Unit 2 Saving the Earth Topic 2 All these problems are very serious. Section B Teaching aims and demands 1. Learn some new words and phrases: sand, cut down, change into, prevent, law, prevent from, human being, although, turn off 2. Learn some useful sentences: (1) I couldnt see anything, and my face hurt while I was walking down the street just now. (2) Pass laws against water pollution. (3) Remember to turn the tap off when you leave. 3. Continue to learn the indefinite pronoun and adverb. 4.
