based much of his developmental theory on observation in writing the book, and on the memories of his own childhood. Rousseau contrasts children to Developmental Psychology in Historical Perspective adults and describes age-specific characteristics. Johan Heinrich Pestalozzi lived during the early stages of industrial revolution, he sought to develop schools would nurture children's development. He agreed with Rousseau that humans are naturally good but were spoiled by a corrupt society. Pestalozzi's approach to teaching can be divided into the general and special methods. The theory was designed to create an emotionally healthy homelike learning environment that had to be in place before more specific instruction occurred.EOne of the best documented cases of all the so-called feral children concerned a young man who was captured in a small town in the south of France in 1800, and who was later named Victor. The young man had been seen in the area for months before his final capture - pre-pubescent, mute, and naked, perhaps 11 or 12 years old, foraging for food in the gardens of the locals and sometimes accepting their direct offers of food.Eventually he was brought to Paris, where itwas hoped that he would be able to answer some of the profound questions about the nature of man, but that goal was quashed very early. Jean-Marc-Gaspard Itard, a young physician who had become interested in working with the deaf, was more optimistic about a future for Victor and embarked on a five-year plan of education to civilize him and teach him to speak. With a subsidy from the government, Itard spent an enormous amount of time and effort working with Victor. He was able to enlist the help of a local woman, Madame Gu erin, to assist in his efforts and provide a semblance of a home for Victor. But, after five years and despite all of his efforts, Hard considered the experiment to be a failure. Although Victor had learned some elementary forms of communication, he never learned the basics of speech, which, for Itard, was the goal. Victor's lessons were discontinued, although he continued to live with Madame Gu erin until his death, approximately at the age of 40.FOther educators were beginning to respond to the simple truth that was embedded in the philosophy of Rousseau. Identifying the stages of development of children was not enough. Education had to be geared to those stages. One of the early examples of this approach was the invention of the kindergarten (“the children’s garden”)- a word and a movement created by Friedrich Froebel in 1840, a German-born educator. Froebel placed particular emphasis on the importance of play in a child's learning. His invention, in different forms, would eventually find its way around the world. His ideas about education were initially developed through his association with Johann Heinrich Pestalozzi. Froebel spent five years teaching at one of Pestalozzi's model schools in Frankfurt, and later hestudied with Pestalozzi himself. Eventually he was able to open his own schools to test his educational theories. One of his innovative ideas was his belief that women could serve as appropriate educators of young children - an unpopular view at the time. At the age of 58, after almost four decades as a teacher, Froebel introduced the notion of the kindergarten. It was to be a haven and a preparation for children who were about to enter the regimented educational system. A cornerstone of his kindergarten education was the use of guided or structured play. For Froebel, play was the most significant aspect of development at this time of life. Play served as the means for a child to grow emotionally and to achieve a sense of self-worth, the role of the teacher was to organize materials and a structured environment in which each child, as an individual, could achieve these goals. By the time of Froebel’s death in 1852, dozens of kinde rgartens had been created in Germany. Their use increased in Europe and the movement eventually reached and flourised in the United States in 20th century.Questions 28-31The reading passage has seven paragraphs, A-EChoose the correct heading for paragraphs A-E from