【冀教版】七年级数学下册《【教学设计】单项式与单项式相乘》

【冀教版】七年级数学下册《【教学设计】单项式与单项式相乘》（共8篇）

【冀教版】七年级数学下册《【教学设计】单项式与单项式相乘》 篇1

冀教版七年级数学下册教学设计 单项式与单项式相乘

教学目标

知识与技能：

1.会进行单项式与单项式的乘法运算 2.灵活运用单项式相乘的运算法则 过程与方法：

1.经历探索乘法运算法则的过程，体会乘法分配律的作用和转化思想 2.感受运算法则和相应的几何模型之间的联系，发展数形结合的思想 情感、态度与价值观：

在学习中获得成就感，增强学好数学的能力和信心。教学重难点

重点：熟练地进行单项式的乘法运算 难点：单项式的乘方与乘法的混合运算

关键：明确混合运算中的运算顺序，熟练掌握幂的运算性质和单项式乘法法则

教具准备 投影仪、电脑 课时安排 1课时 教学设计

一、情景引入

1.教师引导学生复习整式的有关概念 整式的乘法实际上就是 单项式×单项式、单项式×多项式、多项式×多项式

教法说明：培养学生前后知识的连续性、一致性。

二、探索法则与应用

1.组织讨论：完成P79试着做做的练习，引导学生分组讨论单项式×单项式的法则（组织学生积极讨论，教师应积极参与学生的讨论过程，并对不主动参与的同学进行指导。）

2.在学生发言的基础上，教师总结单项式的乘法法则并板书法则。系数与系数

相同字母与相同字母 单独存在的字母

以上3点的处理办法，并让学生归纳解题步骤。

（学生刚接触，故要求学生按步骤解题，且提醒学生不能漏项。）3.例题讲解 例

1计算：

（1）4χ3χy；（2）；（3）（2χ）（3χ2y）2解：（1）4χ3χy(43)(χχ)y12χy； 223（2）(2χ)(3χy)(2)(3)(χχ)y6χy；

2213abcbc.32（3）21321143232abc(bc)a(bb)(cc)abc.323322例

2计算：

11（1）2ab23a2bc；

（2）ab2(5abc).22解：（1）2a12ab3a2bc 21(2)3(aaa2)(b2c)c2 3a4b3c；

（2）ab2(5abc)12221a2(b2)2(5abc)2

124ab(5abc)4

1(5)(a2a)(b4b)c4 5a3b5c4.（强调法则的运用）

4.练习：随堂练习P80.1题口答，学生讲解错误的理由，2题学生板书，发现问题及时纠正，可让学生辨析、指出错误，巩固法则。

三、课堂总结

指导学生总结本节课的知识点、学习过程等的自我评价。

（可畅所欲言，包括学习心得和困惑，互相帮助，互相促进。教师要鼓励学生发言，锻炼他们的语言表达能力。）

四、课堂小测

P80习题1（1）（3），2（2）（3）,3(3)

五、作业布置及预习任务

1、P80习题1（2）（4），2（4）,3(2)(4)）。

2、预习P81找知识点

六、板书设计

整式的乘法

例1

拓展例题

-----------------

----------------法则

--------------

----------------

-------------------------------

例2 强调----------------------------

《单项式与多项式相乘》教学反思 篇2

乘法分配律

单项式与多项式相乘单项式

与单项式相乘再把积相加。

单项式与多项式相乘时要提醒学生注意以下点：

1、积是一个多项式，其项数，与多项式的项数相同。

2、运算时，要注意多项式中的每一项前面的”+””－”号是性质符号，单项式乘多项式的每一项的结果，要先确定符号，然后再把项的绝对值相乘。

单项式乘以多项式相乘教学反思 篇3

《单项式乘以多项式》教学反思

1.教学过程始终围绕学习目标展开。我首先复习了单项式乘以单项式的知识，然后让学生自己得出本节课的研究内容，并举出了一个单项式乘以多项式的实例。

2.给学生创设了一个轻松和乐于向上的学习环境。在上课过程中，我关注学生的情感。新课堂改革，不应该是对原有课堂的全盘否定，原有课堂教学中对学生的表扬和鼓励应该在新课堂教学中得到更好的体现，因为学生的学习是认知和情感的结合，只有给了他们情感上的极大满足，学生才会获得渴望成功的动力，我们的自主学习活动才能收到应有的效果。这一堂课就在这样轻松愉悦的气氛中展开来，最终的效果也很好。单项式与多项式相乘时要提醒学生注意以下点: 1.积是一个多项式,其项数,与多项式的项数相同.2.运算时,要注意多项式中的每一项前面的”+””－”号是性质符号, 单项式乘多项式的每一项的结果,要先确定符号,然后再把项的绝对值相乘.3.单项式与多项式相乘，学生对乘法的分配律掌握得不好，出现漏乘，并且出现弄错符号的现象，有一部分学生乘法，还有对合并同类项和同底数幂相混淆的情况，或把加法看作是同底数幂来进行计算。

