【优质课件】人教版高中英语必修二Unit 3《Computers》写作园地优秀课件.ppt
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人教版高一英语必修二unit3 computers (reading)精品课件
1.I’m also a machine. But I’m small, so you can put me in your pocket. 2.There are ten numbers on me. 3.And you can use me to talk to others even in a far-away place.
While -reading(2): timeline 1642: The computer began as a calculating machine. 1822: The Analytical Machine was built by Charles Babbage.
1936: The computer grew rapidly both in size and
an answer quicker than any person?
2. I totally changed my shape, because 3. Many new applications have been found for me, such as 4. (translation) Over time my memory has . .
While-reading(3):
2.I totally changed my shape, because my memory was first stored in tubes, then on transistors and later on very
small chips.
I totally changed my shape！
Who am I?
computer
Reading
WHO AM I?
While-reading(1):
人教版高中英语 必修二 Unit3 《Computers ---Reading》 课件 (共32张PPT)
C. Charles Turing. D. Alan Babbage.
2. When was the “universal machine” built?
A. In 1822.
B. In 1642.
C. In 1936.
D. In 1970.
Scanning
3. When was the computer the biggest?
Discussion
Brainstorm a list of things that you, your school and your family use computers for. Think about what you would have to do if you could not use computers any more.
Reading
WHO AM I?
Skimming to get
general ideas
Reading Comprehension Complete the chart below.
Over time I have been changed quite a lot.
1 calculating machine 2 analytical machine 3 universal machine 4 PC 5 laptop
D. d. b. a. c.
Quiz
Retell the text by filling the following blanks.
I began as a _c_a_lc_u_l_a_t_in_g_ _m__a_ch__in_e_ in 1642 in France. In 1822 I was built as an
人教版必修二Unit 3《Computers Writing》ppt课件
want to carry on and read all of it．
3. The article itself is in the smallest
sized writing, but contains all the
information about the story．
The students can use the information they have gained from their interview with Hua Fei to write the article. It should be in the third person.
is made with used recycled materials
which come to terms with environment
protection at present. The PEP is
especially popular with young people
and the past 10 days have seen a rapid
Sample writing
My robot’s name is Yanyan. It is a 321 model android. It works for me and looks after my library. Its job is to store all the books that I borrow from the library or from school. Of course Yanyan’s brain is as large as mountain so work like that is no trouble at all.
3. The article itself is in the smallest
sized writing, but contains all the
information about the story．
The students can use the information they have gained from their interview with Hua Fei to write the article. It should be in the third person.
is made with used recycled materials
which come to terms with environment
protection at present. The PEP is
especially popular with young people
and the past 10 days have seen a rapid
Sample writing
My robot’s name is Yanyan. It is a 321 model android. It works for me and looks after my library. Its job is to store all the books that I borrow from the library or from school. Of course Yanyan’s brain is as large as mountain so work like that is no trouble at all.
【人教版】必修二 unit 3 computers grammar优质课件
Where has he been sent to study the new technology?
【人教版】必修二 unit 3 computers grammar优质课件
【人教版】必修二 unit 3 computers grammar优质课件
Great changes ______B__ in the city , and a lot of
A pen-like computer has already been developed.
Can you make more sentences similar to the sentences above? “have/has been done ?”
?
【人教版】必修二 unit 3 computers grammar优质课件
【人教版】必修二 unit 3 computers grammar优质课件
【人教版】必修二 unit 3 computers grammar优质课件
1. ------HSoinwcleo1n9g9_0_.B___ at this job?
A. were you employed B. have you been employed
The buildings; destroy ; earthquake
【人教版】必修二 unit 3 computers grammar优质课件
Discovering: Do the underlined parts have
something in common? 1. A calculating machine has been replaced with
• 三、 巩固练习
1.－How many times______ not to play with fire?
【人教版】必修二 unit 3 computers grammar优质课件
【人教版】必修二 unit 3 computers grammar优质课件
Great changes ______B__ in the city , and a lot of
A pen-like computer has already been developed.
Can you make more sentences similar to the sentences above? “have/has been done ?”
?
【人教版】必修二 unit 3 computers grammar优质课件
【人教版】必修二 unit 3 computers grammar优质课件
【人教版】必修二 unit 3 computers grammar优质课件
1. ------HSoinwcleo1n9g9_0_.B___ at this job?
