This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. When it comes to handedness, righties rule. And according to a new study, they have for a long time, because even half a million years ago, nine out of 10

发表于:2018-12-24 / 阅读(38) / 评论(0) 分类 Scientific American(四)月

This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. Many of the key molecules for life have a specific direction, or handedness: DNA twists to the right, amino acids to the left. Now scientists at the Nation

发表于:2018-12-24 / 阅读(44) / 评论(0) 分类 Scientific American(四)月

[00:05.49]Why are some people left-handed? [00:09.09]Scientists have been trying to answer that question for many years. [00:14.32]Research has shown that ninety percent of people naturally use their right hands for most tasks. [00:22.94]But hundreds

发表于:2018-12-26 / 阅读(21) / 评论(0) 分类 美国英语听力80篇

By Mary Morningstar Washington 15 April 2008 Humble, unassuming and reliable are words often used to describe Country legend George Strait. Since 1981, the 55-year-old Texan has sold close to 70 million albums worldwide and collected over 50 major in

发表于:2019-02-06 / 阅读(86) / 评论(0) 分类 VOA常速英语2008年(四月)

经过对剑桥雅思听力题的总结,我们发现,许多题目存在着比较关系,破解了题目中的比较关系,也就可以正确解题。下面,我们就来为大家讲一讲雅思听力题中的比较关系。 在这里,我们把

发表于:2019-02-09 / 阅读(77) / 评论(0) 分类 雅思英语

新GRE阅读主要考验我们逻辑推理能力,在中国很少进行着方面的训练。逻辑推理能力在阅读中考察,从宏观上把握文章,抓住文章的主体结构是关键。下面为大家进行3种常见的GRE阅读主题结构

发表于:2019-02-17 / 阅读(32) / 评论(0) 分类 GRE英语