环境保护类话题作文专题导学案Step1 Read the sentences and underline some key phrases and sentence patterns.1. As we know, many rivers and lakes are seriously polluted.2. It is very important to deal with the rubbish in cities. Rubbish should be treated properly.3. Laws have been passed to protect our environment.4. To cherish the environment is to love ourselves.5. With the development of science and technology, more and more pollution is produced.6. We should take immediate action / steps to fig