B If I could have your attention, I'd like to talk to you about young people's screen time. It's a tempting habit for them to glance at their smartphone or tablet rather than make eye contacts with someone and make conversations! There is so much to look at: photographs, social media feeds messages and emails; it's no wonder they are glued to their screens. But is it good for them? There have been many claims about the damage looking at screens does to our eyesight. Some people feared staring at a small bright box could make us short-sighted or lead to headaches. This is a particular concern for children and young people, who spend a higher percentage of time using electronic gadgets. BBC technology corespondent, Rory Cellan-jones, says: “There is plenty of anecdotal evidence that no matter how long teenagers are spending looking at screens. they are encountering material about issues such as anorexia (厌食症) and self-harm that could prove damaging to their mental health.” But a new study says time in front of computers and phones might not be as bad for young people as many think. Research by the Oxford Internet Institute examined data from more than 17.000 teenagers in the UK. Ireland and the United States. Their study concluded that most links between life satisfaction and social media use were trivial" accounting for less than 1% of a teenagers health. Professor Przybylski, director of the research at the institute, said: 99.75 of a persons life satisfaction has nothing to do with their use of social media. " The research found that family, friends and school life all had a greater impact on well-being. Perhaps for now, deciding what the "right" amount of screen time is has to be up to personal judgments. 35. The first paragraph is designed to _____.
我国保护少年儿童权益的专项法律是《中华人民共和国未成年人保护法》。（ ）
MP3（ ）。
计算机软件是指（ ）。
下面哪一项不属于维护交易安全原则的内容？（ ）
围绕《建国以来的重大科技成就》一课，做一个教案。
请围绕“城乡发展一体化”写一篇小论文，题目自拟，角度不限，要求：结构完善、条理清晰、有说服力。
在国际关系中，第三世界国家历来是中国团结合作的对象，因为 ①第三世界国家是国际社会一支重要的政治力量 ②团结第三世界国家符合中国的国家利益 ③合作是第三世界国家共同发展的必由之路 ④第三世界国家在南北关系中处于主导地位（ ）
微观经济学要解决的问题是（ ）
机关文书部门或业务部门在年终或第二年上半年对归卷的文件材料进行整理等工作，称为（ ）。
20世纪70年代中国外交有了重大突破和转机，转变的关键是（ ）
