①人类应保护环境,做到可持续发展
②自然界是客观的,应尊重它,保护它
③人与自然是统一的,二者相互依存
④自然界是物质的,但人类能认识它,利用它
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① ____ A. summer B. winter C. season
② ____ A. which B. there C. why
③ ____ A. because B. pretty C. beautiful