新概念英语第二册课件lesson 53 Hot snake (共21张PPT)

(共21张PPT)
NEW CONCEPT ENGLISH 2
新概念英语 2
Lesson 53
Hot snake
Key words and expressions
hot [hCt] adj. 带电的，充电的
examine [ig5zAmin] v. 检查
accidentally n. 意外地，偶然的
fireman [5faiEmEn] n.消防队员
cause [kC:z] n. 引起； n. 原因
wire [5waiE] n.电线
volt [vEult] n.伏特（电压单位）
solve [sClv] v.解决
mystery [5mistEri] n.迷
power line [5pauE-lain] 电力线
snatch [snAtF] v.抓住
spark [spa:k] n.电火花
Questions on the text
Language points
Hot snake
hot: charged with electricity a hot wire
Since then, they have been trying to find out how the fire began.
find out: 查明
Forest fires are often caused by broken glass or by cigaretten ends which people carelessly throw away.
The heavy rain caused the flood.
What caused his failure
a glass 一个玻璃杯
A glass of water, please.
glasses 眼镜
Do you know the man wearing glasses over threre
They were also quite sure that a cigarette end did not start the fire.
The smoke started him coughing.
He noticed the remains of a snake which was wound round the electric wires of a 16,000-volt power line.
The snake then wound itself round the wires.
Clouds wind the moumtains.
She wound her injured leg with a bandage.
A bird had snatched up the snake from the ground and then dropped it on to the wires.
on to = onto
When it did so, it sent sparks down to the ground and these immediately started the fire.
so 是代词，指代 winding itself round the wires these 指代 sparks
At last firemen have put out a big forest fire in California.
用现在完成时体现动作的完成对现在的影响。
Since then, they have been trying to find out how the fire began.
动作已经延续到目前。
Forest fires are often caused by broken glass or by cigaretten ends.
表达一般看法。
Yesterday, the firemen examined the ground carefully, but were not able to find any broken glass.
叙述过去发生的动作，带有时间状语。
A bird had snatched up the snake from the ground and then dropped it on to the wires.
过去完成时表示动作发生在叙述中的时间（过去）之前。
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