A. were you employed B. have you been employed
The buildings; destroy ; earthquake
【人教版】必修二 unit 3 computers grammar优质课件
Discovering: Do the underlined parts have
something in common? 1. A calculating machine has been replaced with
• 三、 巩固练习
1.－How many times______ not to play with fire?
高中英语人教版必修2 Unit 3 Computers 课件
What’s next?
carry things work in wars work for us in Mars
Activity 2 Thinking Q: In what ways is the computer used？
communicate with…
Watch movies & TV plays
More knowledge about computers
1. What is IT? Information Technology.
2. What is CPU? Central Processing Unit.（中央处理器） 3. What is WWW? World Wide Web. 4. What is the English for “科学技术”? science and technology.
listen to music
do shopping
search for …
play computer games
Besides, we can … with computers
• send e-mails instead of letters;
• read news at home and abroad;
register 注册，登记 software 软件
download 下载
hardware 硬件
Consolidation
• Complete the sentences with proper words. 1. We should use computers properly and
never be a m_o_u_se__ potato. 2. In the accident he e_s_ca_p_e_d_ being killed. 3. You can input the capital letters when you
精选最新 人教版高中英语 必修二 Unit3 《Computers ---Reading》 课件 (共25张PPT)
Computers are devoted friends and helpers of
now the__h_u_m__a_n_r_a_c_e_. ______
Careful Reading
Para 1: Over time I have been changed quite a lot.
calculating machine
1822 1936Fra bibliotekThe Analytical Machine was made by Charles Babbage.
Alan Turing wrote a book about how computers could be made to work as_a__u_n_i_v_e_rs_a_l_m__a_c_h_i_n_e.
Mobile/cell phone
I am an electronic machine that can store, organize and find information, do calculations and control other machines. My nickname is “PC”.
World Wide Web
Para 3: Since the 1970s many new applications have been found for me.
communication finance trade robots mobile phones medical operations space rockets
After Reading
Summary of the text
It’s known to us all that the computers is one of the most important inventions in the 20th century. Though it’s widely used in our daily life, it began only as a _c_a_lc_u_la_t_in_g_ machine in 1642. In 1822, the _a_n_a_ly_t_ic_a_l_machine was made by Charles Babbage. At that time, after the computer was _p_r_o_gr_a_m__m_e_d by an operator who used cards with holes, it could “think” logically and produce an answer _q_u_ic_k_e_r_ than any person. With the time going by, the computer has been made _s_m_a_l_le_r__. Later, computers were __co_n_n_e_c_te_d__ with each other. The information could be _s_h_a_re_d__.
now the__h_u_m__a_n_r_a_c_e_. ______
Careful Reading
Para 1: Over time I have been changed quite a lot.
calculating machine
1822 1936Fra bibliotekThe Analytical Machine was made by Charles Babbage.
Alan Turing wrote a book about how computers could be made to work as_a__u_n_i_v_e_rs_a_l_m__a_c_h_i_n_e.
Mobile/cell phone
I am an electronic machine that can store, organize and find information, do calculations and control other machines. My nickname is “PC”.
World Wide Web
Para 3: Since the 1970s many new applications have been found for me.
communication finance trade robots mobile phones medical operations space rockets
After Reading
Summary of the text
It’s known to us all that the computers is one of the most important inventions in the 20th century. Though it’s widely used in our daily life, it began only as a _c_a_lc_u_la_t_in_g_ machine in 1642. In 1822, the _a_n_a_ly_t_ic_a_l_machine was made by Charles Babbage. At that time, after the computer was _p_r_o_gr_a_m__m_e_d by an operator who used cards with holes, it could “think” logically and produce an answer _q_u_ic_k_e_r_ than any person. With the time going by, the computer has been made _s_m_a_l_le_r__. Later, computers were __co_n_n_e_c_te_d__ with each other. The information could be _s_h_a_re_d__.
人教版高中英语 必修二 Unit3 《Computers ---Reading》 课件 (共32张PPT)
True or False 1. My real father was Charles Babbage,
who wrote a book and built me in 1936. 2. After I got my new transistors in the
1960s, I became smaller but cleverer and quicker. 3. I was brought into people’s homes in the 1970s. 4. Since my birth I have been built to take the place of the human race.
PC
Personal Computer
Can you tell the development of computers?
abacus calculator huge
PC
computer
What’s next?
robot
PDA
laptop
What is a computer?
A computer is a machine which keeps knowledge in its memory and does work on that knowledge. This knowledge is kept in symbols; it is called data. A computer usually has a monitor to show results. However, some computers can speak. These computers can be used for voice mail.
