; 春天是一年中最好的季节，天气变得越来越暖和。我和我的同学们进行了一次环城一日游，所到之处景色宜人。但当我看到沿着城区流过的河流时，我感到很惋惜，想了很多。
随着现代工农业的发展，越来越多的污水排进河里，河水被严重污染。河水变得如此的肮脏以致于生物不能在里面生活。河水发出难闻的气味。
我们急切呼吁采取措施改变这种状况。政府应当建立各种设备，例如污水处理厂，并且鼓励科学家们想出更多更好的办法以减少水污染。
水是生命之源，保护水资源十分重要。
my classmates and i had an outing this spring. we had a good time. but meanwhile i noticed that water pollution in our city was becoming more and more serious.
on our way, we could see women washing clothes in the river. litter was floating on the river. waste water produced by a chemical factory was being discharged into the river. we did not see any fish in the river. the fiver was not so clear as before. water quality was very bad. i am worried
about it because water is important to all living things. man can not live without water. i hope people pay more attention to this problem, especi