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2018_2019学年冀教版九年级英语上册Unit5教案
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Unit 5 Look into Science
Lesson 25: Let’s Do an Experiment!
I. Learning aims:
Master the new words:
experiment, jar, upside, pour, correct, scientific, method, raincoat, force, pressure, conclude
II. Learning important and difficult points:
1) I cover the top with a piece of cardboard and hold it there.
2) I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet.
3) The force of the air keeps the water in the jar.
4) It is strong enough to hold the water.
Language Points:
1. I cover the top with a piece of cardboard and hold it there. 我用纸板把上面盖住然后托住它。
【用法】?句式 cover…with…意为“用……覆盖……”,类似句式be covered with 表示“被……覆盖”,这是一个系表结构。
【举例】①My mother covered the table with cloth. 我妈妈用布把桌子盖住了。②The bed is covered with paper. 床上盖满了纸。
2. I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet. 我对布莱恩在你头上做实验的理论很有把握,并且你不会湿的。
【用法】这句话中的句式be sure of意为“对……有把握”;that Brian can do the experiment over your head是定语从句,修饰前面的名词theory。
【举例】①Are you sure of this matter? 你对这件事情有把握吗?②This is the book that I borrowed from the library. 这是我从图书馆借的书。
3. It is strong enough to hold the water. 它力量很大足以把水托住。
【用法】句中的enough to do…意为“足以……做某事”,这里的enough起副词作用,用在形容词或副词后作状语。
【举例】Allan is old enough to go to work. 艾伦到上班年龄了。
Lesson 26: Keep the Candle Burning
I. Learning aims:
Master the new words:
holder, shallow, lighter, match, examine, oxygen
II. Learning important and difficult points:
1) Let the candle burn for two or three minutes.
2)When the candle stops burning, it has used up all the oxygen in the air.
3)How far does it rise?
4) Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar.
Language Points:
词汇详解
1. When the candle stops burning, it has used up all the oxygen in the air. 当蜡烛停止燃烧时,它就用完了空气中所有的氧气了。
【用法】use up意思是“用完、用光”,这是“动词 + 副词”短语。这类短语用名词作宾语时,名词可用在副词前,也可用在副词后;用代词作宾语时,代词则必须用在副词前。
【举例】I gave Li Ming a lot of pencils, but he has used them up already. 我给了李明很多铅笔,但他已经把它们都用完了。
2. Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar. 因为组成空气的成分大约五分之一是氧气,所以水会上升并且填充瓶子的大约五分之一。
【用法】短语be made up of意为“由……组成”,后加名词或代词作介词宾语。
【举例】This grade is made up of ten classes. 这个年级是由十个班组成的。
【用法】句中的one-fifth意思是“五分之一”,这是一个分数。分数的表达一般遵循以下规则:分子用基数词,分母用序数词;当分子大于一时,分母要用复数形式;并且其中的连字符号有时可以不要。
【举例】one-fourth 四分之一 three fifths 五分之三
Lesson 27: Planet Danny
I. Learning aims:
Master the new words:
telescope, solar, unless, double, mystery
II. Learning important and difficult points:
1) Try looking through the other end.
2) Maybe Brian and I can join you after supper.
3) Scientists use huge telescopes when they look for planets.
4) Well, it’s worth a try, even if I don’t find a planet.
Language Points:
1. double
【用法】作可数名词,意为“两倍、双倍”,复数形式是doubles。
【举例】Homework is double at weekend. 在周末作业是双倍的。
【用法】作形容词, 意为“双倍的、两倍的、两用的”,在句中作定语或表语。
【举例】①I think you will get double harvest. 我想你们会有双倍的收成。②We’d like a double room. 我们想要一个双人间。
2. Maybe Brian and I can join you after supper. 晚饭后或许布莱恩和我会加入到你这里。
【用法】动词join在这里表示“加入”,如果表示“加入到某人的某种活动中”可用句式join somebody in …。
【举例】Lisa, can you join us in the game? 丽萨,你能和我们一起做游戏吗?
