Unit 5 Hot Snake-Lesson 9 课件(共13张PPT)

(共13张PPT)
Unit 5 Hot Snake
Lesson 9
A Mystery in California
What usually causes forest fires
Searching for Clues
No broken glass
Not a cigarette end
Why were firefighters confused
At last firefighters have put out a big forest fire in California. Since then, they have been trying to find out how the fire began.
Forest fires are often caused by broken glass or by cigarette ends which people carelessly throw away. Yesterday the firefighters examined the ground carefully, but were not able to find any broken glass. They were also quite sure that a cigarette end did not start the fire.
This morning, however, a firefighter accidentally discovered the cause. He noticed the remains of a snake which was wound round the electric wires of a 16,000-volt power line. In this way, he was able to solve the mystery.
The explanation was simple but very unusual. A bird had snatched up the snake from the ground and then dropped it on to the wires. The snake then wound itself round the wires. When it did so, it sent sparks down to the ground and these immediately started a fire.
Retell the story
1.firefighters put out fire in California
2.since then find out fire began
3.forest fires glass cigarette ends
4.examined couldn't find broken glass
5.quite sure cigarette end not start
Retell the story
6.This morning accidentally the cause
7.remains snake wires power line
8.explanation simple unusual
9.bird snatched up dropped on to
10.When wound sent sparks started
Summary Challenge
Now that firefighters have put out...
There was no evidence...
However, a firefighter...
Fire Safety at Home
What Caused the Fire
Role play
News Reporter Live!
Student A—— Journalist
Student B—— Fireman
Ep:We've discovered that...
Thank you!