01 Unit 1 Water
02 Unit 1 Viewing and listening
03 Unit 1 Speaking
04 Unit 1 Reading
05 Unit 1 Discovery
06 Unit 1 Words and expressions
07 Unit 2 Digital life
08 Unit 2 Viewing and listening
09 Unit 2 Speaking
10 Unit 2 Reading
11 Unit 2 Discovery
12 Unit 2 Words and expressions
13 Unit 3 Curious minds
14 Unit 3 Viewing and listening
15 Unit 3 Speaking
16 Unit 3 Reading
17 Unit 3 Discovery
18 Unit 3 Words and expressions
19 Unit 4 Then and now
20 Unit 4 Viewing and listening
21 Unit 4 Speaking
22 Unit 4 Reading
23 Unit 4 Discovery
24 Unit 4 Words and expressions
25 Unit 5 Teamwork
26 Unit 5 Viewing and listening
27 Unit 5 Speaking
28 Unit 5 Reading
29 Unit 5 Discovery
30 Unit 5 Words and expressions
31 Unit 6 Life in the future
32 Unit 6 Viewing and listening
33 Unit 6 Speaking
34 Unit 6 Reading
35 Unit 6 Discovery
36 Unit 6 Words and expressions
37 Culture corner：Exploring China
38 Culture corner：Exploring the world
39 Literature corner：A chapter to start with
40 Literature corner：A scene to act out
41 Literature corner：A poem to savour
42 Pronunciation file
43 Proper nouns and glossary
44 Numbers
45 Irregular verbs
