A. our share of resources B. a biological creature C. a given area D. the maintenance of the ecosystem E. the source of food F.

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问题 A. our share of resources B. a biological creature
C. a given area D. the maintenance of the ecosystem
E. the source of food F. various species
Plants, animals and humans are all effective in______.

选项

答案D

解析 根据第四段最后一句话“Since plants,animals and humans are all of various species(物种),weall play a role in maintaining the ecosystem.”可知,植物、动物和人类在维持生态系统中发挥着重要作用,所以本题选D。
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