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 are essential in an ecosystem because to other living creatures they are______.
选项
答案E
解析 根据第三段第一句话“Plants make up the biggest group of biological creatures within anecosystem，and that’s because they are the natural food producers for everyone．”可知，植物是有生命的生物的食物来源，所有它们对生态系统很重要，所以本题选E。
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