【冀教版】七年级数学下册《【教学设计】单项式与单项式相乘》 篇4

教学资料

科学记数法

【学习目标】

1、在探究表示较大数或较小数的过程中，体会科学记数法的意义；

2、会用科学记数法表示较大数或较小数.【学习重点】 熟练掌握用科学记数法表示较大数和较小数.【学习难点】 科学计数法表示数的意义 【预习自测】

情 境 引 入

⑴目前全世界人口约 6100000000人 ⑵太阳半径约696000千米 ⑶光的速度约300000000米每秒 这些大数不易读，也不好写，怎么办呢？

【合作探究】

1、把下列各数写成10的幂的形式：

(1)10=(2)100=(3)1000=(4)100 000 000 =(5)0.1=(6)0.01=(7)0.001=(8)0.00000001=

2、想一想 10n的意义和规律是什么？

3、辨一辨下列各等式成立吗？若成立它是怎样表示的，有什么规律？

5696000=6.96×100000=6.96×10 300000000= 6100000000= 仿照这种方法表示绝对值较小的数：0.002= 0.00021= 0.00000315=

4、说一说你能用一个数学的式子表出来吗？ 什么是科学记数法？ 【解难答疑】

1、我省为135万名农村中小学生免费提供教科书，减轻了农民的负担．135万用科学记数法可表示为（）A．0.13510 6B．1.3510

6C．0.13510

7D．1.3510

72、随着微电子制造技术的不断进步，电子元件的尺寸大幅度缩小，在芯片上某种电子元件大约只占0.000 000 7(平方毫米)，这个数用科学记数法表示为（）.－6－6－7－8A．7×10 B．0.7×10 C．7×10 D．70×10

3、纳米是非常小的长度单位，已知1纳米=106毫米，某种病毒的直径为100纳米，若将这种病毒排成1毫米长，则病毒的个数是（）A．102个 B．104个

C．106个

D．108个

4、据2007年5月27日中央电视台“朝闻天下”报道，北京市目前汽车拥有量约为3 100 000辆．则3 100 000用科学记数法表示为（）

75A．0.31×10 B．31×10

56C．3.1×10 D．3.1×10

5、国家游泳中心----“水立方”是北京2008年奥运会场馆之一的外层膜的展开面 积约为260000用科学记数法表示应为（）

64A、0.26×10 B、26×10

C、2.6×10 D、2.6×10

教学资料

学案设计

百度文库

教学资料

6、数据26000用科学记数法表示为2.6×10，则n的值是（）A.2 B.3 C.4 D.5 【反馈拓展】

1、用科学记数法表示下列各数

（1）100 000 000 =（2）-152 400 000=（3）941 300 000 =（4）30 150 093 000=（5）0.00000578 =（6）-0.00000067= 思考;10的指数如何更快的确定呢？ 指数的符号和什么有关系？

2、练一练：用科学计数法表示下列横线上的各数：（1）月球地球运行轨道的近地点距地球约为360 000千米，远地点距地球约为 410 000千米.（2）我国主要矿产资源的储藏量（1999年统计数据）：煤约为976 000 000吨，石油约为139 000 000吨，铁约为76 000 000吨.3、议一议

一个数用科学记数表示同学们已会表示了，反过来，已知一个用科学记数法表示的数你能知道它的原数是多少吗？

试一试 下列用科学记数法表示的数，原数是什么？

⑴5.6×10 = ⑵-3.2×10= 应用： 我国“杂交水稻之父”袁隆平主持研究的某种超级杂交水稻平均亩产820千克.某地今年计划载插这种超级杂交水稻30万亩,预计该地今年收获这种超级杂交水稻的总产量(用科学记数法表示)是().A.2．5×10千克 B.2.510千克 C.2.46×10千克 D.2.4610千克

