【科学60秒】有一种变态叫无敌_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】有一种变态叫无敌

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One of the concerns about ___1___ genetically modified crops has been that vegetation growing in agricultural fields might escape out into the world. Now, for the first time in the U.S., researchers report a large population of ___2___ beyond the farm.
Transgenic canola plants in North Dakota had received genes making them resistant to herbicides, such as the ___3___ killer Roundup. Researchers collected and tested 406 canola plants along thousands of miles of state roads. They found 347 carrying at least one resistance gene. There were also indications that the inserted genes were being passed on to new generations, producing some plants in the wild with multiple transgenes. The findings were presented on August 6th at the annual meeting of the Ecological Society of America in Pittsburgh.
The transgenic canola plants are not about to ___4___ the world. But researchers are obviously curious about how these particular plants managed to make it in places like the edges of parking lots rather than ___5___ fields. Any answers they find will likely affect future biotechnology regulation.