[有机化学] 活泼氢化合物

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

发表于:2018-12-24 / 阅读(37) / 评论(0) 分类 Scientific American(八)月

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

发表于:2018-12-29 / 阅读(45) / 评论(0) 分类 新视野大学英语:视听说教程 3

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

发表于:2018-12-30 / 阅读(29) / 评论(0) 分类 考研英语长难句讲解

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

发表于:2019-01-03 / 阅读(53) / 评论(0) 分类 四六级写作指导

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,

发表于:2019-01-08 / 阅读(38) / 评论(0) 分类 英语四级作文范文

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

发表于:2019-02-21 / 阅读(35) / 评论(0) 分类 阅读空间