【总结反思】

1.本节课我学会了： 还有些疑惑： 2.做错的题目有: 原因：

n585教学资料

【冀教版】七年级数学下册《【教学设计】单项式与单项式相乘》 篇5

析

教学目标：1掌握多项式乘多项式的运算法则

2了解多项式乘多项式法则与单项式乘多项式法则的联系

3能够活用多项式乘多项式法则进行化简运算

教学重点：熟悉掌握多项式乘多项式的运算法则

教学难点：能够活用多项式乘多项式法则进行化简运算

教学用具：几何画板

教学过程：

一、回顾旧识，导入新知

完成讲义第一大题第一小题，让学生回忆上节的内容单项式乘多项式的运算规律，同时投出同步

完成讲义第一大题第二小题，让学生阅读问题后得出不同的解决办法，小组内讨论，同时投出同步。学生回答问题时，依照学生回答内容演示不同的解法

提出问题：几种解法的答案是否一致？（引导学生指出三种解法化简后答案一致）

学生自行阅读书本，结合例题，得出多项式乘多项式的运算法则，并且知道多项式乘多项式法则与单项式乘多项式法则的联系。

二、小试身手，热身练习

完成讲义例（1）（2）（3）。考虑到是新学的内容，题目难度有梯度，所以每完成一题就评讲一题，并在黑板上演示做法全过程

三、巩固练习，分层拔高

布置学生完成讲义第五大题1，2，3小题，并鼓励优生思考完成有难度的4、小题。

四、评讲习题，堂小结

【冀教版】七年级数学下册《【教学设计】单项式与单项式相乘》 篇6

2. the usage of adj. and adv.

3. a dialogue about how to take a taxi

Teaching goals: 1: remember the mastery words

2. learn the difference of slow and slowly; quick and quickly

3. understand the meaning of the text

Key points: the usage of slow and slowly; quick and quickly

Difficult points: the usage of adj. and adv.

Teaching aids: word cards, audiotape, flashcard, slide projector

Type: dialogue

Teaching procedure

1. Class opening

1) Greet the students in everyday English. Make sure they can response correctly.

2) Duty report: They can say anything they like to say.

3) Check the homework of last lesson. Explain if necessary.

2. New lesson

Step 1 Lead in

Discuss the questions in “THINK ABOUT IT”

Do you like to take taxi? Why or why not?

Have you ever stayed in a hotel? When? Where?

Maybe they have many different answers. Gather them and then say “Today, Li Ming and his friends get to Beijing. They want to go to a hotel by taxi. Danny has a dialogue with the driver. Let’s look at what does he say to the driver.”

Step 2 Listen to tape with the following questions:

Why is Danny scared?

Can Danny speak Chinese?

Can the driver speak English?

Step 3 After listening to the text, discuss the questions with the students. Go through the dialogue at the same time. Deal with the language points. You can use the blackboard or the slide projector. Pay attention to the different usage of slow and slowly, quick and quickly.

Step 4 Listen to the audiotape again and let the students read after it.

Step 5 Practice

Have them read the text for a few minutes and then have them act out the dialogue in roles. Correct their pronunciation if any.

Step 6 Demonstrate quickly and slowly by performing an action quickly and slowly as you say the words. Point out the difference between “ I am quick/slow.” and “I am ___ing quickly/slowly.”

Ask for volunteers to perform actions quickly and slowly. Describe the volunteers’ actions to the class. Then ask the class to describe the actions.

Divide the class into small groups. Ask each group to make a dialogue about taking a walk on a busy street in Beijing. Let them use slow and slowly, quick and quickly.

Step 7 Deal with “LET’S DO IT”

Work in a small group. Imagine you are a tour guide. Your group members are on a trip to Beijing. Where do they want to go? Where do you take them?

Step 8 A test

词形转换

1) They eat many _____ . (noodle)

2) Look! They are ________ over there. (help)

3) Be ________ , or we will be late.(quickly)

4) The train is _________ tonight. (come)

5) Thank you for _______ me. (help)

6) They found that lost sheep ________. (quickly)

7) The bike is going _________ . (fast)

8) That old man is walking ________ . (slow)

9) That car is _______ (slowly), but this bus is _______ . (fast)

10) _________ , I can’t go down. (help)

3. Homework

1) understand the meaning of the text

2) remember the mastery words

3) finish the exercise of the workbook

the next reading in the student book

Lesson 18 Tian’anmen Square

Teaching content : 1. mastery words: laugh, fly, hard, quietly, worry, put

2. learn a dialogue about flying a kite

3. some word such as quiet and quietly, loud and loudly

Teaching goals: 1. understand the meaning of the text

2. remember the mastery words

3. learn some words of adj. and adv.

Key points: 1. there be…

2. the usage of adj. and adv.

3. some useful words and phrases

Difficult points: the usage of adj. and adv.

Teaching aids: audiotape, word cards, slide projector, a picture of Tian’anmen Square, a kite

Type: text

Teaching procedure

1. Opening class

1) Greet the students in everyday English. Make sure they can response in correct way.

2) Duty report.

3) Check the homework.

2. New lesson

Step 1 Lead in

Ask the students some questions :

Have you ever visited Tian’anmen Square? If yes, when? If no, why not?

Do you want to visit Tian’anmen Square? Why or why not?

