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.

admin2014-03-28  80
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。
转载请注明原文地址:https://kaotiyun.com/show/eUQd777K
本试题收录于： 职称英语理工类C级题库职称英语分类
0

职称英语理工类C级

职称英语

相关试题推荐
随机试题
最新回复(0)