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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.
Why does Dr. Max Wintermark mention alcohol, drug addiction?
选项 A、To show there are less studies on phone addiction than on alcohol and drug.
B、To claim that phone addiction is worse than alcohol and drug addiction.
C、To suggest that we should pay more attention to alcohol and drug addiction.
D、To imply that addiction to phones are similar to alcohol and drug addiction.
答案D
解析 细节题。题干：马克斯·温特马克博士为什么提到酒精和药物成瘾?根据题干关键词“alcohol，drug addiction”定位到文章第四段最后两句“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.(这是我读到的关于网络成瘾的第一份研究。但是有许多研究将酒精、药物和其他类型的成瘾与大脑中神经递质的变化联系起来)”可知，酒精、药物和其他类型的成瘾与大脑中神经递质的变化有关。根据文章第三段可知，智能手机成瘾可能会改变你的大脑。综合以上分析可知，智能手机成瘾与酒精和药物成瘾类似，D项“暗示智能手机成瘾与酒精和药物成瘾相似”符合该意思。A项“表明对智能手机成瘾的研究少于对酒精和药物的研究”、B项“宣称智能手机成瘾比酒精和药物成瘾更严重”和C项“建议我们应该更多地关注酒精和药物成瘾”均不符合文章意思。故本题选D。
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