You may give them some words to help them.

Step 2 Listen to the tape with the following questions:

What happens to Danny?

Can Jenny fly a kite?

Can Danny fly a kite?

Answer the questions together with the students and then discuss the text again. If they have any question, explain to them. Deal with the language points at the same time. Pay attention to the usage of loud and loudly, quiet and quietly.

Step 3 Listen to the audiotape again and let the students read after it. Give them a few minutes to practice the text. Correct the pronunciation when necessary. Then have them act out the text in roles.

Step 4 Practice

Divide the class into small groups. Ask each group to make up a dialogue about walking in Tian’anmen Square. Encourage the students to use as much vocabulary as possible from this unit (easy, hard, loudly, quietly, many, men, women, children, people). Encourage the students to be active and praise them for talking risks with English! The more they experiment, the more they learn.

Step 5 Deal with “LET’S DO IT”

Work with a parter. Draw a map of Tian’anmen Square. Describe your maps to each other. What are the people doing? Try to use loudly, quietly, slowly and quickly.

Step 6 A test

1.英汉互译

1) 放风筝 _____________ 2) 玩得痛快 __________ 3) 天安门 __________

4) 看见某人放风筝 _________ 4) hurt one’s arm _________

5) Let’s do sth. ___________ 6) laugh at _________

2. 词形转换

1)We often see boys ________ football. (play)

2) Tom is a ____ boy, he often doesn’t talk with others. (quietly)

3) The street is so busy, but the people like to walk ______ (happy)

4) I can’t hear your words, will you speak ________ (loud)?

5) Let’s _______ the basket on the table. (puts)

Step 7 If there is enough time, do the exercises in activity book.

Step 8 Summary

Today we learn a text about Li Ming and his friends. They are flying kites. There are so many people on the Tian’anmen Square. Some people are loud and some are quiet. After class you should understand the meaning of the text and try to use loud, loudly, quiet, quietly correctly.

3. Homework

1) understand the meaning of the text

2) remember the mastery words

3) finish the activity book in lesson 18

the next reading

Lesson 19 The Palace Museum

Teaching content: 1. mastery words: sky, film, camera, picture, smile, break, tail

2. a dialogue about taking pictures

3. some useful words

Teaching goals: 1. understand the meaning of the text

2. remember the mastery words

3.master the usage of some words and phrases

Key points: 1. express taking a picture

2. ask permission to do sth.: May I …?

Difficult points: 1. express what you see

2. express taking a picture

Preparations: a picture of the Palace Museum, a camera

Teaching aids: audiotape, pictures, a camera, flashcards and slide projector

Type: dialogue

Teaching procedure

1. Opening class

1) Greet the students in everyday English and make sure they can response correctly.

2) Everyday report in English.

3) Check the homework and explain if necessary.

2. New lesson

Step 1 Lead in

Discuss the questions in “THINK ABOUT IT”

Have you ever been to the Palace Museum? If yes, when?

What do you know about the Palace Museum?

Do you want to live there? Why or why not?

Today Li Ming and his friends go to the Palace Museum. The weather is fine. The palace is red and yellow. It’s beautiful. They take some pictures there. Now let’s join them.

Step 2 Listen to the tape of the text with the following questions:

What happens to Jenny?

What’s wrong with Danny’s nose?

What do they do for Danny’s nose?

What’s wrong with Danny’s tail?

After listening, discuss the questions with the students. Make sure they understand the whole text. Deal with any language point at the same time. Pay attention to the usage of the following words: sunny, help sb. (to) do sth., careful, fall, break

Step 3 Listen to the audiotape again and let them read after it.

Step 4. Have them read the text for a few minutes and then ask some students to act out the dialogue in roles. Pay attention to their pronunciation.

Step 5 Practice

Divide the class into small groups. Ask them to make up a dialogue about visiting the Palace Museum. Encourage the students to use much new vocabulary as they can.

Divide the class into small groups. Ask each group to make up a dialogue about taking pictures. Encourage the students to use as much vocabulary from this unit as possible (camera, picture, easy, hard, help, hurt, loudly, quietly, many, everyone, men, women, children, people, quickly, slowly)

As the students work on this dialogue, take real pictures of each group with your camera. Later make a poster of these photos to put up in class. Do this as a class project! Help the students write English sentences under each photograph to describe the action.

Step 6 Deal with “LET’S DO IT”

In a small group, write a dialogue about taking pictures. Where are you taking pictures? What funny things happen?

Step 7 A test

根据首字母完成下列单词

1) Can you sing? Yes, it’s e_______ .(容易)

2) Working out the problem is h______ . (难)

3) He b_______ that glass , look! He is crying. (打坏)

4) Don’t w________ , the classmates all help you. (着急)

5) Bad luck! He f________ off his bike. (掉下来)

6) Now Tom is putting the f______ in his c________ . (装胶卷)

Step 8 exercise

If time permits, do some exercises in activity book.

