【单选题】Plants and Mankind Botany, the study of plants, occupies a peculiar position in the history of human knowledge. We don't know what our Stone Age ancestors knew about plants, but from what we can obser...
【单选题】根据材料请回答 16~22 Plants and Mankind Botany, the study of plants, occupies a peculiar position in the history of human knowledge. We don't know what our Stone Age ancestors knew about plants, but from wha...