This is scientific American's 60 seconds science. I'm Sophie Bushwick, got a minute. Tens of millions of years ago, cephalopods were hiding from enemies in clouds of ink. And it turns out thatcuttlefish today producing ink that's almost identical. Re

发表于:2018-12-24 / 阅读(40) / 评论(0) 分类 Scientific American(五)月

This is scientific Americans 60 second science, I am Sophie Bushwick. got a minute. Tens of millions of years ago, cephalopods were hiding from their enemies in clouds of ink. And it turns out that cuttlefish today produce ink thats almost identical.

发表于:2018-12-24 / 阅读(29) / 评论(0) 分类 Scientific American(五)月

(WA) Human populations near the equator have evolved dark skin over many generations because of exposure to the fierce rays of the Sun. A similar phenomenon has also occurred in other parts of the animal kingdom. The African grass mouse is a good ex

发表于:2018-12-30 / 阅读(45) / 评论(0) 分类 托福听力短文

VOICE ONE: Welcome to THIS IS AMERICA in VOA Special English. Im Barbara Klein. VOICE TWO: And Im Steve Ember. Hop on -- this week our subject is motorcycles in America. (SOUND) VOICE ONE: Bikers ride under a Main Street sign welcoming them to last

发表于:2019-01-11 / 阅读(51) / 评论(0) 分类 VOA慢速英语2008年(八)月

AmericansHoldSomberObservancesofSeptember11Attacks A decade after Islamic terrorists hijacked four passenger planes and turned them into weapons to claim nearly 3,000 lives, people in the United States on Sunday somberly marked the September 11 anniv

发表于:2019-01-13 / 阅读(69) / 评论(0) 分类 VOA标准英语2011年(九月)

By Robert Berger Jerusalem 17 November 2007 The United Nations has criticized Israel's controversial separation barrier in the West Bank. As Robert Berger reports from VOA's Jerusalem bureau, Israel has rejected the report, saying the fence is vital

发表于:2019-02-06 / 阅读(52) / 评论(0) 分类 VOA常速英语2007年(十一月)