3. Homework

1) understand the meaning of the text

2) remember the mastery words

3) finish the activity book of lesson 19

read the next reading in lesson 20

Lesson 20 Let’s Write Home

Teaching content: 1. mastery words: letter, dear, dad, soon, bottom, address, stamp

2. a text about writing a letter

3. some useful expressions

Teaching goals: 1. understand the meaning of the text

2. remember the mastery words

3. find and use the list of mastery vocabulary in lesson 24

Key points: learn how to write a postcard

Learn how to write an envelope

Difficult points: write a letter

Preparations: postcards, letters, envelopes

Teaching aids: audiotape, postcards, envelopes, letters

Type: text

Teaching procedure

1. Opening class

1) greet the students in English and make sure they can response correctly.

2) Everyday report in English

3) Check the homework and explain something when necessary.

2. New lesson

Step 1 Lead in

Ask the following questions: Have you ever write a letter in Chinese?

Do you know how to write a letter in English?

Where do you put the address?

Where do you put the stamp?

Today we will learn how write a English letter.

Step 2 Listen to the tape of a letter. Then look through the text together with the students. Show the students some letters and envelopes and let them know how to write a letter. Learn the words: top, bottom, left and right. Show a letter to the students when explaining.

Step 4. Use objects in the classroom-such as the blackboard, a door or a window-to demonstrate top, left, right, bottom and corner. Ask for volunteers to show you the top, left, right and corner of objects in the classroom.

Step 5 practice

Divide the class into small groups. Ask each group to make up a dialogue about buying postcards. Why are they buying postcards? Who do they buy them for?What pictures do the postcards have?

Step 6 Play a game

Play “Opposites” with the new vocabulary and other vocabulary.

Step 7 Deal with “LET’S DO IT”

Make a postcard. Draw a picture on it. Include a place for writing a note, for the address and for the stamp. Write to a classmate. Do you know his or her address? Ask!

Step 8 If time permits, do some exercises in the activity book.

3. Homework

1) the remaining activities in the activity book

the next reading in the student book

Lesson 21Sending an E-mail

Teaching content: 1. mastery words: send, e-mail, show, welcome

2. a dialogue about sending an e-mail

3. an English song

Teaching goals: 1. understand the meaning of the text

2. remember the mastery words

3. some useful words and phrases

Key points: how to ask for help and how to send an e-mail

Difficult points: learn how to send an e-mail

Preparations : a postcard, a letter

Teaching aids: audiotape, slide projector, a postcard, a letter

Type: dialogue and song

Teaching procedure

1. Opening class

1) Greet the students in everyday English and make sure they can response correctly.

2) Duty report

3) Check the homework and explain something if necessary.

2. New lesson

Step 1 Lead in

Ask the following questions: Do you have a computer?

Where can you buy one?

Do you use e-mail?

Who do you like to send e-mail to?

Today we will learn a short dialogue about sending an e-mail.

Step 2 Listen to the tape with the following questions:

When will Danny go home?

Who does Danny send an e-mail to?

Where does Danny send his e-mail?

Answer the questions and discuss the dialogue with the students. Deal with the language points at the same time. You can use a computer and show the students how to send an e-mail. If they have any question you can help them.

Step 3 Listen to the audiotape again and let them read after it.

Step 4 Give them a few minutes to read the text. Then have them act out the dialogue in roles.

Step 5 Practice

Divide the class into small groups. Ask each group to make up a dialogue about writing and sending an e-mail. Encourage them to use as many different words as they can.

Step 6 Let’s sing a song

Play the tape for the students to listen.

Read through the songs together. Make sure the students understand the meaning of the song. Deal with any language point at the same time.

Step 7 Listen to the audiotape for a few times again and let them sing after it. Make sure they can sing the song themselves.

Step 8 Do some exercises in the activity book.

3. Homework

1) understand the meaning of the dialogue

2) learn to sing the song

3) finish the remaining exercises in activity book

the next reading

Lesson 22 The Great Wall

Teaching content: 1. mastery words: today, turn, traffic, light

2. a dialogue about visiting the Great Wall

3. some useful expressions

Teaching goals: 1. understand the meaning of the dialogue

2. remember the mastery words

3. learn to use some useful expressions

Key points: 1. follow the direction

2. some phrases: in an hour, arrive in, stop doing

Difficult points: some phrases

Teaching aids: a picture of the Great Wall, audiotape, slide projector

Type : dialogue

Teaching procedure

1. Opening class

1) Greet the students in English and make sure they can response correctly.

