15 Making inquiries Shopping At home with the twins 1
16 Talking about objects and languages What's it made of? 13
17 Direction and some common signs What was it made of? 25
18 Giving instructions Measurement Planting trees 36
19 Mainly revision 47
20 Number and comparison The world's population 56
21 Shopping Shopping 67
22 Seeing the doctor At the doctor's 77
23 Giving opinions The football match 88
24 Mainly revision 99
附录 110