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题目内容
Because it has usually been impossible to eradicate exotic species once they have become established, it is ____________ to minimize introductions of species that have substantial probabilities of unwanted impacts.
- Aprudent
- Bcustomary
- Cprovident
- Dsuperfluous
- Eessential
- Fpointless
A,C显示答案
以上解析由 考满分老师提供。