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  3. Although one can adduce myriad of examples of ecosystem disruption by nonindigenous species, nevertheless most introduced specie

Although one can adduce myriad of examples of ecosystem disruption by nonindigenous species, nevertheless most introduced specie

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问题 Although one can adduce myriad of examples of ecosystem disruption by nonindigenous species, nevertheless most introduced species that survived in fact appear to have quite________effects on the ecosystem they have invaded.
A. marked
B. conspicuous
C. minimal
D. intriguing
E. trifling
F. deleterious
选项
答案C,E
解析 两句话的逻辑连接词为although，引导让步转折，让步的部分与转折的部分取反。句中的nonindigenous species(非本土物种)与introduced species(被引进的物种)都是指入侵物种，为同义对应。转折的部分要填入一个形容词，表示引进的物种对于它们所入侵的生态系统造成的影响的程度。让步的部分说，有人举例说这些入侵物种对生态系统有破坏的作用；转折的部分则应该说这些物种实际上对于它们所入侵的生态系统的影响不具有破坏性，或者影响很小，所以选C项minimal，E项trifling (微不足道的)。
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