作文。请以“Our earth”为题写一篇不少于50词的作文。
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Our earth

Our earth is beautiful. There are rivers, mountains and forests on it. People live on land happily. Many years
ago, the earth was clean. Today there is air pollution, water pollution and land pollution. We must stop cutting
down the forests, killing the animals and polluting the land. We must save the earth.
答案不唯一