Lesson 3 What's the Big Idea? Let's Talk 1 A: This baby looks cute. B: I beg your pardon? A: I said, "It's a cute baby." Let's Talk 2 A: What is a stapler used for? B: It's used for holding pieces of paper together. A: I got it. Read and Understand 1 다음 두 발명가에 관한 글을 읽어 봅시다. What is invention? It means using ideas to make new things. Machines like radios and compu..