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一、要点及要求1.知识要点(1)水的性质和水的三态变化;(2)水在自然界里的循环和水的溶解与净化;(3)土壤的成分和土壤的保护与改良;(4)空气的性质和主要成分,空气的流动和污染、保护.
I. KEY POINTS AND REQUIREMENTS 1. KNOWLEDGE POINTS (1) Water properties and tri-state changes in water; (2) Water circulation and dissolution and purification of water in nature; (3) Soil composition and soil protection and improvement (4) Air properties and main components, air flow, pollution and protection.