1、Unit 1 Welcome to the unit Nature in the balance Let us not, however, flatter ourselves overmuch on account of our human victories over nature. For each such victory nature takes its revenge on us. Friedrich Engels Step 1: Lead in 人类要和自然和谐相处。 “但是我们不要过分陶醉于我们人类对自然界的胜利。对于每一次这样的 胜利，自然界都对我们进行报复。” 恩格斯是德国哲
2、学家、革命导师。这句话选自他的劳动在从猿到人转变 过程中的作用一文，意在告诫我们： Listen to the song and discuss the following questions in pairs. Step 2: Listening Listen to the song and discuss the following questions in pairs. 1. What are the rhyming words in this song? Possible answer: harm/alarm; seas/trees; clean/green; above/love;
3、pollution/solution Step 2: Listening 2. How do you understand “harm” and “alarm” in this song? Possible answer: “Harm” means something bad we have done to the Earth, including polluting soils and seas, cutting down too many trees, etc. “Alarm” means the signal that warns us of the importance of envi
4、ronmental protection which urges us to find a solution to this problem. Step 2: Listening 3. What is the message of the song? Humans have done much harm to the Earth, and we have to take action to change this situation. 4. What can you do to help protect the environment? We can use less paper and fe
5、wer plastic bottles and bags. Cutting down on electricity usage can also help reduce the air pollution that power stations create. Step 2: Listening Discuss more ways to protect the environment. 1. Plant trees; 2. Protect the forest; 3. . Step 3: Discussion 1. Review what we have learnt. 2. Preview the Reading part. Step 4: Homework