1 . _____ (bacterium) reproduce by dividing and making copies of themselves. (所给词的适当形式填空)
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2 . For example , pesticides can damage the land by killing not only harmful _______ (bacterium) and insects , but also helpful ones . (所给词的适当形式填空)
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3 . Until now, it is still unknown to the scientists which _____ (细菌) causes the infection.(根据汉语意思填空)
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