Unit 3 What's This? What's This? I Can Read B Look and Number A Listen, Read, and Say CD2 2~3 1 a book 2 a marker 3 a pen 4 4 a pencil 5 11 12 13 1 2 3 4 5 6 7 6 5 4 3 2 1 7 8 5 a ruler 9 10 11 12 13 6 3 6 an eraser 43 forty-three