九年級英語全冊 unit 13 we’re trying to save the earth section a（1a-2d）課件 新人教版 (2)(文件)
【正文】 The air is badly polluted because there are ______ on land. 2. Factories that burn coal also _______ the air with a lot of black smoke. 3. There is also too much rubbish and waste. People ______ things everyday. 4. People are also littering in ______ like parks. This is turning beautiful places into ugly ones. Practice ? Roleplay
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