Cleaning up Our Environment
提纲
1．随处可见的环境污染。
2．怎样才能使环境清洁。
3．你的看法。
The sky looks grey; the rivers become black; the grass is covered with plastic bags. You will easily get your hair and shoes dirty while walking along the streets, and the air smells terrible. That is our environment now. That is the world we live in. Wherever you are, whatever you do, you can hardly esc
