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  3. Technology greatly helps a lot of people. Teens use computers or mobile phones to do homework, communicate and sharing pictures

Technology greatly helps a lot of people. Teens use computers or mobile phones to do homework, communicate and sharing pictures

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问题          Technology greatly helps a lot of people. Teens use computers or mobile phones to do homework, communicate and sharing pictures with their friends and to have some fun. Internet holds a huge amount of information and teenagers can get almost anything they want to know from their smart phones or computers. However, at the same time, scientists and educators become more and more concerned that the frequent use of mobile phones from an early age may lead to physical and cognitive problems.
         Our increasing dependence on smartphones has given rise to the term "nomophobia" or "no-mobile-phone phobia". If someone has nomophobia, it means that he or she feels uneasy when being unable to use mobile phones. One survey from the UK showed that 66% of respondents have some form of nomophobia and 41% of them said they had two or more phones.
         Smartphone addiction could be changing your brain. A study from South Korea conducted on teenagers showed that the brains of those who were addicted to phones had higher levels of a neurotransmitter which could lead to weak brain control and attention.
         "It’s a very small study, so you have to take it with a grain of salt," said Stanford neuroradiologist Dr. Max Wintermark, an expert who was not connected with the research. "It’s the first study that I read about internet addiction. But there are many studies that link alcohol, drug and other types of addiction to the neurotransmitter changes in the brain. "
         Another study got similar result. Too little sleep and too much screen time were clearly linked to a drop-off in cognitive skills, such as language ability, memory and the ability to finish a task, according to the report published by The Lancet Child & Adolescent Health. "We found that more than two hours of recreational screen time in children was associated with poorer cognitive development," says lead author Jeremy Walsh, a researcher at the Children’s Hospital of Eastern Ontario Research Institute.
         "Based on our findings, paediatricians, parents, educators and policymakers should promote limiting recreation screen time and prioritising healthy sleep routines during childhood and adoles cence."
         Walsh and his team looked at data—based on detailed questionnaires—for 4,520 children spread across 20 locations in the United States.
         They also tested the kids for six kinds of cognitive skills, adjusting the results for household income, puberty development and other factors that might affect performance.
         The results were measured against the Canadian 24-hour Movement Guidelines for children.
         For sleep and exercise, the recommendations align with those of the World Health Organization, but Canada is the first country to propose limits for time spent in front of a back-lit screen.
What kind of the harms of smart phones is this article mainly talking about?
选项 A、The harm to brain and cognitive health.
B、The harm to students’ testing scores.
C、The harm to physical or body health.
D、The harm to people’ sleep quality.
答案A
解析 细节题。题干：这篇文章主要谈论的是智能手机造成的哪一种危害?文章介绍了两个研究，一个是韩国的研究，证明的是智能手机对大脑的危害(第三段)，另一个是Jeremy Walsh等人的研究，证明的是智能手机对认知能力的危害(第五段)，故A项“对大脑和认知健康的危害”符合文章大意，故本题选A。B项“对学生考试成绩的危害”和D项“对人们睡眠质量的危害”在文中均未提及；C项“对身体健康的危害”只是文章内容的一部分，并不能全面概括文章内容。
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