单词：petroleum benzene
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李阳疯狂说英语
This is Scientific Americans 60-Second Science. Im Sophie Bushwick. Got a Minute? What's the best way to find out if an unknown mixture contains a specific substance, like an environmental contaminant? You could use an expensive, bulky gas chromatogr
Scientific American(八)月
By Scott Stearns White House 24 January 2007 U.S. President George Bush wants Americans to cut their use of gasoline by 20 percent over the next 10 years. VOA White House Correspondent Scott Stearns reports, it is the cornerstone of a new energy poli
2007年VOA标准英语（一月）
Sinopec boss wins Petroleum Executive of the Year award LONDON, Nov. 12 (Xinhua) -- Chinese oil giant Sinopec's boss Fu Chengyu has been awarded the title of the Petroleum Executive of the Year in London on Monday evening by the world leading energy
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Indoor air pollution is a common threat to human health, the new study looked at five common house plants and found that when it comes to removing harmful chemicals from the air, those five plants are better than others. 室内空气污染对人类健康
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本期内容： A humble houseplant with a dash of rabbit DNA could help lower our exposure to indoor air pollution, new research suggests. Scientists have revealed that by inserting a rabbit gene into devils ivy the plant is able to clean the surrou
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