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If ______ some plants are closely related to t
问题详情
If ______ some plants are closely related to the species they replaced, their use was probably based on ______.请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：botanical observation
botanical observation 解析：(第三段中间部分提到These plants are not closely related to the species they replaced, so their use was not based on botanical observation. 题干陈述是此说法的反义表述。)
