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选题在生物课上我们已经学习了有关微生物的知识，了解到微生物在自然界物质循环、垃圾处理和环境保护方面所发挥的重要作用，结合当前城市中的”白色污染“问题，我们选择了一项实验课题，从2000年12月开始在老师和有关专家的指导下，利用寒假和课余时间进行有关资料的搜集和
Topic Selection In Biology, we have learned about microorganisms, and understand the important role that microbes play in the physical recycling, waste disposal and environmental protection in the natural world. Combining with the “white pollution” in the current cities, we have chosen a Project, from December 2000 onwards under the guidance of the teacher and the relevant experts, the use of winter holidays and spare time for the collection of relevant information and