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英語學(xué)習(xí)論壇的“聽力練習(xí)區(qū)”正式與大家見面啦。歡迎大家來這里練習(xí)聽力，交流經(jīng)驗(yàn)，共同進(jìn)步。
本練習(xí)區(qū)的音頻文件選自英語點(diǎn)津的“聽中國(guó)日?qǐng)?bào)”、“VOA常速”、“流行金曲”及“名人演講”等欄目，題材豐富，難度各異，適合不同階段的英語學(xué)習(xí)者。
英語點(diǎn)津會(huì)定期發(fā)布音頻材料，大家可以在跟帖中貼出自己聽寫出的音頻文字稿。每個(gè)音頻材料的標(biāo)準(zhǔn)文字稿會(huì)在帖子發(fā)布兩天后公布。
This is the VOA Special English Agriculture Report.
American farmers first planted genetically engineered crops in 1996. Today 80 percent of the cropland for soybeans, maize and cotton in the United States is transgenic. Genetic engineering adds or changes genes in a plant to produce desired qualities.
The United States is one of 25 countries where farmers planted genetically engineered crops in 2009. An agricultural biotechnology group says planting decreased in Europe. But the amount of cropland planted with the crops rose by an estimated seven percent worldwide.
The National Research Council, part of the National Academies in Washington, recently published a study. The study examined how genetically engineered crops have affected farming in the United States. It found that many farmers have better harvests, better weed control and fewer losses from insect damage compared to traditional crops.
LaReesa Wolfenbarger is a University of Nebraska biology professor and a member of the committee that wrote the report. She says they found that genetically engineered crops can be better for the environment.
LAREESA WOLFENBARGER: "In general, we find that genetically engineered crops have had fewer adverse effects on the environment than non-GE crops produced conventionally."
For example, she noted that crops designed to resist damage by glyphosate need fewer pesticides that are more toxic to the soil. Glyphosate is a chemical used in Round-Up and other weed killing products.
But some farmers have used so much glyphosate that a number of kinds of weeds can now resist it. David Ervin of Portland State University in Oregon led the committee that wrote the report. Professor Ervin says this means that some farmers are again using the more toxic herbicides to control weeds. He says the problem needs immediate attention.
Earlier this year, a professor at the University of Western Australia commented on the overuse of glyphosate. Stephen Powles wrote about it in the Proceedings of the National Academy of Sciences in the United States. He said glyphosate is as important in worldwide food production as penicillin is in medicine for fighting disease. He called for better use of glyphosate-resistant crop technology.
And that's the VOA Special English Agriculture Report, written by Jerilyn Watson, with additional reporting by Steve Baragona. I'm Bob Doughty.
glyphosate: 草甘膦
（來源：VOA 編輯：陳丹妮）
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