3. Well, it’s worth a try, even if I don’t find a planet. 好的,这值得一试,即使我没有发现行星。
【用法】even if意思是“即使、纵然”,引导让步状语从句,表示某种条件。
【举例】He will come on time even if it rains. 即使下雨,他还是会准时来的。
【拓展】在口语中,even if往往用在句首。
【举例】Even if he is poor, he always looks happy. 即使他很穷,但看上去他总是很快乐。
Lesson 28: The Study of Living Things I. Learning aims:
Master the new words:
Chip Taylor, biology, butterfly, migrate, fantastic, completely, grandchild, female, milkweed, chemical, puzzling
II. Learning important and difficult points:
1) Fantastic facts about the butterfly have been drawing Dr. Taylor’s attention.
2) Here, as many as 230 million butterflies spend the winter.
3) But in Mexico, people cut down the trees that the butterflies need to rest on because they want more land for farming.
4) This is both puzzling and interesting for many scientists.
Language Points:
1. fantastic
【用法】作形容词,意为“奇异的、极好的、了不起的”,在句中作定语或表语。
【举例】①I think this is a fantastic invention. 我想这是一个了不起的发明。②These flowers are so fantastic. They have many different colours. 这种花太奇异了。它们有很多不同的颜色。
2. chemical
【用法】作可数名词,意为“化学物质、化学制品”,复数形式是chemicals。
【举例】There are no chemicals in this kind of food. 这种食品中没有化学物质。
【用法】作形容词,意为“化学的、化学作用的”,在句中作表语或定语。
【举例】We can find chemical additives in many foods. 我们在很多食品中发现了化学添加剂。
3. Fantastic facts about the butterfly have been drawing Dr. Taylor’s attention. 这些有关蝴蝶的奇异的事实引起了泰勒先生的注意。
【用法】句中的have been drawing 是现在完成进行时,它由“助动词 have (has) + been + 现在分词”构成,当主语是第三人称单数时用助动词has,其他情况用助动词have。现在完成进行时主要表示从过去开始一直持续到现在的动作,这个动作是否延续下去,要根据上下文而定。
它往往与表示一段时间的时间状语连用,如:all the time, this month, all day, these few days, for a year, since a week ago等。
【举例】①She has been playing basketball after school this week. 这个星期她放学后一直打篮球。②Tony has been drawing in his bedroom all the afternoon. 托尼在卧室画了一下午。
4. This is both puzzling and interesting for many scientists. 对很多科学家来说这既令人费解又很有趣。
【用法】连词both…and…的意思是“……和……都,既……也……”,它可以连接句中句子成分相同的词语,如果用它连接主语时,谓语动词要用复数形式。
【举例】①She likes both sports and music. 她既喜欢运动,又喜欢音乐。②Both Li Ping and her mother take exercise every morning. 李萍和她妈妈每天早晨都进行锻炼。
Lesson 29: DNA—The Story of You I. Learning aims:
Master the new words:
DNA, blueprint, general, complex, twin, copy, repeat, pattern, identify, related, grandson, granddaughter, instruction
II. Learning important and difficult points:
1) In general, a blueprint is a drawing that shows how to put a house together with many different parts.
2) But building a living thing is far more complex than building a house.
3) Except for some twins, every living thing has its own unique DNA.
4) From your DNA, scientists can identify not only you, but also people who are related to you.
5) Your DNA has billions of instructions that explain why you are the way you are.
Language Points:
1. copy
【用法】作可数名词,意为“复制品、一本、一册”,复数形式是copies。
【举例】①This is just a copy. Have you found it? 这只是一个复制品。你发现了吗?② I borrowed two copies of magazines from the library. 我从图书馆借了辆本杂志。
【用法】作及物动词,意为“复制、抄写”,后加名词或代词作宾语。
【举例】Have you finished copying the words? 你抄写完单词了吗?
【应用】根据括号中所给汉语用适当词语填空。
We don’t need any ____________(复制品). Write them by hand.
答案:copies。表示“复制品”用名词copy,且这里是复数形式。
2. repeat
【用法】作及物动词,意为“重复、重述”, 后加名词或代词作宾语。
【举例】What about repeat the text for another time? 再重复一遍课文怎么样?
【拓展】在口语中,当没听清对方的话或没看清对方的动作要求对法重复时,为了表示客套,要用Pardon?或 Beg your pardon? 或I beg your pardon?
【举例】Pardon? I didn’t hear your words clearly. 请重复一遍好吗?我没听清你的话。
【应用】根据括号中所给汉语用适当词语填空。
The teacher ___________(重复)the sentences and I knew its meaning at last.
