题目

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。Cassie lived a lonely life. She would wander through the forest, eating 【1】 (fall) fruits while other birds flew among the trees.“Why cannot you fly?” they would ask. “Your weak little 【2】 (wing) cannot even lift you off the ground!” they would tease her. “You’re 【3】 shame to birds,” they would offend her.Cassie was feeling increasingly frustrated and 【4】 (use), so she made up her mind to leave the forest for good. Just as she walked free from trees, she heard a d根据下图所示二氧化碳和氧气的性质实验，请回答以下问题。(1)A装置进行实验后，迅速盖上瓶盖振荡，观察到_______现象。利用二氧化碳的这一性质，可以用于_______(填字母)。A．灭火 　　 B．生产饮料 　　C．光合作用 　 D．气体肥料(2)通过B装置进行实验的现象，证明该集气瓶中的气体是_______。(3)C装置中发生反应的文字表达式为_______。