2) Duty report: they can say whatever they like to say

3) Sing the song learnt last lesson

4) Check the homework

2. New lesson

Step 1 lead in

Discuss the questions in “THINK ABOUT IT”

Have you ever climbed a mountain or walked a long way? Where?

What do you know about the Great Wall? How long is it? How old is it?

Encourage them to discuss the questions and give some words to help them if necessary.

Step 2 Listen to the tape with the following questions:

Why is Jenny unhappy with Danny?

Which bus do they take to the Great Wall?

How long does it take them to get to the Great Wall?

After listening, answer the questions together with the students. Learn the text and make sure they understand the meaning of the text. Deal with the language points at the same time. Pay attention to find and look for; in an hour, stop doing sth.

Step 3 listen to the audiotape again and let them read after it.

Step 4 Give them a few minutes to read the text and then have them act out the dialogue in roles.

Step 5 A test

选择填空

1) Look! Who ______ in the pool?

A. swims B. swimming C. is swimming

2) The cup of coffee is _______ you.

A. for B. of C. with

3) The little girl _____ a new bike.

A. is B. has C. have

4) Does he ______ a computer?

A. have B. has C. there is

Step 6 Deal with “LET’S DO IT”

Work in a small group. Write a song or a poem about the Great Wall. Make a poster for it with the words and some pictures. Practice your song or poem and teach it to your classmates.

Step 7 Activity book

In Number 1, the students can review the direction words.

In Number 2, the students match the correct words and pictures.

Number 3 is a listening exercise on the audiotape as follows:

Listen. Fill in the blanks.

a. Danny: This is a computer. You can send your friend an e-mail.

b. Jenny: This is a piece of paper. You can send your friend a letter.

Step 8 Summary

Today we know Li Ming and his friends go to the Great Wall. They take a no.919 bus to go there. When they get there they talk about sth. about the Great Wall. After class read the text fluently and remember the useful words.

3. Homework

1) understand the meaning of the text

2) remember the mastery words

3) finish the activity book

the next reading in student book

Lesson 23 Shopping in Beijing

Teaching content: 1. mastery words: gift, chopsticks

2. a dialogue about shopping in Beijing

3. some useful phrases

Teaching goals: 1. understand the meaning of the text

2. remember the mastery words

3. learn to ask about time

Key points：some sentences about shopping

ask about time

Do things slowly or quickly.

Difficult points: the usage of slowly and quickly

How to ask about time?

Teaching aids: some real things as gifts, some pictures, audiotape, slide projector

Type：dialogue

Teaching procedure

1. Class opening

1) Greet the students in everyday English and make sure they can response correctly.

2) Duty report: They can talk about weather, friends, family, classmates and so on.

3) Check the homework. Explain if necessary.

2. New lesson

Step 1 lead in

Talk about the questions in “THINK ABOUT IT”

Do you like to shop quickly or slowly? Why?

Where do you like to go shopping? Why?

Today Li Ming and his friends go to shop at Wangfujing. They buy many things as gift. What do they buy? Let’s go look?

Step 2 Listen to the tape with the following questions:

In the story, who shops quickly and who shops slowly? What do they buy/

Who will go to the hotel with the panda?

After listening, answer the questions and deal with the language points at the same time. Pay attention to the usage of go doing, with, gift and so on.

Step 3 listen to the audiotape again and let the students follow it.

Step 4 Give them a few minutes to practice the dialogue and then have them act out it in roles.

Step 5 Deal with “LET’S DO IT”

Write a paragraph. You go on a trip to Beijing and buy some gifts for your friends. For whom do you buy gifts? What do you buy? Read your paragraph to your classmates.

Step 6 A test

选词组句

1) They have a _____ meal. They eat their meal ______ . (quick, quickly)

2) The old man walks _____ . He is a ______ man. (slow, slowly)

3) The family are watching TV _____ . They are all very _____ .( quiet, quietly)

4) The students make a _______ noise. They are talking ______ .(loud, loudly)

5) It’s an ______ question . I can answer it _____ . (easy, easily)

6) Lucy is a _____ girl. She does everything _____ . (careful, carefully)

Step 7 If time permits, do some exercises in activity book.