答案:repeated。表示“重复”用动词repeat,且这里是一般过去时。
语句详解
1. But building a living thing is far more complex than building a house. 但是构建一个有生命的东西比建一座房子复杂得多。
【用法】比较级前可以用much, even, still, far, a bit, a little, a lot 等词加以修饰。
【举例】①This unit is much easier than that one. 这个单元比那个单元容易得多。②This book is far more interesting than that one.这本书比那本书有趣得多。
答案:a little taller。此处用副词a little作状语,修饰后面的比较级taller。
2. Except for some twins, every living thing has its own unique DNA. 除了一些双胞胎外,所有有生命的东西都在自己独特的DNA。
【用法】except for用于表示对主要部分的肯定和对局部的否定。它不表示同类事物之间的关系,其意思是“除了……以外、除去为了……、如果不是”。
【举例】①Smith is a good man, except for his bad temper. 史密斯除了脾气不好外,是个好人。②Mother wouldn’t give him any money except for books and stationery. 除了买书和文具外,妈妈不给他任何钱。③Except for you, I would pass the exam. 如果不是你,我就会通过考试。
3. From your DNA, scientists can identify not only you, but also people who are related to you. 根据你的DNA, 科学家不仅能辨别出你,而且能辨别出与你有关系的人。
【用法】not only…but also…是等立连词,意思是“不但……而且……”,它可以连接句中句子成分相同的部分,如果用它连接主语时,谓语动词应该以but also后面的主语为准。
【举例】①She can sing not only Chinese songs but also English songs. 她不仅会唱中文歌曲,还会唱英文歌曲。②Not only I but also she has finished the work. 不仅我完成了工作,她也完成了工作。
【用法】短语be related to意为“与……有关系”,后加名词或代词作介词to的宾语。
【举例】I think Danny is related to this matter. 我想丹尼与这件事情有关。
Lesson 30: Science Affects Us I. Learning aims:
Master the new words:
affect, suggest, mobile phone, discovery, amazing
II. Learning important and difficult points:
1) First, get a jar full of water and a piece of cardboard.
2) The higher air pressure outside the jar holds the cardboard in place.
3) The experiment you did sounds interesting.
4) Scientific discoveries are making our lives better and better.
Language Points:
词汇详解
1. suggest
【用法】作及物动词,意为“建议、暗示”,后加名词、代词、动名词作宾语;也可用在句式suggest somebody to do something 这一句式中,表示“建议某人做某事”。
【举例】①They suggested building a new school. 他们建议建一所新学校。②I suggest you to do like me. 我建议你想我一样这么做。③His report suggested the huge loss. 他的报告暗示了巨大的损失。
【拓展】suggestion 是它的名词形式,意为“建议”,作可数名词,复数形式是suggestions。
【举例】They gave some useful suggestions at the meeting. 在会议上他们给我们提出了一些有用的建议。
【应用】用括号中所给词语的适当形式填空。
Nobody _____________(建议)repairing the machine by ourselves, so we had to have it repaired.
答案:suggested。表示“建议”用动词suggest,且这里是一般过去时。
2. discovery
【用法】作可数名词,意为“发现、发觉”,复数形式是discoveries。
【举例】This is an important discovery. We should pay more attention to it. 这是一个重要的发现。我们必须注意它。
【拓展】discover是及物动词,意为“发现”,后加名词、代词或宾语从句。
【举例】We have discovered their secrets. 我们已经发现了他们的秘密。
【应用】用括号中所给词语的适当形式填空。
Have you noticed those ____________ (discover)? They are helpful to us.
答案:discoveries。表示“发现”用名词discovery,且这里用复数形式。
语句详解
1. First, get a jar full of water and a piece of cardboard. 首先,取满满一罐子水和一张硬纸片。
【用法】句中的短语full of water用在名词jar之后作定语,不定式、介词短语、副词和定语从句都可用在名词后作定语。
【举例】①I have a lot of work to do. 我有很多要做的工作。(不定式在名词后作定语)②The eraser on the desk is Mary’s. 书桌上的橡皮是玛丽的。(介词短语在名词后作定语)③Did you meet John on your way home? 你在回家的路上遇见约翰了吗?(副词在名词后作定语)④
…………………………
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