单词：codeic acid
单词：codeic acid 相关文章
HEALTH REPORT - October 23, 2002: Folic Acid Reduces Fetal Deaths By Nancy Steinbach This is the VOA Special English Health Report. A new study in Sweden has confirmed another important health effect
健康与环境
This is Scientific American's 60-Second Science, Im Steve Mirsky. Got a minute? Biologists often attempt to construct a genealogy that shows the relationships of all life on earth. One well-accepted effort compares the nucleic acid sequences that cod
Scientific American(五)月
Where Do We Come From? 我们来自哪里? Would you like to know where your ancestors came from? British and American scientists may have found answers for you. They have developed a new algorithm to study deoxyribonucleic acid, also known as DNA --
2014年VOA慢速英语(八)月
Folic Acid Supplements Shown To Reduce Risk Of Autism Green, leafy vegetables, fruits and nuts naturally contain folate, a B vitamin that helps the body make healthy new cells. Most pre-natal vitamins include folic acid because it protects against de
VOA标准英语2013年(四月)
By Melinda Smith Washington, D.C. 07 June 2007 For years, doctors urged women to take folic acid if they planned to get pregnant. Then researchers discovered the nutrient helped reduce the risk of a heart attack. But now a new study shows folic acid
2007年VOA标准英语（六月）
一条巷子，五户人家，外加八婆和熟女，就组成了全美收视冠军：Desperate Housewives。这部美剧不仅剧情跌宕起伏、帅哥美女遍地，而且还有很多地道的英语表达，我们一起来学习吧! 1. The bank
英语口语