新概念英语第二册 Lesson 53 hot snake 课件(共18张PPT)

(共18张PPT)
Lesson 53 Hot snake
Lesson 53 Hot snake
Learning Targets
I. 单词：13个
短语：9个
语法：did, have done, have been doing
IV. 难点：throw to/at/away, quite & quiet,
cause & reason, drop & fall
Oral English
1. 你想知道这场火灾的起因是什么，你该问：
What was the cause of the fire
2. 你想知道如何在火灾中保护好我们自己，你该问：
How can we protect ourselves in a fire
Revision & Dictation
1 move into a new house 乔迁新居
2 work hard 努力工作
3 get/put sth. in order 弄得井然有序
4 to make matters worse 事情更糟糕的是
5 at the moment 此刻
6 a short while ago 几分钟前
7 help sb. （to）do 帮助某人做某事
8 carry sth. up the stairs 把…搬到楼上
9 get a big surprise 大吃一惊
10 gaze at 盯着
11 in your spare time 在你空闲时
Read and Answer
Q1: What are forest fires often caused by
Forest fires are often cause by broken glass or by cigarette ends which people carelessly throw away.
Q2: Did the fireman discover the cause accidently
Yes, he did.
hot [h t] adj. 带电的，充电的
fireman ['fa m n] n. 消防队员
cause [k z] v. 引起； n. 原因
examine [ g'z m n] v. 检查
accidentally [ ks 'dentl ] adv. 意外地，偶然地
remains [r 'me nz] n. 尸体，残骸
wire [wa ] n. 电线
volt [v lt] n. 伏特（电压单位）
power line [‘pa - la n] n. 电力线
solve [s lv] v. 解决
mystery [‘m stri] n. 谜
snatch [sn t ] v. 抓住
spark [spɑ:k] n. 电火花
New words
Word Recycling
ause
xamined
ccidentally
emains
ires
olve
ystery
natched
parks
ot
Phrases & Key Points
英文 中文 考点匹配
1 put out a big forest fire 扑灭森林大火 put out 扑灭
2 since then 自从那时 后接现在完成时
3 find out 查出 区分find, look for, find out
4 are caused by… 由…引起的 be caused by
5 throw away 扔掉 throw-threw-thrown
6 were able to do… 能够 区分be able to和can
7 start the fire 点火
8 the remains of a snake 蛇的残骸 remain v.保持不变，仍然是
remains n.剩余物
9 wind round the electic wires 缠在电线上
10 in this way 用这种方式 In a way在某种程度上by the way顺便一提
11 solve the mystery 揭秘 近义词deal with
12 snatch up… 抓起
13 send spark down to… 向下发送火花 send-sent send to 发送
At last firemen 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 firemen 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 fireman accidentally discovered the cause.
Hot snake - I
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.
Hot snake - II
Focus on grammar
At last firemen have put out a big forest fire.
Since then, they have been trying to find out how the fire began.
Yesterday the firemen examined the ground carefully, but were not able to find any broken glass.
现在完成时态
现在完成进行时态
一般过去时态
一般过去时的时间状语: yesterday, ago, last…, this morning, at that time, just now, in 1990,
Grammar rule--现在完成时
join the army has stayed in the army ________________________________________
past now future
现在完成时：强调动作或状态发生于 一直延续到 且有可 能继续延续下去。
现在
过去
现在完成时-时间状语：
1. for+时间段, since+时间点 , since +时间段ago, since + 句子(动词为过去式) ;
2. 到现在为止:so far, up to now, by now, up till now；
3. over / in the past few years, during the past weeks
4. just(刚刚), already (已经,肯定句) , yet(还没有，否定句）
5. 句型：
1) This (That/It) is the first (second…) time + that从句
This is the first time that I _________ (see) pandas.
2) This (That/It) is the best/ finest /most interesting … + that从句
It is the most delicious food that I ___________(taste).
have seen
have tasted
1.—Your new bike is so nice! When did you buy it
—In July. I _________ it for two weeks.
A. had B. have had C. have bought D. bought
2. Melting ice(融冰) can cause sea levels to rise. Since 1993, sea levels _________ at a speed of 3.2 cm every 10 years.
A. rose B. have risen C. rise
3. —It’s ten years since we came here.
—How time flies! We _________ in China for so long.
A. work B. worked C. will work D. have worked
4. —Look! My mother ______ a new dress for me.
—Wow, it looks very nice on you.
A. is making B. has made C. will make
5. The shop in Wanda Square _____for six years, but I _______ there so far.
A. has opened; haven’t gone B. has been opened; haven’t been
C. has been open; haven’t gone D. has been opened; haven’t been
一、用动词适当形式填空
1. I _____ already ______(see) the film. I _____ (see) it last week.
2. ______ he _______(fihish) his work today Not yet.
3. My father ______just _____(come) back from work. He is tired now.
4. Where is Li Ming He ________(go) to the teacher's office.
5. I _______ (work) here since I _______(move) here in 2005.
6. How long _____ the Wangs _______(stay) here For two weeks.
7. I ______ just ________(finish) my homework.
8. _______ you ______ (find) your science book yet
have seen
saw
Have finished
has come
has gone
have worked
moved
have stayed
have finished
Have found
Have firemen put out a big forest fire in California or not Have they been trying to discover its cause (Now that …)
2. Was there any evidence that it was started by broken glass or by a cigarette end or not
3. Who has just solved the mystery (However)
4. What did he notice Had it been dropped by a bird on to the electric wires or not (which)
5. Where did the snake wind itself What had it sent to the ground Did this cause the fire or not (In winding…and)
Summary Writing
1. Now that firemen have put out a big forest fire in California, they have been trying to discover its cause.
2. There was no evidence that it was started by broken glass or a cigarette end.
3. However, a fireman has just solved the mystery.
4. He noticed the remains of a snake which had been dropped by a bird on to some electric wires.
5. In winding itself round the wires, the snake had sent sparks to the ground and this caused the fire.
Keys to SW
Homework
Recite L53.
SW of L53