题型：书面表达 题类：常考题 难易度：困难
新版牛津上海版（深圳用）六年级上册英语Module 4 The natural world模块综合与测试（含小段音频）
We live on the Earth．The Earth was ，but now some parts are dirty．Let's work together to keep the Earth pretty and healthy because the Earth is only home for all the living things．We should ．We should ．We also need water and trees．So we shouldn't ．We should stop ．
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