近年来，被称为生态杀手的北美一枝黄花先后在沪、苏、浙、赣等地

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近年来，被称为生态杀手的“北美一枝黄花”先后在沪、苏、浙、赣等地迅速蔓延，严重
影响原有植被。其根本原因是（）

A．这些地区气候湿润，适宜其生存

B．该地区土壤呈酸性，适宜它生长

C．这一外来物种在该地区没有天敌

D．这一外来物种在该地区发生了变异

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