标签：Stem 相关文章
By Efam Dovi Accra 12 June 2006 In Ghana, about 20 percent of teenage girls drop out of school, or fail to finish their exams. Authorities say many of them leave school because they have become pregnant. Activists say the girls are ostracized by soc
发表于:2019-01-09 / 阅读(104) / 评论(0)
2006年VOA标准英语（六月）
2006年VOA标准英语（六月）
By Sabina Castelfranco Rome 20 January 2006 As concerns over the spread of bird flu increase, Italian police have stepped up controls at sites that could be at risk. Thousands of chickens and eggs wer
发表于:2019-01-13 / 阅读(114) / 评论(0)
2006年VOA标准英语（一月）
2006年VOA标准英语（一月）
Scientists Regrow Tissue Killed During Heart Attack U.S. scientists have done what was once considered science fiction - regrown heart muscle to replace tissue that was killed off in a heart attack. It's the latest advance in the field of regenerativ
发表于:2019-01-14 / 阅读(73) / 评论(0)
VOA标准英语2012年(二月)
VOA标准英语2012年(二月)