A study of how older teenagers use social media has fou-找考题网

未分类题Despite helping to record events, photos could damage our memories. Researchers found people who take pictures have【C1】______remembering what actually happened. This phenomenon has been named 'photo-taking impairment effect'. From childrens birthdays to that long-awaited family holiday, we all want to remember those【C2】______moments with a photograph.【C3】______if youre one of those people who cant stop【C4】______beware then—you could【C5】______forgetting it all in a flash. A study has found that taking too many photos may prevent us from forming detailed memories. Researchers from Harvard University, the University of Wisconsin-Madison and Columbia University in the U.S. recently found that many people now use the Internet【C6】______a memory. They claimed that when someone wants to know something they now use the Internet【C7】______an 'external memory' just as computers use an external hard【C8】______. The study continued that we are now so【C9】______on smartphones and laptops, we go into 'withdrawal when we cant find out something【C10】______'. Far from helping us to【C11】______the moment, it could mean we miss whats going on right in front of our noses. Researchers led a group of students around a museum and asked them to either photograph or try to remember certain works of art and historical【C12】______. The next day, their memory was tested. It showed they were【C13】______at recognizing objects they had photographed than those they had only looked at. They were also poorer at【C14】______details of the objects they had taken pictures of. Dr Linda Henkel, who conducted the study at Fair field University in Connecticut, said: 'People so often【C15】______out their cameras almost mindlessly. When people rely on technology to remember for them, it can have a【C16】______impact on how well they remember their【C17】______.' Previous studies have suggested that【C18】______old photos can help us remember, but only if we spend long enough doing it. 'In order to remember, we have to【C19】______and interact with the photos, rather than just【C20】______them,' said Dr Henkel.【C1】A．puzzleB．troubleC．difficultyD．fuss

未分类题【C6】A．for fear ofB．in terms ofC．in place ofD．in the interests of

判断题科学研究简称研究，是寻求问题解释、解决的过程，这个问题可能是自然现象，也可能是社会现象或是精神现象。()

未分类题Peek through the inspection windows of the nearly 100 three-dimensional (3D) printers quietly making things at RedEye, a company based in Minnesota, and you can catch a glimpse of how factories will work in the future. It is not simply that the machines run day and night【C1】______by just a handful of technicians.【C2】______it is what they are making that shows how this revolutionary production process is【C3】______the manufacturing mainstream. 3D printers make things by building them up, a layer at a time,【C4】______a particular material, rather than【C5】______it by cutting, drilling or machining—which is why the process is also called additive manufacturing. There are many ways in which this can be done, and with only a【C6】______adjustment of software each item can be different,【C7】______the need for costly retooling of machines. This has made 3D printing a【C8】______way to make one-off items, especially prototype parts, mock-ups, small mechanical【C9】______and craft items. And that is about all that 3D printers are good for,【C10】______the doubters. Chief among them is Terry Gou, the boss of Foxconn. He thinks 3D printing is just 'a trick' without any【C11】______value in the manufacture of real finished goods, and he has vowed to start spelling his name backwards if【C12】______wrong. Mr. Gou is right about one thing: additive manufacturing is not about to replace mass manufacturing.【C13】______the technology is improving, the finish and durability of some printed items can still【C14】______what producers require. And nor can 3D printers produce millions of【C15】______parts at low cost, as mass-production lines can.【C16】______3D printers have their【C17】______which is why they are starting to be used by some of the worlds biggest manufacturers, such as Airbus, Boeing, GE, Ford and Siemens. The market for 3D printers and【C18】______is small, but growing fast. Last year it was worth $2.2 billion worldwide, up 29% from 2011. As producers become more【C19】______with the technology, they are moving from prototypes to final【C20】______.【C1】A．designedB．attendedC．introducedD．bought

未分类题【C15】A．in generalB．in briefC．in turnD．in consequence

未分类题【C4】A．dress upB．show upC．pipe upD．shut up

判断题电脑写作改变几千年来传统的写作方式。()

