最佳答案:Plastic bag is the worst invention ever in the 20th century.
最佳答案:Plastic bag is the worst invention ever in the 20th century.
最佳答案:We shouldn't use too many plastic bags and bottles.
最佳答案:Research on the Infrared Spectrum Application to Chemical Composition Analysis o
最佳答案:As we all know,environmental protection to the people,to this point has been rea
最佳答案:White pollution and garbage pollution nearly,they are different white pollution