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Passage1Children who spend more than two hours a day at a computer or watching television are more likely than others to have mental problems，scientists say.Researchers found that 11-year-olds who spent several hours in front of a screen each day did worse on mental health tests，no matter how much physical exercise they got. The University of Bristol study，published in Pediatrics，involved more than 1，000 children aged about 10.They also had the kids fill out questionnaires designed to gauge the kids' emotional well-being and behavior.The questionnaires contained 20 questions covering five sections-emotional difficulties，conduct problems，hyperactivity or inattention，friendships and peer groups and problems relating to friends and peer groups.The study found no direct evidence that sitting in front of a screen actually causes mental health problems. Instead，it suggests that children with difficulties，such as extreme shyness，are more likely to choose TV or computer games than sociable activities. In the study，children were asked whether they agreed，disagreed or somewhat agree with a list of statements，including，"I generally play alone or keep to myself" and，"I am often unhappy or tearful".They were also asked how much exercise they took and how long they spent at a TV or computer screen.According to the study，children who spent more than two hours a day at a screen had a 60% higher risk of mental problems than children who spent fewer viewing hours. The risk was only slightly higher in children who did little or no exercise."Physical activity is good for health in many ways，but it can't make up for long hours of screen viewing. Parents should consider limiting their children's screen viewing to no more than 2 hours a day，”said the study organizer，Angie Page.Previous studies have raised concerns that watching too much television can affect children's behavior in later life. A Canadian study found that those who watched most TV as young children performed worse at school, ate more junk food and had more trouble concentrating.What is the passage mainly about?
78×78×78×……×78（1995个78）的积的个位上的数字是几？（ ）
事故调查处理的“四不放过”的原则是什么？（）
在未清洁、大面积开放、新鲜的手部创伤，止血主要靠（）。
中国的诗歌传统是讲求韵律，这一点，不论是民歌还是魏晋、唐宋的文人诗词，以至近现代的。白话诗，以不同的形式保持这种传统的，都被认为是具有中国特色的（）。
社会工作理论在社会工作实务中的作用主要包括（）
疮疡漫肿无头，部位较深，皮色不变，不热少痛者为（ ）。
封发，是指将（）处理好的邮件，按照发运频次、时限的规定和发运路线、寄达局，逐格整理、捆扎、封装成袋、套。抄登封发邮件清单、路单，交运输部门发运的生产过程。
中国是一种整体主义的文化，个人是工具。
消防员呼救器后场接收装置备标准为1套/攻坚组，备份为1套
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