单词：cephalosporium chrysogenum
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These holes are the unmistakable hallmark of a violent death. Their shape suggest they were made by the teeth of a big cat, but which one? Today theres only one large cat in the region, the Florida panther. Though similar to the cougar at the western
探索与发现2012年
But how did one man and a spear produce the huge force behind this blow? The answer lies with small bits of ivory like this. They were once part of an atlatl, or spear thrower. An atlatl acts as a sort of catapult, magnifying the strength of a hunter
探索与发现2012年
By piecing together the evidence these creatures left behind, we can build a picture of this sub-tropical corner of the continent as it was 13,000 years ago. While most of North America was still in the grip of the Big Freeze, Florida was an ice age
探索与发现2012年
This is Florida, a taste of the tropical, one of the world's most popular holiday destinations. Here mankind's unquenchable desire to explore and colonise reaches astronomical proportions. Eight, seven, six, five, four, three, two, one. Ignition. Lif
探索与发现2012年
This creates steam in oasis and a profusion of life. Today, these warm springs are a refuge for one of Florida's most tropical inhabitants. The West Indian Manatee wasn't present during the last ice age, but returned here as the waters warmed up. Eve
探索与发现2012年
Online Classes May Force Changes at Universities This is pretty amazing, said the University of Virginia's David Evans, teaching an online introduction to Computer Science. Online classes are now taught by many top universities and offer everything f
VOA标准英语2013年(六月)
This triggered other dramatic changes. As sea levels dropped, so did the inland water tables. Florida's fresh water drained away through the porous limestone rock. Pools dried up and springs diminished. Florida was on the brink of drought. And animal
探索与发现2013年
Grammar Girl here. Today guest-writer Bonnie Trenga will help us talk about which clauses and whether its OK to start a sentence with oneor a new paragraph. Incomplete Sentences Sentences that are missing something, such as a subject or a predicate,
英语语法 Grammar Girl
By Lisa Bryant Aulnay-sous-Bois, France 11 January 2006 Two months after the worst riots in nearly 40 years swept across France, life is back to normal. There are few traces of the rioting and arson a
2006年VOA标准英语（一月）
By Alan Silverman Hollywood 02 April 2006 It's back to prehistoric times for a sequel to the 2002 computer-animated family film that featured a grumpy mammoth and his traveling companions: a quick-wit
2006年VOA标准英语（四月）
By Lisa Bryant Paris 22 November 2006 France's top anti-terrorist judge has requested arrest warrants against nine senior Rwandan officials linked to a 1994 attack that killed former Rwandan President Juvenal Habyarimana. The warrants, which are exp
2006年VOA标准英语（十一月)
Ocean Floor Reveals Past Climate Changes Time capsule Lamont research professor Maureen Raymo, the director of the Core Repository, slides open a long, narrow drawer from the cabinet. Like thousands of others here, the drawer contains a long, thin cy
VOA标准英语2012年(一月)
Supernatural Romance, Action Attract All Ages In the Houston suburb of Tomball, these women get together frequently to socialize and chat about the books they are reading. Cathy Clark says many of those books - targeted at teens - also attract adult
VOA标准英语2012年(三月)
The Science of Climate Change Climate negotiators are meeting in Durban, South Africa beginning from November 28-December 9 to discuss the planet's changing climate. The first decade of this century was the hottest on record. Polar ice is melting. Gl
VOA标准英语2011年(十一月)
Though very powerful, shes not a sprinter and she needs to get close to her prey before she strikes. This time shes run too soon and its a fruitless chase. Then her attention is diverted to a slower-moving target, slow but not defenseless. She backs
探索与发现2013年
By Mike O'Sullivan Los Angeles 03 March 2008 Among the 25,000 people who ran in Sunday's Los Angeles Marathon, runner Julian Myers joined in the race for five kilometers. Mike O'Sullivan reports, it was part a bigger marathon to mark his 90th birthda
VOA标准英语2008年（三月）
SCIENCE IN THE NEWS - November 12, 2002: Oldest Evidence of Jesus? / Mapping Genes that Cause Disease / 2002 World Health Report VOICE ONE: This is Steve Ember. VOICE TWO: And this is Bob Doughty with
科技之光
By Mil Arcega Washington, DC 03 November 2006 watch Bectel Iraq report Rebuilding Iraq U.S.-based engineering firm Bechtel Corporation says it is pulling its employees out of Iraq now that its three-year contract to rebuild the war-torn country has
2006年VOA标准英语（十一月)
By Mike O'Sullivan Los Angeles 16 November 2007 Auto makers who are showcasing their latest models at the Los Angeles auto show are expanding product lines in the hope of staying competitive in a changing market. Mike O'Sullivan reports, carmakers fr
VOA常速英语2007年（十一月）
By Franz Wild Abidjan 09 November 2006 Last week five died in Ivory Coast during battles between a militia and the local population. Some say this kind of violent disorder has been planned. Herv Tailly watches the images of the burning camp on his m
2006年VOA标准英语（十一月)