Broken rubber bands and flat tires requiring replacement could soon be a thing of the past．French researchers have developed a new kind of rubber that can repair itself when broken．The new rubber is made from widely available materials including vegetable oil and a common industrial chemical．All the materials are considered safe to the environment and can be easily reused．The best part is that the new rubber can be repaired and used again and again without losing its strength or ability or stretch．When cut, the rubber can be made new again, simply by pressing the two broken ends back together．The product can be repaired at room temperature, around twenty degrees Centigrade；other self-healing materials require higher temperatures for repair．Traditionally, rubber substances are made from huge molecules（分子）connected by strong chemical links, or bonds．The new rubber is made of smaller molecules．The molecules are linked together using hydrogen bonds．When connected in this way, the molecules act like one long molecule, forming what is called supramolecular networks（超分子网）．When the rubber is cut, the molecules attempt to connect with whatever molecule is near them．When pressed together, the molecules are able to repair themselves at the molecular level, making the repaired rubber like new．However, time is an important element in the process．If the broken ends are not brought together quickly, a repair is not possible．This is because molecules will form bonds with molecules on their own side．The inventors say the surfaces of the rubber can be repaired within a week of being separated．The rubber is the creation of scientists at the Industrial Physics and Chemistry Higher Education Institution in Paris．The organization is part of France’s National Center for Scientific Research．The new material is described in greater detail in the research publication Nature．【小题1】According to the introduction, which of the following is NOT the advantage of the new rubber?A．It can be made as easily as common rubber．B．It is environmentally-friendly．C．It can repair itself at room temperature．D．It is made of smaller molecules．【小题2】What does the 5th paragraph mainly tell us?A．Why the new rubber is unique．B．Why the new rubber can repair itself．C．The new rubber is made from huge molecules．D．The new rubber is different from the common rubber．【小题3】If we want to know more about the technology of this kind of new rubber, where can we get the information?A．In the researchers’ diary．B．In a guide book．C．In a research magazine．D．In a newspaper． - 跟谁学
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跟谁学学生版:genshuixue_student精品好课等你领在线咨询下载客户端关注微信公众号&&&分类：Broken rubber bands and flat tires requiring replacement could soon be a thing of the past．French researchers have developed a new kind of rubber that can repair itself when broken．The new rubber is made from widely available materials including vegetable oil and a common industrial chemical．All the materials are considered safe to the environment and can be easily reused．The best part is that the new rubber can be repaired and used again and again without losing its strength or ability or stretch．When cut, the rubber can be made new again, simply by pressing the two broken ends back together．The product can be repaired at room temperature, around twenty degrees Centigrade；other self-healing materials require higher temperatures for repair．Traditionally, rubber substances are made from huge molecules（分子）connected by strong chemical links, or bonds．The new rubber is made of smaller molecules．The molecules are linked together using hydrogen bonds．When connected in this way, the molecules act like one long molecule, forming what is called supramolecular networks（超分子网）．When the rubber is cut, the molecules attempt to connect with whatever molecule is near them．When pressed together, the molecules are able to repair themselves at the molecular level, making the repaired rubber like new．However, time is an important element in the process．If the broken ends are not brought together quickly, a repair is not possible．This is because molecules will form bonds with molecules on their own side．The inventors say the surfaces of the rubber can be repaired within a week of being separated．The rubber is the creation of scientists at the Industrial Physics and Chemistry Higher Education Institution in Paris．The organization is part of France’s National Center for Scientific Research．The new material is described in greater detail in the research publication Nature．【小题1】According to the introduction, which of the following is NOT the advantage of the new rubber?A．It can be made as easily as common rubber．B．It is environmentally-friendly．C．It can repair itself at room temperature．D．It is made of smaller molecules．【小题2】What does the 5th paragraph mainly tell us?A．Why the new rubber is unique．B．Why the new rubber can repair itself．C．The new rubber is made from huge molecules．D．The new rubber is different from the common rubber．【小题3】If we want to know more about the technology of this kind of new rubber, where can we get the information?A．In the researchers’ diary．B．In a guide book．C．In a research magazine．D．In a newspaper．Broken rubber bands and flat tires requiring replacement could soon be a thing of the past．French researchers have developed a new kind of rubber that can repair itself when broken．The new rubber is made from widely available materials including vegetable oil and a common industrial chemical．All the materials are considered safe to the environment and can be easily reused．The best part is that the new rubber can be repaired and used again and again without losing its strength or ability or stretch．When cut, the rubber can be made new again, simply by pressing the two broken ends back together．The product can be repaired at room temperature, around twenty degrees Centigrade；other self-healing materials require higher temperatures for repair．Traditionally, rubber substances are made from huge molecules（分子）connected by strong chemical links, or bonds．The new rubber is made of smaller molecules．The molecules are linked together using hydrogen bonds．When connected in this way, the molecules act like one long molecule, forming what is called supramolecular networks（超分子网）．When the rubber is cut, the molecules attempt to connect with whatever molecule is near them．When pressed together, the molecules are able to repair themselves at the molecular level, making the repaired rubber like new．However, time is an important element in the process．If the broken ends are not brought together quickly, a repair is not possible．This is because molecules will form bonds with molecules on their own side．