Scanning
who wrote a book and built me in 1936. 2. After I got my new transistors in the
1960s, I became smaller but cleverer and quicker. 3. I was brought into people’s homes in the 1970s. 4. Since my birth I have been built to take the place of the human race.
PC
Personal Computer
Can you tell the development of computers?
abacus calculator huge
PC
computer
What’s next?
robot
PDA
laptop
What is a computer?
A computer is a machine which keeps knowledge in its memory and does work on that knowledge. This knowledge is kept in symbols; it is called data. A computer usually has a monitor to show results. However, some computers can speak. These computers can be used for voice mail.
Scanning
人教版高中英语 必修二 Unit3 《Computers ---Reading》 课件 (共32张PPT)
Homework
1. Read the text after class and look for more information about the development of the computer and its applications.
laptop
I am so small in size that I can fit in your hand. I usually have a small screen usually bigger than a digital phone, however smaller than the smallest laptop, I’m a great way to store telephone numbers, access the internet, make calculations, and so on. Do you know who I am?
_a_n_a_ly_t_i_ca_l_ m__a_c_h_i_n_e_. Then in 1936 Alan Turing wrote a book and built a _u_n_i_v_e_rs_a_l _m_a_c_h_i_n_e_. As the years have gone by, I have been made _sm__a_l_le_r_ and _s_m__a_ll_e_r_ but I became __cl_e_v_e_r_e_r_ and _q_u__ic_k_e_r__.
True or False 1. My real father was Charles Babbage,
who wrote a book and built me in 1936. 2. After I got my new transistors in the
高中英语人教版必修二《Unit3 Computers》课件
Fill in the blanks
I am a(n) ___st_r_ik_e_rin an android football team.
Self
I look like a human and I’m as big as a
introductio human.
n
My computer ___c_h_ip_s_ help me move and
= ___W_h_i_le__d_o_i_n_g_h_i_s_E_n_g_li_s_h________ ___h_o_m_e_w__o_r_k_, _h_e_f_e_ll_a_s_le_e_p__. _____
5. Then she prepares reliable moves to use if a new situation arises. arise vt. 产生，产生； 站起来，起身；起床；上升， 升起
拓展
in the way或in one’s way 挡道，碍事 反义词组：out of the way in any way 不管如何，不管怎样 in no way 决不 注意：置于句首时，句子用部分倒装语序。如：
You’ll have to move — you are in my way. Please keep out of the way. I must finish the work today in any way. Teaching in school can in no way be separated from practice. In no way did he admit that he was wrong.
4) A heavy smoke arose and hung over the town.
人教版高一英语必修二 Unit 3 Computers writing 课件(共18张PPT)
From then on I worked hard to get into university.
Now I am working in a computer company designing new programs for computers.
As I grow older I realize how much my life has been connected with my interest in radios!
• As I grow older I realize how piano has greatly influenced my life!
improvemeWnhtysyou "didn't"?
• e.g.1.When I was young my mother asked me to play the piano. But I didn't.
Unit 3. Computers
writing class
Timeline of "who am I"
1642:The computer began as a calculating machine.
1822:The analytical machine was made by Charles Babbage.
• At that time I felt that I was fed up with the boring practice. My thought of giving up taking part in the competition became even stronger when I heard my friends shouting in the backyard.
Now I am working in a computer company designing new programs for computers.
As I grow older I realize how much my life has been connected with my interest in radios!
• As I grow older I realize how piano has greatly influenced my life!
improvemeWnhtysyou "didn't"?
• e.g.1.When I was young my mother asked me to play the piano. But I didn't.
Unit 3. Computers
writing class
Timeline of "who am I"
1642:The computer began as a calculating machine.
1822:The analytical machine was made by Charles Babbage.
• At that time I felt that I was fed up with the boring practice. My thought of giving up taking part in the competition became even stronger when I heard my friends shouting in the backyard.
高中英语unit 3 computers课件新人教版必修2
A. Since the 1970s people have discovered new use for me.
B. Since the 1970s people have found me many new rules.
Listening
I have been changed quite a lot over time. I began as a calculating machine in 1642 in France. In 1822 I was built _______ ________ analytical ______. machine Then in 1936 Alan Turing wrote a as an _______ universal ______. machine As time went by, I was book and built a _______ made smaller. Since the 1970s, I have been used in offices laptop and homes, first as a ___ PC and then as a _______. These changes only became possible as my memory tubes then on transistors improved. First it was stored in ____, _______ chips In the 1960s they gave me and later on very small ____. network Now people call it the a family connected by a _______. World _____ Wide Web _____ ____ or the Internet. Many new applications have also been found for me. I have been widely applied in communication ___________, finance, trade ____, mobile phones operations and _____ space robots, _____ _____, medical ________ rockets happiness that I am a ______. I am now filled with ________ friend and helper of humans.
