20xx秋上海教育版英语六年级上册module4unit12theearthperiod2ppt课件内容摘要：
and water on the Earth. There are people, animals and plants on the Earth. People have lived on the Earth for millions of years. Many years ago, the Earth was clean. Today, there is air pollution, water pollution and land pollution. People cut down the forests. Many plants, wild animals, birds and insects live there. People kill animals for food and their skins. People are polluting the land, the water and the air. What lives in the forests? What do people do to the forests? Why are people killing animals? We should stop throwing rubbish into rivers. We should stop cutting down so many trees. We should stop using plastic bags. We should stop throwing rubbi。阅读剩余 0%
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