某英语报向中学生征集关于开展研究性学习的文章，请你根据提示，用英语写一篇介绍你校研究性学习活动的短文。
| 研究主题 | 丰富多彩，选择性强，如当地风俗习惯、人民生活变化、环境保护等。 |
| 你们小组的研究课题 | 1. 你家乡河流的污染问题； 2. 三大污染源：工厂废水、生活污水、农民使用的农药； 3. 建议 |
| 感想与体会 | … |
注意：、
1. 开头语已给出，不计入总词数；
2. 可根据内容要点适当发挥，但不要逐条翻译；
3. 词数：120左右。
参考词汇：agricultural chemicals
Nowadays we are required to do research work apart from the lessons we learn in school. We are very interested in this kind of activity.
Nowadays we are required to do research work apart from the lessons we learn in school．We are very interested in this kind of activity．We have a variety of subjects to choose from，such as local customs，changes of people's living conditions，and protection of the environment．
Last term our group made a study of the pollution in a river in my hometown．The river used to be clean．but now it is dirty and t}lo water gives off a terrible smell．Our research shows that the river is mainly polluted by the waste water from the factories．Waste water from people’s daily life and agricultural chemicals also lead to the pollution of the river．To deal with the problem．we call
for people to be aware of how serious the situation is and do something about it．
Through our research，not only did we gain practical experience。but also we developed
various abilities．We find such research very valuable and helpful．