单词：electronic switching element
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Fossils found at Weng'an in Guizhou Province are regarded as the oldest ones to be found in the country, if not the world. Recently, a group of paleontologists gathered at the site to call for more protection of animal fossils that could provide clue
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Environmental Protection Today on Congressional Moment. Voice2: Only within the moment of time represented by the present century, has one species man acquired significant power to alter the nature of his world. ANNCR: That was from Rachel Carson's 1
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The future of our planet is at stake. If we do not act now, We may never be able to save the earth. There is good news too: we can make a difference. We may think that what we do in our everyday life has no effect on big problems, such as environment
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Part6Noise Pollution 噪音污染 Noise is among the most pervasive pollutants today. Noise from road traffic, jet planes, jet skis, garbage trucks, construction equipment, manufacturing processes, lawn mowers, leaf blowers, and boom boxes, to name a fe
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Scott Stearns President Bush marked Earth Day with a new program to better protect American wetlands. The president's presumptive Democratic challenger, Massachusetts Senator John Kerry said that Mr.
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