Lesson 53 Hot snake上课时间：上课地点:教学用书：新概念二教学目标: ①掌握生词和短语cause cause sb to do sth remainssolve……②掌握现在完成进行时与现在完成时用法教学重难点：现在完成进行时与现在完成时用法及区别教学过程：阅读文章回答问题1、What are forest fires often caused by ？2、What led the fireman to discover the cause of the fire？3、What was the explanation？一、单词教学1.hot adj 热的，炎热的It is very hot today. 今天很热。
Strike while the iron is hot.趁热打铁.hot 炎热的warm 温暖的cool 凉爽的chilly 寒冷的cold 寒冷的,严寒的2.调味品辣的Pepper and mustard are hot.辣椒和芥末是辣的.强烈的,激烈的,热烈的.have a hot temper 脾气暴躁a hot potato 棘手或讨厌的事物或情况2.cause（1）V. 引起cause sth : 引起（麻烦）Carelessness causes accidents.粗心导致事故Pride causes failure骄傲使人失败cause sb to do sth引起某人做某事, 导致某人做某事2）n. 原因cause : 强调事情发生的直接原因(一个)Do you know the reason of the war?你知道这场战争发生的原因么？reason : 其他各种的理由(很多个)Give me your reasons for going there.请告诉我你去那里的原因。
3.★ examine1）v. 仔细观察,检查,调查The firefighters examined every inch of the forest.消防队员检查了森林的每一寸土地。
2）v. 诊查The doctor examined his patient carefully .医生仔细的诊察了病人。
3）v. 考试,测试examine students in Englishn. exam 考试=examination4.★ accidentally adv. 意外地,偶然地adj. accidental 意外的,偶然的反义词intentionalan accidental death意外死亡accidentn. 事故,意外车祸a car accidentaccidentally=by chance=by accidentI found a gold mine by accident.我偶然间发现了金矿5.★ remains(1)①n. 剩余物,残余物the remains of a meal残汤剩饭②n. (古建筑等物)遗址,废墟the remains of Yuanmingyuan圆明园遗址③n. 遗体,遗骸The remains of Chairman Mao were kept well in a crystal coffin.毛主席的遗体被保存在水晶棺材里。
(2)remain v.保持,停留He must remain in bed for another two days.他必须在床上再待两天。
★ wiren. 金属线，电线，（指具体的电线铁丝等）cycle with a piece of wire.他用一根金属线把筐绑到了自行车上。
telephone wires 电话线electric wires 电线wireless adj. 无线的★volt n. 伏特voltage n. 电压,伏特数★ power1）电力，动力electric power 电力water power 水力2）力,能力（自然的体力、智力）His power is failing.他的体力在衰退。
3）权力,支配力,势力political power 政治权力not within one’s power= beyond one’s power力所不能及It is beyond my power to understand how the computer works.我无法理解计算机是如何工作的。
★solve v. 解决,解答,回答=work outsolve a problem解决问题solve a mystery解开谜团We must solve the economic crisis.我们必须解决经济危机。
n. solution 解决,解答It took a long time to find the solution花费了很长时间才找出解决方法。
★ snatch1）v. 抢,夺,掠取snatch up 抓起来,把握We should snatch up the deal我们应该把握住那个交易.The thief snatched her bag and ran away.贼把她的包抓起来逃跑了。
He snatched the paper as his mother was about to see it.在他妈妈刚要看那张纸的时候，他把它夺走了。
2）v. (趁机)迅速取得,急急忙忙。
He snathed a kiss from her.他出其不意,吻了她一下snatch 迅速而有力(粗鲁地)抓住,抢snatch a chancegrab 抓,抢,抢夺,抓住(热切而拼命地)grab sth from sb/ grab sth from sthgrasp 1) 抓住或咬住,抓紧grasp a chance 抓住机会2)掌握grasp a language课文讲解：1. At last firemen have put out a big forest fire in California.at last 最后，终于，过程很艰难。
他们终于翻过了这座大山。
At last they climbed over the mountain．put out 扑灭，熄灭，关掉Please put the light out.请把灯关掉。
make a fire 生火start a fire 引起火灾2．Forest fires are often caused by broken glass or by cigarette ends which people carelessly throw away.cigarette ends 烟头throw away 扔掉，丢弃throw about 随处扔throw at 扔向（有目标性）throw to 扔向（无目标性）3.Yesterday the firemen examined the ground carefully, but were notable to find any broken glass.be able to 能够；be not able to 没有能够3. Since then, they have been trying to find out how the fire began. since then 从那时起，到现在为止find out（经过研究、努力等）找出，发现，查出……I’ll try and find out the name of the person who saved my life yesterday.我会试着查出昨天救了我的人的名字。
find强调在经过“寻找”（look for）后找的“结果”（找到或者找不到）又可以表示（偶然地）发现……I found a watch on the road 我在路上发现了一块表。
4.They were also quite sure that a cigarette end did not start the fire. be sure that 对……很有把握；I am sure that they are wrong. 我确信他们是错的。
quite sure 相当的把握性I am not quite sure what to say about that .关于那要说些什么我没有把握。
rather adv. 相当His groundback does sound rather princely. 他的背景听起来很华丽。
fairly adv. 相当, 公正地, 诚实地His method is fairly simply 他的方法相当简单。
quite(＝completely)－>rather－>fairly程度一个比一个轻quite a few 颇有几个(相当多的)Quite a few kinds of animals are in danger now 现在有相当一部分种类的动物濒临灭绝。
start a fire＝cause a firestart vt . 使……发生，引起Do you know the cause of the fire?你知道起火原因吗？5.This morning, however, a firemen accidentally discovered the cause. However与but区别：However要接逗号，再加句子。
But直接与句子相连。
accidentally =by chance 偶然地discover 偶然发现（某个已经存在的东西）Invent 发明（以前没有的东西）I discover that she was a good cook.我发现她是一个烹饪好手。
Edison did not discover electricity ,but invented light bulb.爱迪生不是发现了电而是发明了灯泡。
The teacher wanted to find out who had broken the door.老师想查明是谁弄坏了门。
I don’t know who discovered America.我不知道谁发现的美洲。
6．He noticed the remains of a snake which was wound round the electric wires of a 16,000-volt power line.notice 注意别人没注意的东西the remains表示“尸体，残骸”，必须用复数形式村民们很惊奇的看到在湖的旁边有一架飞机的残骸。