P28 4-3 1. Listen and tick (√). 听一听，勾出正确的图片。

1. G: What’s this?

    B: It’s a book.

2. G: What’s that?

    B: It’s a pencil.

3. G: What’s that?

    G: It’s a bag.

4. B: What’s this?

    G: It’s a ruler.