单项选择题人员素质测评的实施过程中，需要我们特别注意的四个问题是采用并遵守标准化的指导语、______、创造适宜的测评环境、测评双方的心理调控。

A.确定恰当的测评目的
B.确定恰当的测评时限
C.确定恰当的测评标准
D.确定恰当的测评流程

未分类题【C7】A．live throughB．give awayC．hold backD．ward off

未分类题The news about vitamins keeps getting worse. Many studies published in the last few years shows that a variety of popular supplements dont do anything to reduce the risk of developing heart disease, stroke or a variety of cancers. But what about multivitamins? These combination pills, which【C1】______10 to 30 vitamins and【C2】______, are the most popular supplements sold in America. A report published recently suggests they shouldnt be. The study【C3】______161,808 participants in the Womens Health Initiative, a long-term effort to【C4】______risk factors for cancer, heart disease and bone health in elderly women.【C5】______in the nationwide study included white, black, Asian and Native American women. They were followed for an average of nearly eight years.【C6】______, 41.5% of study participants took some version of a multivitamin. Those women were more likely to be white and college-educated, live in the West, exercise and have a lower body mass index. However, women who took multivitamins werent any more likely to【C7】______a diagnosis of breast, lung, stomach, and other cancers than were women who didnt take multivitamins. Nor were multivitamins in general helpful in【C8】______heart attacks, strokes or reducing the risk of death from any【C9】______during the study period. The research team did find one【C10】______benefit: The 3,741 women who took stress multivitamins—formulations【C11】______higher doses of several B vitamins along with an extra amount of vitamin C—were 25% less likely to have a heart attack. No other correlations between vitamins and health outcomes were statistically【C12】______. The study provides【C13】______evidence that multivitamin use has little or no【C14】______on the risk of common cancers, heart disease or total mortality in elderly women.【C15】______, researchers wondered, 'Why do millions of Americans use a daily multivitamin for【C16】______disease prevention when the supporting scientific data are weak?' Some physicians continue to【C17】______them for patients whose diets may have nutritional【C18】______. And since they dont require a prescription, many people simply【C19】______they are safe. But those assumptions may not be【C20】______, especially if people wind up overdosing on vitamins and minerals, the researchers wrote.【C1】A．generateB．representC．containD．scrape

判断题通过总结教育教学经验，既能注意教育实践中感性认识的积累和总结，又能注意教育理论指导下教育实践材料的分析研究与理性升华，提高教师的教育科学研究水平。()

未分类题Mammals vary enormously in size, from weighing less than a penny to measuring more than three school buses in length. Some groups of mammals have become very large, such as elephants and whales,【C1】______others have always been small, like primates. A new theory developed by an international team, led by Jordan Okie,【C2】______an explanation for why and how【C3】______groups of organisms are able to evolve【C4】______sizes, whereas others are not. The research team【C5】______information on how quickly an individual animal grows and used it to【C6】______how large it may get【C7】______evolutionary time. Their research was published recently. The new theory developed from the observation that some animals【C8】______fast and die young, while others take their time and mature much later. 'Fast' animals-such as mice—breed very quickly, while humans mature slowly and are relatively older when they first have children. The theory【C9】______that those species that are relatively faster are more likely to evolve a large size quicker than slow species, and that their maximum size will be greater. The research team tested their theory using the【C10】______records of mammals over the last 70 million years, examining the maximum size of each mammal group【C11】______that time, including whales, elephants, seals and primates. They found that their theory was very well【C12】______. 'Primates have evolved very slowly, and never got bigger than 1,000 pounds,' said Okie, 'The【C13】______was true of whales, which evolved their large size at the fastest【C14】______recorded.' The theory also makes predictions about the relative risks of extinction for large animals【C15】______small. The maximum size of an animal is limited by the rate of mortality in the【C16】______. Because larger animals【C17】______breed less frequently than smaller animals,【C18】______the mortality rate doubles, the maximum size is predicted to be 16 times smaller. 'This is a really surprising【C19】______,' said Okie. 'It points to another reason why many of the large animals went【C20】______after the last Ice Age, and their high risk of extinction in modern environments.'【C1】A．becauseB．whileC．ifD．and

未分类题【C18】A．in thatB．despiteC．thereforeD．if

判断题重测信度也叫稳定性系数，是估计测验跨时间的一致性的指标。用同一种测验对同一组被试先后施测两次，被试两次测验分数间的相关系数即为重测信度。()

单项选择题有一台六极三相绕线式异步电动机，在f=50Hz的电源上带额定负载运行，其转差率为0.02，电动机的同步转速为( )。 A.900r min B.1200r min C.1000r min D.1400r min

A.02，电动机的同步转速为(
B.900r/min
C.1200r/min
D.1000r/min
E.1400r/min