In the 24 years since the birth of Louise Brown,the world's first test-tube baby,thousands of would-be parents have been assure that as far as scientists knew there was no extra risk of genetic damage associated with in-vitro fertilization,

发表于:2018-12-05 / 阅读(32) / 评论(0) 分类 有声杂志阅读

[00:05.30]Seven environmental activists from all over the world have received this year's Goldman Environmental Prize. [00:15.39]The winners were awarded 125,000 dollars each by the Goldman Environmental Foundation. [00:24.24]The awards were announce

发表于:2018-12-26 / 阅读(66) / 评论(0) 分类 美国英语听力80篇

She chews its tail first, to make sure the fish can't get away. While the pups are still demanding milk, the mother otter will often keep the whole fish for herself. Her pups are happy enough with caviar. As the flow becomes slow enough for the trout

发表于:2019-01-22 / 阅读(33) / 评论(0) 分类 自然百科2012年

55 肯塔基州的母马不育症 DATE=6-7-01 TITLE=SCIENCE REPORT - Mare Reproductive Loss Syndrome BYLINE=George Grow (Start at 59

发表于:2019-01-30 / 阅读(65) / 评论(0) 分类 科技之光

DEVELOPMENT REPORT – July 1, 2002: Reproductive Health Report 28 Jun 2002, 21:24 UTC This is the VOA Special English Development Report. A new report has been released about sexual and reproductive

发表于:2019-01-30 / 阅读(49) / 评论(0) 分类 农业与发展

10 Worst States To Be a Woman State Republicans have introduced nearly 1,000 laws restricting women's reproductive health access. Here are 10 of the worst states to be a woman between puberty and menopause. In a time of war and record unemployment, t

发表于:2019-02-18 / 阅读(225) / 评论(0) 分类 阅读空间