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
In an ecosystem, plants, animals and humans live together in______.
选项
答案C
解析 根据第一段第一句话“An ecosystem is where living creatures expand within a given area．”可知，生态系统就是所有生物在一个给定区域共存，所以本题选C。
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