3. Homework

1) understand the meaning of the text

2) remember the mastery words

3) finish the remaining exercises in activity book

【冀教版】七年级数学下册《【教学设计】单项式与单项式相乘》 篇7

一、教材分析

本节安排了两个主要教学环节，一是通过让学生数出30根小棒后提出“怎样做让别人一看就知道是30根？的问题，让学生体验3个十就是30，进而明白10个十就是100的道理。二是通过“摆一摆，再填空”。让学生了解100以内的数的组成。教学时，一方面要重视学生的操作活动，让学生真正去操作，在操作的过程中体验几个十就是几十的道理。另一方面要加深学生对十个10是100的理解，让学生多数，多操作。

二、教学建议

◆数小棒

1．教师提出数小棒的要求后，让每个学生独立操作。

2．交流各自摆的过程和结果。结合学生的操作使学生了解：1捆是10根（是一个十），3捆是30根，即“3个10是30”。

七年级下册生物复习提纲冀教版 篇8

第一节

1、食物 几种物质的性质

淀粉遇碘变蓝;含有蛋白质的液体与质量分数为10%的氢氧化钠和质量分数为3%的硫酸铜反应，会变成紫色;维生素C能使高锰酸钾溶液或吲哚酚试剂褪色。

2、六种营养物质的生理作用

糖类是人体的主要能源，也是构成细胞的重要成分。

蛋白质是构成细胞的基本物质，也是人体生命活动的物质基础。 脂肪是人体贮存能源的物质。

水是细胞的主要成分，没有水就没有生命。

无机盐是组成人体的重要成分，还参与人体内的代谢活动。 维生素对维持人体正常生命活动十分重要。

3、了解几种维生素的作用

维生素A预防近视缺失引起夜盲症;维生素B1缺失引起神经炎，严重脚气病;维生素C缺失引起坏血病;维生素D可促进钙、磷的吸收，儿童缺失引起佝偻病，成人引起骨质疏松。

4、热价：糖和蛋白质相同为17.15千焦，脂肪热价为38.91千焦，故相同质量的的脂肪释放的能量比糖和蛋白质要多一些。

第二节 食物的消化

1、关于“唾液在馒头消化过程中起的作用”实验中的注意事项

试管中加入“馒头渣”(相当于牙齿的咀嚼作用)和唾液后，“振荡摇匀”(舌的搅拌)，之后将其置于“37℃水浴加热”(口腔温度37℃，也是唾液淀粉酶发挥作用的最适温度)几分钟后取出，冷却后滴加碘液，发现试管中溶液颜色没有变化，原因是淀粉在唾液淀粉酶的作用下被分解成麦芽糖，遇碘不会变蓝。

2、消化的方式

a、物理消化：牙齿的咀嚼、舌的搅拌、事物的吞咽、胆汁对脂肪的乳化 b、化学消化：所有消化酶对食物的消化。

3、消化道和消化腺

消化道：口腔、咽、食道、胃(酸性环境)、小肠(主要消化器官)、大肠、肛门

消化腺：唾液腺(分泌唾液淀粉酶，将淀粉分解成麦芽糖)、胃腺(分泌胃蛋白酶)、肝脏(分泌胆汁乳化脂肪)、胰腺(分泌消化糖类、蛋白质、脂肪的消化酶)、肠腺(分泌消化糖类、蛋白质、脂肪的消化酶)

4、三种营养物质的消化

淀粉 → 麦芽糖 → 葡萄糖 蛋白质 → → 氨基酸 脂肪 → 脂肪微滴→ 甘油+脂肪酸

第三节 营养物质的吸收和利用

1、六种营养物质的吸收

口腔、咽、食道：基本没有吸收功能;

胃：吸收少量的水、无机盐和酒精;

小肠：吸收葡萄糖、氨基酸、甘油、脂肪酸以及大部分的水、无机盐和维生素;

大肠：吸收少量的水、无机盐和部分维生素。

(注：1、小肠是主要吸收器官，结构上小肠的环形皱襞和小肠绒毛增大了吸收面积;小肠绒毛的毛细血管和毛细淋巴管管壁都只有一层上皮细胞，物质容易通过。

2、水、无机盐和维生素不经过消化就可以被直接吸收)

2、三种营养物质的利用

葡萄糖：在细胞;内氧化分解提供能量，多余部分贮存备用;

氨基酸：在细胞内重新被合成蛋白质，作为人体生长发育、组织更新的原料; 甘油和脂肪酸：到体内合成脂肪。

第四节 食品安全

食品安全问题的分类：

1.细菌及其毒素污染引起的食品腐败变质问题;(举例：腐烂的食品、苍蝇叮过的食物等)

2.有毒化学药品及激素等引起的食品污染问题;(举例：工业食盐当成食盐使用、蔬菜残余农药、瘦肉精、红心蛋、毒水产、激素猪肉等)

3.新型种品种的安全问题，包括未经实践证明是无害的转基因食品、强化食品和保健食品等。

第二章 爱护心脏 确保运输

第一节 物质运输的载体

1、血液的组成：血浆和血细胞

⑴血浆：是物质运输的载体，不仅运输血细胞，还运输人体吸收的营养物质及细胞产生的代谢废物。(血浆是血液中加入抗凝剂后析出的液体，呈淡黄色;

