Be a Friend to Trees (Let's Read and Find Out) 自然科学启蒙2：跟大树做朋
Why should you be a friend to trees? Trees are a valuable natural resource. People depend on treesfor food, and animals depend on trees for food and shelter. Butmost important, we depend on trees because they add oxygen, a gaswe all need, to the air. While trees give us many wonderfulproducts, we must also protect them because we can't live withoutthem.
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现货 中图原版 Be a Friend to Trees 跟大树做朋友
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