Lesson 13 Text A Give Me a Big Box of Chocolates John liked chocolates very much, but his mother never gave him any, because they were bad for his teeth, she thought. But .)ohn had a very nice grandfa

发表于:2018-11-27 / 阅读(214) / 评论(0) 分类 新概念英语青少版

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Batteries of the future need to deliver more energy, and they need to be smaller. Researchers at MIT think they have developed a technology that can, a

发表于:2019-01-08 / 阅读(78) / 评论(0) 分类 Scientific American(四)月

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Common batteries are electrochemical cells. And they may get better thanks to living cells: the multicellular organism called brown algae. Lithium ion

发表于:2019-01-08 / 阅读(81) / 评论(0) 分类 Scientific American(九)月

When I was a little girl, I found love in a box all because of a class assignment. On a Friday night I made an announcement at the dinner table. The words bubbled out in a torrent of excitement I could no longer contain. My teacher said we have to br

发表于:2019-02-06 / 阅读(81) / 评论(0) 分类 阅读空间