题目内容
Herbicide ____________ is achieved through the introduction of a gene from a bacterium conveying resistance to some herbicides. In situations where weed pressure is high, the use of such crops has resulted in a reduction in the quantity of the herbicides used.
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Monsanto developed Roundup, a glyphosate-based ___________ in the 1970s, and became a major producer of genetically engineered crops.
In 2017, global area of biotech crops was ________ million hectares.
In2017, the areaofbiotechcrops in the US was________millionhectares.
In2017,theareaofbiotechcropsin Brazil was________millionhectares.
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