某调查组到社会上进行环境污染问题的调查，设计了下列调查表。请你根据调查表内容说说如何做好学校环境保护方面的工作。

要求：短文要求正确、流畅；词数80个左右。

提示词：keep……clean and tidy, clean, sweep, throw rubbish into the dustbins,

plant, so that, protect, speak highly of, make a contribution to doing

    There are many kinds of pollution around us, such as air pollution, water pollution, noise pollution and litter.……        

—I don't know the _______. Maybe you can ask his good friend Simon.

下列物质中，不属于构成蛋白质的氨基酸的是（　　）