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XI. Think and write. 想一想，完善海报内容。
How to protect the earth
1. Plant more trees and flowers.
2.
3.
4.
5.
How to protect the earth
1. Plant more trees and flowers.
2.
3.
4.
5.
答案
参考示例：
2. Save water and don't waste it.
3. Don't throw rubbish everywhere.
4. Use both sides of the paper when we write.
5. Go to school by bike or on foot to reduce air pollution.
2. Save water and don't waste it.
3. Don't throw rubbish everywhere.
4. Use both sides of the paper when we write.
5. Go to school by bike or on foot to reduce air pollution.
解析
本题是开放性写作题，要求围绕“保护地球”的主题，用符合六年级英语水平的简单句式列举合理的环保行为，答案不唯一，内容只要语义通顺、符合环保主题、语法正确即可。
