Our class had a discussion about protecting the environment. Here is my opinion. I think the environment is one of our biggest worries. It was found out that a lot of air pollution is actually caused by ordinary people, not just by big factories. There are so many things each one of us can do every day. It’s best for people to take buses or walk instead of driving cars. We should stop to use plastic bags for shopping. We can cut down on waste, recycle trash and eat more natural food. In these ways we can save energy and reduce pollutions.

题目分析：本题要求写一篇保护环境的议论文。要求中已经给出了主要要点，因此要求我们自由发挥的地方较多，只是需要注意不能遗留要求中的要点。动笔前先要注意认真审题，分析体裁，确定时态；分析内容要点，列出一些基本词汇及词组；注意表达的条理性，用好连接词；为丰富文章的文采，可以多用一些复合句。最后，注意不要犯语法、句法以及搭配性错误，写好后反复读几遍，适当修改。

点评：本题难度较大，由于给出信息较少，故解题前需要自己组织整理材料。可先根据要求列出简要提纲，然后在动笔写作，不跑题偏题是做好书面表达的前提条件。