the list below.Write the correct number, i-vii, in boxes 28-31 on your answer sheet.List of Headingsi Reasons of unusual experiments implemented by several thinkersii Children had to work to alleviate burden on familyiii Why children are not highly valuediv Children died in hospital at their early agev Politics related philosophy appearedvi Creative learning method was applied on certain wild kid vii Emerge and spread of called kindergarten28 Paragraph AExampleParagraph B ii Children have to work29 Paragraph C30 Paragraph D31 Paragraph EQuestions 32-35Use the information in the passage to match the time (listed A-C) with correct event below. Write the appropriate letters A-F in boxes 32-35 on your answer sheet.A 18th centuryB 19th centuryC 20th century32 need for children to work33 rise of middle class34 emergence of a kindergarten35 the kindergarten in the spread around USQuestions 36-40Use the information in the passage to match the people (listed A-D) with opinions or deeds below. Write the appropriate letters A-D in boxes 36-40 on your answer sheet.A Jean Jacquesd RousseauB Jean-Marc-Gaspard ItardC Johan Heinrich PestalozziD Friedrich Froebel36 was not successful to prove the theory37 observed a child's record38 requested a study setting with emotional comfort firstly39 corruption is not a characteristic in people's nature40 responsible fo篇章结构体裁科普说明文题目儿童教育哲学与历史结构A：为何父母并不是十分重视孩子B：孩子们需要工作，以减轻对家庭的负担C：中产阶级富足的生活的出现，促进了政治相关的哲学的出现D：几个思想家进行的研究以及结论和整个的分析E：创造性的学习方式被应用在几个野孩子的教育之中F：幼儿园理论的整个发展和传播试题分析Question 1-。
雅思阅读模拟练习题及答案
【导语】上⼀次的雅思考试已经结束，下⼀次的雅思考试还会远吗?为了帮助⼤家在雅思考试中取得好成绩，下⾯就是为⼤家收集整理的雅思阅读模拟练习题及答案，供⼤家参考。
更多雅思报名的最新消息，最专业的雅思备考资料，请关注。
Birthdays often involve surprises. But this year‘s surprise on the birthdayof the great British playwright William Shakespeare is surely one of the mostdramatic. On April 22， one day before his 441st birthday anniversary， expertsdiscovered that one of the most recognizable portraits of William Shakespeare isa fake. This means that we no longer have a good idea of what Shakespeare lookedlike. "It‘s very possible that many pictures of Shakespeare might be unreliablebecause many of them are copies of this one，" said an expert from Britain’sNational Portrait Gallery. The discovery comes after four months of testing using X-rays， ultravioletlight， microphotography and paint samples. The experts from the gallery say theimage—commonly known as the “Flower portrait” —was actually painted in the1800s， about two centuries after Shakespeare‘s death. The art experts who workat the gallery say they also used modern chemistry technology to check the painton the picture. These checks found traces of paint dating from about 1814.Shakespeare died in 1616， and the date that appears on the portrait is 1609. “We now think the portrait dates back to around 1818 to 1840. This was whenthere was a renewed interest in Shakespeare‘s plays，” Tarnya Cooper， thegallery’s curator(馆长)， told the Associated President. The fake picture has often been used as a cover for collections of hisplays. It is called the Flower portrait because one of its owners， DesmondFlower， gave it to the Royal Shakespeare Company. “There have always been questions about the painting，” said David Howells，curator for the Royal Shakespeare Company. “Now we know the truth， we can putthe image in its proper place in the history of Shakespearean portraiture.” Two other images of Shakespeare， are also being studied as part of theinvestigation(调查) and the results will come out later this month. ______________________________________________________________. 1. Why this year‘s surprise on the birthday of Shakespeare is dramatic? _______________________________________________________________________________ 2. Now we know what Shakespeare looked like. (T/F) 3. “Flower portrait” was actually painted using X-rays， ultraviolet light，microphotography and paint samples. (T/F) 4. In history， many people doubted the painting. (T/F) 5.Which is the best sentence to fill in the blank in the lastparagraph? A.Soon we‘ll know which portrait is reliable. B.Maybe we cannot find a real portrait of Shakespeare. C.If the two portraits are found to be false， they will test more. D.For now what Shakespeare really looked like will remain a mystery.1. The Flower portrait has been found to be a fake.2. F3. F4. T5. D。
