第二册
Lesson 1-4
Lesson 5-8
Lesson 9-12
Lesson 13-16
Lesson 17-20
Lesson 21-24
Lesson 25-28
Lesson 29-32
Lesson 33-36
Lesson 37-40
Lesson 41-44
Lesson 45-48
Lesson 49-52
Lesson 53-56
Lesson 57-60
Lesson 61-64
Lesson 65-68
Lesson 69-72
Lesson 73-76
Lesson 77-80
Lesson 81-84
Lesson 85-88
Lesson 89-92
Lesson 93-96
fireman
n.消防队员
cause
v.引起；n.原因
examine
v.检查
accidentally
ad.意外地；偶然地
remains
n.尸体；残骸
wire
n.电线
volt
n.伏特（电压单位）
power line
电力线
solve
v.解决
mystery
n.谜