2. 外语
  3. 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.

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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