雅思模拟测试题及答案
雅思模拟测试题及答案一、听力部分1. 根据所听对话，选择正确答案。
A. 去图书馆B. 去电影院C. 去超市D. 去公园[答案] B2. 根据所听短文，回答以下问题：Q: 演讲者提到了哪些地方的旅游胜地？A. 巴黎B. 纽约C. 伦敦D. 悉尼[答案] C二、阅读部分1. 阅读以下段落，判断以下陈述是否正确。
陈述一：文中提到了三种不同的学习方法。
陈述二：作者认为自学是最有效的学习方式。
[答案] 陈述一：正确；陈述二：错误。
2. 根据文章内容，选择最佳标题。
A. 学习方法的比较B. 学习环境的重要性C. 学习工具的选择D. 学习时间的管理[答案] A三、写作部分1. 请根据以下图表，写一篇不少于150字的报告，描述该地区的人口变化趋势。
[范文]根据图表显示，该地区在过去十年中经历了显著的人口增长。
2005年，人口数量为500,000，而到了2015年，人口数量增长至750,000。
这种增长趋势反映了该地区经济的快速发展和生活条件的改善。
预计未来几年，人口数量将继续增长。
2. 请针对以下问题写一篇议论文，阐述你的观点。
问题：是否应该在城市中禁止使用私家车？[范文]私家车在城市中的使用带来了诸多问题，如交通拥堵和环境污染。
然而，私家车也为人们的出行提供了便利。
我认为，应该通过提高公共交通的效率和鼓励使用环保车辆来逐步减少私家车的使用，而不是立即禁止。
四、口语部分1. 描述你最喜欢的一项运动，并解释为什么喜欢它。
[答案]我最喜欢的运动是游泳。
我喜欢游泳，因为它是一项全身运动，可以锻炼身体的各个部位。
此外，游泳还能帮助我放松心情，减轻压力。
2. 讨论一下你如何看待社交媒体对青少年的影响。
[答案]社交媒体对青少年有着复杂的影响。
一方面，它为青少年提供了与朋友交流和获取信息的平台。
另一方面，过度使用社交媒体可能导致青少年沉迷于虚拟世界，影响他们的学习和社交能力。
因此，家长和学校应该引导青少年合理使用社交媒体。
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雅思阅读模拟试题精选
雅思阅读模拟试题精选
1. Washing， brushing and varnishing fossils — all standard conservation treatments used by many fossil hunters and museum curators alike —vastly reduces the chances of recovering ancient DNA.
2. Instead， excavators should be handling at least some of their bounty with gloves， and freezing samples as they are found， dirt and all， concludes a paper in the Proceedings of the National Academy of Sciences today.
3. Although many palaeontologists know anecdotally that this is the best way to up the odds of extracting good DNA， Eva-Maria Geigl of the Jacques Monod Institute in Paris， France， and her colleagues have now shown just how important conservation practices can be. This information， they say， needs to be hammered home among the
people who are actually out in the field digging up bones.
4. Geigl and her colleagues looked at 3，200-year-old fossil bones belonging to a single individual of an extinct cattle species， called an aurochs. The fossils were dug up at a site in France at two different times — either in 1947， and stored in a museum collection， or in ， and conserved in sterile conditions at -20 oC.
5. The team's attempts to extract DNA from the 1947 bones all failed. The newly excavated fossils， however， all yielded DNA.
6. Because the bones had been buried for the same amount of time， and in the same conditions， the conservation method had to be to blame says Geigl. "As much DNA was degraded in these 57 years as in the 3，200 years before，" she says.Wash in， wash out
7. Because many palaeontologists base their work on the shape of fossils alone，their methods of conservation are not designed to preserve DNA， Geigl explains.
8. The biggest problem is how they are cleaned. Fossils are often washed together on-site in a large bath， which can allow water — and contaminants in the form of contemporary DNA — to permeate into the porous bones. "Not only is the authentic DNA getting washed out， but contamination is getting washed in，" says Geigl.
9. Most ancient DNA specialists know this already， says Hendrik Poinar， an evolutionary geneticist at McMaster University in Ontario， Canada. But that doesn't mean that best practice has become widespread among those who actually find the fossils.
10. Getting hold of fossils that have been preserved with their DNA in mind relies
on close relationships between lab-based geneticists and the excavators， says palaeogeneticist Svante P??bo of the Max Planck Institute for Evolutionary Anthropology in Leipzig， Germany. And that only occurs in exceptional cases， he says.
11. P??bo's team， which has been sequencing Neanderthal DNA， continually faces these problems. "When you want to study ancient human and Neanderthal remains， there's a big issue of contamination with contemporary human DNA，" he says.
12. This doesn't mean that all museum specimens are fatally flawed， notes P??bo. The Neanderthal fossils that were recently sequenced in his own lab， for example， had been part of a museum collection treated in the traditional way. But P??bo is keen to see samples of fossils from every major find preserved in line with Geigl's。