A Before Reading 1
1 Discovery 3
2 Different Stages of Development 4
3 What Is Electricity 9
4 Batteries 12
B While Reading 15
5 Power Stations 17
6 Alternative Methods 22
7 Inventions Using Electricity 28
Points for Understanding 31
C After Reading 33
Answer Key 35
新标准中小学分级英语读物 41