Language Points
Ⅰ.重点单词、短语 1. differ vi.不同,相异 In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Think about how they differ. 两人一组, 观察图片并讨论哪些是自然无性繁殖, 哪些是人工的。想想它们的区别。