The woolly mammoth was a very large elephant-like mammal that lived on Earth several thousand years ago. Some mammoths grew to be four meters high and the largest weighed almost nine tons. Both male and female mammoths had very large tusks and walked

发表于:2018-12-03 / 阅读(29) / 评论(0) 分类 轻松英文阅读

[00:05.49]Physical changes, such as gray hair and small lines on the face, appear as we grow older. [00:15.78]Now, American scientists say such changes may result partly from changes in our genetic material. [00:24.24]They say these genetic mutations

发表于:2018-12-26 / 阅读(27) / 评论(0) 分类 美国英语听力80篇

SCIENCE IN THE NEWS - Genetic Map of Chimps May Show What Makes Us Human By George Grow, Cynthia Kirk and Jerilyn Watson Broadcast: Tuesday, September 20, 2005 (MUSIC) VOICE ONE: This is SCIENCE IN TH

发表于:2019-01-02 / 阅读(51) / 评论(0) 分类 科技之光

VOICE ONE: This is SCIENCE IN THE NEWS, in VOA Special English. I'm Barbara Klein. VOICE TWO: And I'm Steve Ember. On our program this week, we will tell about an animal that can reproduce without mating. We also will tell about a Swedish man who d

发表于:2019-01-11 / 阅读(92) / 评论(0) 分类 VOA慢速英语2007年(六)月

36 反口蹄疫的疫苗 VOICE ONE: (Start at 1'00

发表于:2019-01-30 / 阅读(44) / 评论(0) 分类 科技之光

AGRICULTURE REPORT – April 9, 2002: Genetic Engineering Debate By George Grow This is the VOA Special English AGRICULTURE REPORT. An international debate continues about genetically engineered corn.

发表于:2019-01-30 / 阅读(42) / 评论(0) 分类 农业与发展