题目

完形填空；从A、B、C、D四个选项中选择填入空白处的最佳答案。 Once my father and I went to see a circus (马戏团). A family was standing in front of us   1   for tickets. The family had eight children. Their clothes were not   2   but they were clean. They were talking about the clowns（小丑）and elephants excitedly. “I want   3   tickets, eight for children and two for adults（成人）.” said the father to the ticket lady. The ticket lady told him the   4  . When he heard that, the man couldn’t believe his   5  . He asked again, 通过微视频“生态系统中物质和能量的流动”导学后，为测验“学习任务单”的完成情况，请你和学习小组一起据图完成以下“进阶作业”：（1）如图，A代表生态系统中的者，它们能通过作用利用环境中的无机物合成有机物。（2）图中，兔与鼠之间有关系，鹰锋利的喙和爪有利于捕食，根据达尔文进化论分析，这是的结果。（3）图中D主要是腐生的 ， 是生态系统中的者，可把动植物的遗体、遗物分解成无机物，对自然界的起着不可替代的作用。（4）写出该生态系统的一条食物链 ， 该食物链的能量最终来源于。通过食物链和 ， 生态系统进行着物质和能量的流动，成为一个统一整体。