Although one can adduce myriad of examples of ecosystem disruptio

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Although one can adduce myriad of examples of ecosystem disruption by nonindigenous species, nevertheless most introduced species that survive in fact appear to have quite _____ effects on the ecosystem they have invaded.

A、minimal
B、trifling
C、marked
D、conspicuous
E、intriguing
F、deleterious

答案：A,B

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