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Lesson 1 Finding fossil man 发现化石人 First listen and then answer the following question. 听录音，然后回答以下问题。 Why are legends handed down by storytellers useful? We can read of things that happened 5,000 years ago in the Nea
新概念英语第四册
Oil is good and bad. Its good because it helps our energy needs. Its bad because it causes pollution. Oil is a fossil fuel. Burning it produces carbon dioxide (CO2). This is one of the biggest causes of global warming. There isnt much oil left in the
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By Greg Flakus Houston 28 August 2007 Lucy fossil display The fossilized bones of a female hominid creature found in Ethiopia in 1974 and today known around the world as Lucy are now in the United States on an unprecedented tour. The bones are part o
2007年VOA标准英语（八月）
Researchers get same yields with fewer fertilizers, pesticides Steve Baragona | Washington, DC 18 May 2010 Fossil energy use was compared among different crop rotation systems in a field experiment conducted between 2003 and 2008 in Boone Co., Iowa R
VOA标准英语2010年(五)月
Oil is good and bad. Its good because it helps our energy needs. Its bad because it causes pollution. Oil is a fossil fuel. Burning it produces carbon dioxide (CO2). This is one of the biggest causes of global warming. There isnt much oil left in the
纯正英语一分钟
By Caroline Sawyer Nairobi 08 August 2007 One of the world's oldest hominid fossils, which revolutionized theories of early man, has left Ethiopia to begin a controversial tour of the United States. Anthropologists want the remains of the fossil, kno
2007年VOA标准英语（八月）