不加抗凝剂血液凝固后析出的液体为血清。)

⑵红细胞：内含血红蛋白，血红蛋白在氧高的地方与氧结合，氧低时与氧分离。依靠血红蛋白特性为全身细胞输送氧。(红细胞或血红蛋白低于正常值表现为贫血，需补铁和蛋白质。)

⑶白细胞：可吞噬侵入体内病菌，对机体起防御和保护作用。(白细胞过少时身体抵抗力差容易出现炎症;白细胞过多时代表身体已经出现炎症) ⑷血小板：有止血和加速凝血的作用。(血小板过少伤口难愈合)

血液不仅有运输、防御和保护的作用，还有参与体液调节和调节体温等多种功能。

第二节 运输物质的器官

1、血管

动脉：把血液从心脏运往全身。动脉血流速度快，管壁厚、弹性大、管腔小。 静脉：把血液从全身运回心脏。静脉血流速度较慢，管壁薄、弹性小、管腔大。(大中型静脉中有半月形的静脉瓣，有防止血液倒流的作用。)

毛细血管：连接小动脉和小静脉的血管。血流速度极慢(利于与组织细胞进行物质交换)，管壁极薄(只有一层上皮细胞组成)，管径极细(只能使红细胞单排通过)。

⑵心脏的工作原理

A、心房收缩，心室舒张：血液由心房流向心室(房室瓣打开，动脉瓣关闭);

B、心室收缩，心房舒张：血液由心室流向动脉(房室瓣关闭，动脉瓣打开);

C、心房舒张，心室舒张：血液由静脉流入心房。

3、几个名词

每搏输出量：两个心室每搏动一次输出的血液量。

心输出量：衡量心脏工作能力大小的标志。=每搏输出量×每分钟搏动次数(脉搏或心率)。

每搏输出量与心肌收缩力有关，运动员心肌发达，搏动有力，因此心肌收缩力强，平时心率慢，每搏输出量大。

第三节 物质运输的路线

1、动脉血与静脉血的区分：

动脉血：含氧丰富，颜色鲜红 静脉血：含氧较少，颜色暗红

(注：一般来说动脉中都流的动脉血，静脉中流静脉血，但肺动脉中流的是静脉血，肺静脉中流的是动脉血。)

2、血液循环

肺静脉 → 左心房 → 左心室 → 主动脉 → 全身各级动脉 ↑ ↓

肺毛细血管 全身毛细血管 ↑ ↓

肺动脉 ← 右心室 ← 右心房 ← 上下腔静脉 ← 全身各级静脉 肺循环：右心室→肺动脉→肺毛细血管→肺静脉→左心房

体循环：左心室→主动脉→全身各级动脉→全身毛细血管→全身各级静脉→上下腔静脉→右心房

第三章：健肺强肾 精力充沛

第一节：呼吸

(一)：呼吸道和肺的功能

一：呼吸系统

呼吸道(鼻，咽，喉，气管，支气管)和肺

二：呼吸道的结构特点和功能

1：呼吸道以骨或软骨为支架，保证气体顺畅通过。

2：鼻毛，鼻黏膜，气管纤毛，气管腺细胞等结构对气体进行处理，使气体变得清洁，温暖，湿润

三：肺的结构特点：

肺泡数量多，总面积大。

肺泡壁很薄，由一层上皮细胞构成。

肺泡外包绕着丰富的毛细血管。

肺的功能：气体交换的场所。

(二)：肺通气是怎样实现的

一：肺通气：肺与外界进行气体交换的过程。是靠呼吸运动实现的。

二：呼吸运动：胸廓有节律的变大变小的过程。包括吸气运动和呼气运动。 三，1：肋间外肌和膈肌收缩，胸廓变大——吸气运动

2：肋间外肌和膈肌舒张，胸廓变小——呼气运动

四：实际用，1：经常参加体育锻炼的人，呼吸肌的舒缩能力增强;同时增多了参与气体交换的肺泡的数量。

2：肺活量测三次，并取最大值。

(三)：人体的气体交换

一：呼吸：人体与外界进行气体交换的过程。

二：呼吸的四个环节：肺的通气，肺泡内的气体交换，气体在血液里的运输，组织里的气体交换

三：气体交换的原理：气体的扩散作用

四：呼吸的实质(氧气的利用)

有机物+——→二氧化碳+水+能量(用于学习，运动，维持体温等)

(四)吸烟的危害

香烟中主要有害物质：焦油，尼古丁和一氧化碳

尼古丁：引起烟瘾主要物质;一氧化碳：与血红蛋白结合，降低血红蛋白的携氧能力。