题目:
I have a good friend. Her name is Kate. She is American girl. She is eleven. She with her family in China. There are people in her family. They’re her father, her mother, her brother and herself(她自己). She has a cat. name is Mimi. It’s Sunday today. They at home. Look! Kate with Mimi. Her father is reading newspapers. Her mother is cleaning the house. Where is her brother Jim? He is doing homework in his study. Kate Chinese very much, but she can’t it very well. Jim likes soccer. He can play it very well.
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答案:
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人工建立的生态系统包括农田生态系统和城市生态系统.农田生态系统是指一定农田范围内,作物和其他生物及其环境通过复杂的相互作用和相互依存而形成的统一整体,即一定范围内农田构成的生态系统.城市生态系统中...