一、听力mp3

(请同学们先听一边课文听力,再逐次查看课文与翻译内容。)
 

 
1.课文
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. 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.
 
2.翻译
消防队员们终于扑灭了加利福尼亚的一场森林大火。从那时起,他们一直试图找出起火的原因。森林火灾时常由破碎的玻璃或人们随手扔掉的香烟头引起。昨天,消防队员仔细查看了地面,但未能发现碎玻璃。他们还十分肯定火灾也不是由烟头引起的。然而今天上午,一个消防队员偶然发现了起火的原因。他发现了缠绕在16,000伏高压线上的一条死蛇。就这样,他解开了起火之谜。解释很简单,却异乎寻常。一只鸟把蛇从地上抓起来,然后把它扔到了电线上。于是蛇就缠住了几根电线。当它这样做时,把火花送到了地面,这些火花立刻引起了一场大火。

 

二、学习视频

[flvplayer http://bcs.duapp.com/newce1/media/2-53.mp4 400 300]
(手机端无法播放视频,请从PC上浏览)
 

三、课文精讲

(课文精讲根据顺序分析课文重点)
 
  1.At last firemen have put out a big forest fire in California.消防队员们终于扑灭了加利福尼亚的一场森林大火。
  (1)at last(终于,到底)表示经过一番努力之后。
  (2)put out可以表示“扑灭”、“熄灭”、“关掉”等含义:
  Please put the light/ fire out.
  请把灯关掉/把火灭掉。
  (3)forest虽然是名词,但在句中起形容词的作用,修饰fire。
  2.…they have been trying to find out how the fire began.……他们一直试图找出起火的原因。
  (1)短语动词find out表示经过研究、努力等“发现”、“找出”、“查出”:
  I'll try and find out the name of the person who saved my life yesterday.
  我将设法查出昨天救我命的那个人的姓名。
  (2)how the fire began是find out的宾语,它是一个由疑问词how引导的名词从句。
  3.They were also quite sure that a cigarette end did not start the fire.他们还十分肯定火灾也不是由烟头引起的。
  (1)start作及物动词时可以表示“使……发生”、“引起”。
  (2)be sure后面跟的是名词从句。that引导的这个名词从句也可以写成that the fire was not started by a cigarette end。但这里强调的是引起火灾的原因(不是碎玻璃或烟头),所以用烟头作主语。
  4.…a fireman accidentally discovered the cause.……一个消防队员偶然发现了起火的原因。
  discover本身含有偶然发现(某个已经存在的东西)的含义:
  I don't know who discovered America.
  我不知道谁发现美洲的。
  在discover前面加上accidentally更加强了“偶然”、“意外”的含义。
  5.He noticed the remains of a snake which was wound round the electric wires of a 16,000-volt power line.他发现了缠绕在16,000伏高压线上的一条死蛇。
  (1)the remains表示“尸体”、“残骸”,必须用复数形式:
  The villagers were surprised to see the remains of an aeroplane near the lake.
  村民们惊讶地发现湖边有一架飞机的残骸。
  (2)wound为wind的过去分词。wind在这里不表示“蜿蜒”,而表示“卷在……上”、“缠绕”,常与around/round连用:
  Did you wind this piece of wire round the tree?
  是你把这根铁丝缠在树上的吗?
  (3)wire指具体的电线、铁丝等,line在这里指“线路”,含义比wire广。
  6.When it did so…当它这样做时……
  so常用于一些动词之后,代指前面提过的某个动作/某件事,以免重复

四、单词学习

1、提示:n.名词、adj.形容词、vi.不及物动词、vt.及物动词、adv.副词、prep.介词、pron.代词、int.感叹词、num.数词、abbr.短语缩写
2、双击或选中某个单词可划词查字典。(手机端无法使用此功能)

3、单词列表:
hot adj. 带电的,充电的
fireman n. 消防队员
cause v. 引起; n. 原因
examine v. 检查
accidentally adv. 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
snatch v. 抓住
spark n. 电火花
 

五、重点难点

(重点难点包括语法、短语固定搭配、习惯用语等内容)
 
  一般过去时、现在完成时与现在完成进行时(cf.第29课第52课语法)
  一般过去时通常与一个表示确切的时间的状语连用,现在完成时则有时与表示一段时间的状语连用,有时不需要时间状语,而现在完成进行时则有时与表示一段时间的状语连用,有时与all+表示时间的名词连用。现在完成时与一般过去时中既可以用状态动词(表示存在、拥有、感情、思想、需求等的动词)也可以用行为动词,现在完成进行时则通常与行为动词连用
 

六、课后练习答案

  1.关键句型练习答案
  A What happened: began(1.2);examined(1.4);were not able to find(1.5);did not start(1.6);discovered(1.7); noticed (1.8);was wound(1.8);was able to solve(1.9);dropped (1.10); wound(1.11); it did so(1.11); sent(1.11); started(1.11)
  What has happened: have put out(1.1)
  What has been happening: have been trying to find(1.2)
  C Jack looked at his watch for the twentieth time. Suddenly Jill arrived.
  ‘I've been waiting for over an hour,’he said angrily.‘You never come on time.’
  ‘Oh, is that so?’Jill answered.‘Were you here at 2.30?’Jack went red.‘Well,’he said,‘I go here five minutes late myself, but you weren't here.’
  ‘I came here at exactly 2.30,’Jill said,‘and I waited for five minutes, but you didn't come.’
  ‘What have you been doing since then?’Jack asked.‘I've just been to the hairdresser's,’Jill answered brightly.
  2.难点练习答案
  a Look: you threw the potato-peeler away by mistake.
  The shepherd threw some food to his dogs.
  The teacher threw some chalk at a boy who wasn't listening.
  b I'm quite certain these are my glasses.
  The children are very quiet. What's going on?
  c The cause of unemployment is complicated.
  Can you explain the reason for changing our arrangements?
  He reasoned that we would have to comply, even if we didn't wish to.
  d Please don't drop that vase!
  It fell from my hands and broke.
  3.多项选择题答案
  1c 2d 3a 4c 5c 6c
  7d 8c 9d 10 a 11c 12 c