- 問題詳情:Bollwormsareatraditionalthreattocottoncrops.Youngonesfeedontheboll,thepartofthecottonplantthatcontainstheseeds.AbacteriumknownasBtisabletokillbollwormsandsomeotherpests.BtisshortformforBacillusthuringiensis.Itwasdiscoveredintheearlytwentiethcentu...
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