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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。()

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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The average British people get six-and-a-half hours sleep a night, according to the Sleep Council. It has been known for some time that the amount of sleep people get has,【C1】______declined over the years. But【C2】______the average amount of sleep we are getting has fallen, rates of obesity and diabetes have soared. Could the two be connected? We wanted to see what the【C3】______would be of increasing average sleep by just one hour. So we asked seven volunteers, who【C4】______sleep anywhere between six and nine hours, to be【C5】______at the University of Surreys Sleep Research Centre. The volunteers were randomly【C6】______to two groups. One group was asked to sleep for six-and-a-half hours a night, the other got seven-and-a-half hours. After a week the researchers took blood tests and the volunteers were asked to switch sleep【C7】______. The group that had been sleeping six-and-a-half hours got an【C8】______hour, the other group slept an hour less. Computer tests designed to measure brain wave activity【C9】______that most of them struggled with mental agility tasks when they had less sleep, but the most interesting results came from the blood tests that were【C10】______. Dr Simon Archer and his team at Surrey University were【C11】______interested in looking at the genes that were switched on or off in our volunteers【C12】______changes in the amount that we had made them sleep. 'We found that【C13】______there were around 500 genes that were affected,' Archer【C14】______. 'Some which were going up, and some which were going down.' What they discovered is that when the volunteers【C15】______back from seven-and-a-half to six-and-a-half hours sleep a night, genes that are【C16】______with processes like immune response and response to stress became more【C17】______The team also saw increase in the activity of genes related to diabetes and risk of cancer. The【C18】______happened when the volunteers added an hour of sleep. So the clear【C19】______from this experiment was that if you are getting less than seven hours sleep a night and can alter your sleep habits, even one hour more, it could make you【C20】______.【C1】A.by chanceB.on averageC.at lengthD.for good