The inventors say the surfaces of the rubber can be repaired within a week of being separated．The rubber is the creation of scientists at the Industrial Physics and Chemistry Higher Education Institution in Paris．The organization is part of France’s National Center for Scientific Research．The new material is described in greater detail in the research publication Nature．【小题1】According to the introduction, which of the following is NOT the advantage of the new rubber?A．It can be made as easily as common rubber．B．It is environmentally-friendly．C．It can repair itself at room temperature．D．It is made of smaller molecules．【小题2】What does the 5th paragraph mainly tell us?A．Why the new rubber is unique．B．Why the new rubber can repair itself．C．The new rubber is made from huge molecules．D．The new rubber is different from the common rubber．【小题3】If we want to know more about the technology of this kind of new rubber, where can we get the information?A．In the researchers’ diary．B．In a guide book．C．In a research magazine．D．In a newspaper．科目:难易度:最佳答案【小题1】D【小题1】B【小题1】C解析【小题1】第一题问以下哪项不是新品种橡胶的优点，根据常识可看出ABC均为优点，而D只是一向普通属性。故选择D。【小题1】 第二题考察概括能力，问第五段的主要内容。从最后一句话the molecules are able to repair themselves at the molecular level可以看出此段主要讲述这种橡胶能够自我修复的原因。所以选B。【小题1】第三题问我们怎样获取更多信息，从最后一段最后一句话The new material is described in greater detail in the research publication Nature可以得知Nature这本杂志（首字母大写）提供更多信息。所以选C。知识点:&&&&&&基础试题拔高试题热门知识点最新试题
关注我们官方微信关于跟谁学服务支持帮助中心BBC Trust Rona Fairhead likely to approve move of BBC Three to internet only | Daily Mail Online
New chairman of BBC Trust looks likely to rubber stamp move of youth channel BBC Three to internet only
Miss Fairhead said BBC should cater more for internet and tablet viewersMore pressure on BBC to close loophole allowing catch-up TV on-line to be watched free16-24-year-olds watch 'live' television only half the time preferring TV on-lineBy
01:11 GMT, 22 October 2014
08:01 GMT, 22 October 2014
Rona Fairhead could yet save BBC Three from going entirely digital - but probably won'tTHE BBC’s new chairman has backed a controversial plan to move its youth channel online, saying the idea is ‘in and of itself good’.Despite mounting opposition from presenters and some executives, Rona Fairhead said the corporation should focus on putting even more shows on the internet.As head of the BBC Trust, Miss Fairhead has the power to block the plan to axe BBC Three, which was announced by director general Tony Hall in March.However, she hinted it is likely to be rubber stamped and said the BBC should do even more to cater for young viewers who prefer to watch television on their tablets and mobile phones.As well as dismaying those who want to save BBC Three, Miss Fairhead’s comments will heap further pressure on the BBC to close a loophole which allows viewers to watch catch-up TV online for free.More than 450,000 people avoid paying the ?145.50 licence fee every year while continuing to watch BBC shows, in many cases because they access its programmes on iPlayer.The most recent figures show that viewers aged between 16 and 24 spend just half their time watching shows as they are broadcast.
More than 450,000 people avoid paying the ?145.50 licence fee every year while continuing to watch BBC shows, in many cases because they access its programmes on iPlayer (above)Miss Fairhead told the culture, media and sport committee: ‘The statistics show that this group are watching less. They are certainly watching very differently.
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‘Although sometimes they watch by appointment - either Strictly [Come Dancing] or a sports occasion - typically they watch on-the-go through the devices they have.‘The idea of moving BBC Three and making it on-line of itself is good.’Miss Fairhead has been in her post for just two weeks, having been selected as the successor to Chris Patten after he stepped down for health reasons in May.During yesterday’s Commons hearing, she was criticised by Tory MP Philip Davies for heaping praise on the BBC when she is supposed to stand up for the licence fee payers.He said: ‘You started from a point of thinking how wonderful it was, and what has struck you is how even more wonderful it was than you thought it was when you first started. Have you gone native in record time?’
A BRIEF HISTORY OF DIGITAL CHANNEL BBC THREE
BBC Three has more viewers aged between 16 and 34 than any otehr youth television station including E4, Sky 1 and ITV2. Shows such as Bad Education and Being Human attract
29 per cent of this age group on a weekly basis.
Little Britain starring Matt Lucas and David Walliams (above as rubbish transvestites Florence and Emily)Since it was set up in 2003, the channel has launched shows such as Little Britain starring Matt Lucas and David Walliams and Gavin & Stacey starring James Corden.It has won four Bafta Awards and was named non-terrestrial channel of the year three times at the Edinburgh TV Festival.The channel is on air between 7pm and 4am every night. It has an audience of around a million viewers. However, Miss Fairhead insisted she would criticise the BBC where needed, and said she would encourage it to focus on putting more programmes on the Internet.
We are there to address the needs and wants of all licence-fee payers. It will require more focus online. More focus on understanding on how these viewers watch, and even catch up television. Catch up television appears to be a way the younger audience will use the BBC and view programmes
She said: ‘I think challenging the BBC executive and production teams to think about what works well online, because it is a different genre, is important.‘In the charter review, what I would expect is we would get the feedback from the younger audience and that will feed into what we think we need do as a universal broadcaster.‘We are there to address the needs and wants of all licence-fee payers.'It will require more focus online. More focus on understanding on how these viewers watch, and even catch up television.‘Catch up television appears to be a way the younger audience will use the BBC and view programmes.’Miss Fairhead’s comments come amid growing concern that younger viewers are exploiting a loophole that enables them to watch BBC shows on iPlayer for free.Currently, only those who watch TV as it is broadcast – whether on traditional TV sets or online – have to pay the licence fee.In August, Lord Hall conceded that it was ‘worth considering’ whether to change the rules to force those who watch catch-up to pay.The former controller of BBC Three, Zai Bennett, recently said the plan to close the channel – which is expected to save ?100million a year - was ‘perverse’, ‘odd’ and a ‘massive strategic mistake’.
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