To improve the （）is regarded as a good method to increase the farmer's income in the south part of the country. A: sewage B: drainage C: aqueduct D: archway

Please find the word that is equivalent to the definition.fit for drinking A: sewage B: vegetation C: potable D: drainage E: waterlogged F: sediment G: habitat H: erosion

Please find the word that is equivalent to the definition.flooded with water A: sewage B: vegetation C: potable D: drainage E: waterlogged F: sediment G: habitat H: erosion

The most important crucial question is what causes water pollution A: Natural disasters such as volcano eruptions B: Animal waste C: Residues from storms and floods D: Every day sewage E: Garbage F: Oil spills G: Fossil fuels combistion H: Chemical fertilizers I: Pesticides

Which of the items are exempted from environmental protection tax? A: Taxable pollutants discharged by large-scale farms B: Taxable pollutants discharged by mobile pollution sources such as boats and aircrafts C: Sewage discharged directly to the environment by a school D: Solid waste comprehensively utilized by taxpayers that conforms to the national and local environmental protection standards