单词：pre-adolescents
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Are you listening to me through headphones? Because heres a sample of what might be harming the ears of teenagers. Just kiddingthe last thing we want t
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Task3: Fighting Teen Smoking Script The percentage of teens who smoke cigarettes dropped to 28% in 2003, according to a report by the Center for Disease Control and Prevention. That was down from 36% in 1999 as measured by the Youth Risk Behavior Sur
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13.But as diet and health improved, children and adolescents have, on average, increased in height by about an inch and a half every 20 years, a pattern known as the secular trend in height. 【分析】复合句。as引导时间状语从句，主句主
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Directions: For this part, you are allowed 30minutes to write a short essay on the topicStudying Abroad. You should write at least 120words following the outline given below: 1)目前很多中国学生出国留学， 2)出国留学的好处， 3)我的
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Directions: For this part, you are allowed 30 minutes to write a short essay on the topic Studying Abroad. You should write at least 120 words following the outline given below: 1、目前很多中国学生出国留学， 2、出国留学的好处，
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研究：睡眠充足的学生成绩更优异 Students need their ZZZs to succeed Teenagers need nine hours of sleep a night and parents can help by getting them back on a school sleep schedule before classes begin, researchers suggest. Early morning
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