The number of the women teachers ______ 80 last term in our school. [ ]A. isB. are C. was D. were -九

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• 某草原生态系统中各成分之间的关系如图所示．请回答：（1）图中的植物是生态系统中的______者，动物是生态系统中的______者．（2）生态系统通过食物链和食物网进行着能量______和物-生物
• 根据下面的图示，判断说法正确的一组是（）A．图一所示图“大气”的成分是氧气，生态系统中的能量流动方向是动物到植物、微生物到动物、微生物到植物B．图二表示用显微镜观察洋葱鳞-生物
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• 如图示某两地生态系统中的甲、乙两个食物网，请根据所学知识回答问题．（1）甲和乙两图所示部分都不能称为生态系统，原因是______；在各自的生态系统中甲和乙的生产者都是_____-生物
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• 图是大金湖湖泊生态系统，请据图回答问题：（1）影响该生态系统生物生存的非生物因素有______（举一例）；（2）该生态系统中的生产者有______，未标注的生物部分是______；（3）螺蛳的-生物
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