—Could I invite my friends to my birthday party?—Sorry, you ______.A．canB．can’tC．couldD．couldn’t-九年级

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• 如图一表示某生态系统中的食物网；图二表示的是某条食物链中三种生物体内所含有机物总量的直方图．请据图回答下列问题：（1）作为一个完整的生态系统，图一中缺少的生物成分是__-八年级生物
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• 如图为一个草原生态系统的一角：蝴蝶在花草间飞舞，蜜蜂在采食花粉和花蜜，蝗虫和蝴蝶的幼虫在啃食草叶，蚂蚁在忙碌地往洞穴中搬运草籽，而蜘蛛却张开了大网，等待那些没有意-七年级生物
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