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以疾病特性命名的疾病是
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不是丹毒的病因病机的是
肿疡的基底根部称为
Australian children are visiting social media websites at an increasingly younger age, a new survey suggests, with one in five "tweens" (children between the ages of about 10 and 14) admitting they have chatted to someone online they do not know. The report "Tweens, Teens and Technology" by online security company McAfee found that children in the tweens age【C1】______of 8 to 12 were【C2】______technology faster than expected, with 67 percent using a social media website..【C3】______the age eligibility for Facebook being 13, one in four (26 percent)【C4】______using the site— although 95 percent said they had their parents"【C5】______to do so. The most【C6】______site for tweens was Skype (used by 28 percent),【C7】______children were also using Instagram, according to the survey of 500 youngsters geographically【C8】______of Australia"s online population.【C9】______the survey found that one in five tweens (19 percent) said they chatted to someone online that they did not know,【C10】______seven percent said they had shared personal information. Australia"s Communications Minister Stephen Conroy said it was【C11】______that children talk to strangers online. "It shows we must remain【C12】______to online threats," he said. The findings suggest the age at which children first use social media is【C13】______, given a 2012 McAfee survey of teens aged 13-17 found the average age they opened their first social network【C14】______was 13. On average, tweens were using three or four devices that can be Internet【C15】______, with 66 percent of them【C16】______mobile phones and/or tablets. Fifty-four percent said they used a tablet for more than an hour a day. Most tweens use their devices to【C17】______the Internet, and on average spend about 1.5 hours a day browsing the web, the survey said. "Both parents and schools are encouraged to keep a close【C18】______on their child"s online behavior to ensure they have safe online【C19】______," said Andrew Littleproud, president of McAfee Asia-Pacific. "By working closely with child psychologists, we have seen that online behaviors firmly set in the tween age group so active education is【C20】______within eight to 12 age bracket." 【C20】
Going hungry is a major contributor to ill health, particularly among children, and a new report reveals how long-lasting the damage can be. Researchers at the National Cancer Institute (NCI) and the University of Calgary performed the first longterm study on the【C1】______of hunger on general health,【C2】______children from birth to 21 years. Most studies to date have【C3】______only snapshots of childhood health,【C4】______the short-term impact of hunger【C5】______a period of time. In the new analysis, the scientists found that children who went hungry at least once in their lives were 2i-times more likely to have【C6】______overall health 10 to 15 years later, compared with those who never had to【C7】______food. "Our research shows that hunger and food insecurity are really damaging【C8】______children"s life chances," says lead author Sharon Kirkpatrick, a visiting fellow at NCI. The study supports earlier findings that【C9】______episodes of hunger are more likely to cause ill health than an isolated experience of starvation: children in Kirkpatrick"s analysis who experienced two or more periods of hunger were more than four times as likely to report ill health than those who never went hungry. The relationship, she says, remained strong even after the team accounted【C10】______other factors that could influence health, such as age, sex and household characteristics like income. 【C11】______one experience of hunger can have lasting effects on a child"s health, a fact that is especially troubling in light of the sobering rise in U.S. households that were【C12】______to do without food in 2008: 15% of American families reported some【C13】______in the amount or quality of food they consumed,【C14】______from 11% the previous year. 15 this study did not probe into the【C16】______mechanism by which hunger affects long-term health, Kirkpatrick【C17】______that both psychological and physiological factors may be at work. Aside from the obvious negative impact that missing key nutrients and calories can have on growth and development, she says, the psychological【C18】______of food insecurity—not being able to afford a【C19】______and high-quality source of food—can be【C20】______to youngsters as well. 【C18】
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