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题型三 分段函数模型 【例 3】 某厂生产某种零件，每个零件的成本为 40 元， 出厂单价定为 60 元，该厂为鼓励销售订购，决定当一次订购量 超过 100 个时，每多订购 1 个，订购的全部零件的出厂单价就 降低 0.02 元，但实际出厂单价不能低于 51 元． (1)当一次订购量为多少个时，零件的实际出厂单价恰降为 51 元？ (2)设一次订购量为 x 个，零件的实际出厂单价为 P 元，写 出函数 P＝f(x)的表达式；
(1)若该公司的年产量为 x(单位：百件)，试把该公司生产并 销售这种产品所得的年利润表示为年产量 x 的函数；
(2)当这种产品的年产量为多少时，当年所得利润最大？
解 (1)当 0<x≤5 时，产品全部售出，当 x>5 时，产品只 能售出 500 件．
∴f(x)＝55x×－512－x221× －502.5－＋00..52＋ 5x0.205<xx≤x5>5，， 即 f(x)＝－12x2＋4.75x－0.50<x≤5，
误区警示 忽视实际问题中变量取值范围改错 【示例】 如图，有一直角墙角，两边的长度足够长，在 P 处有一棵树与两墙的距离分别是 a 米(0<a<12)、4 米，不考虑树 的粗细．现在想用 16 米长的篱笆，借助墙角围成一个矩形的花 圃 ABCD，并要求将这棵树围在花圃内或在花圃的边界上，设 BC＝x(米)，此矩形花圃的面积为 y 平方米．
综合，因此应用也十分广泛．
试一试：用自己的语言叙述建模流程
提示 根据题意设出相应的量→列函数解析式→求解→回 归检验→结论．
想一想：用函数模型解决实际问题时，函数的解与实际问 题的解有何关系？
提示 用函数模型解实际问题时，求出函数的解一定要代 回实际问题检验，只有符合实际问题，才是实际问题的解．否 则，应舍去．
题型二 二次函数模型 【例 2】 某公司通过报纸和电视两种方式做销售某种商品 的广告，根据统计资料，销售收入 R(万元)与报纸广告费用 x1(万 元)及电视广告费用 x2(万元)之间的关系有如下经验公式： R＝－2x21－x22＋13x1＋11x2－28. (1)若提供的广告费用共为 5 万元，求最优广告策略；(即收 益最大的策略，其中收益＝销售收入－广告费用) (2)在广告费用不限的情况下，求最优广告策略(其中 x1，x2 ∈N)
[规范解答] (1)设每个零件的实际出厂价恰好降为 51 元时， 一次订购量为 x0 个，则 x0＝100＋600－ .0251＝550(个)．因此，当一 次订购量为 550 个时，每个零件的实际出厂价恰好降为 51 元.
…………………………………………………………….3 分 (2)当 0<x≤100 时，P＝60；当 100<x≤550 时， P＝60－0.02(x－100)＝62－5x0； 当 x>550 时，P＝51.
(1)x 在什么范围内，学生的接受能力逐步增强？x 在什么范 围内，学生的接受能力逐步降低？
(2)第 10 分钟时，学生的接受能力是多少？ (3)第几分钟时，学生的接受能力最强？
解 (1)y＝ －0.1x2＋2.6x＋43＝－0.1(x－13)2＋59.9. 所以，当 0≤x≤13 时，学生的接受能力逐步增强； 当 13≤x≤30 时，学生的接受能力逐步下降． (2)当 x＝10 时，y＝－0.1×(10－13)2＋59.9＝59. 即第 10 分钟时，学生的接受能力为 59. (3)当 x＝13 时，y 取最大值． 所以，在第 13 分钟时，学生的接受力最强．
单击此处进入 活页规范训练
如何写描述物品的说明文 [写作指南]
名师点睛 解实际应用题的步骤 求解函数应用问题的步骤是(四步八字)： (1)审题：弄清题意，分清条件和结论，选择数学模型； (2)建模：利用数学知识，建立相应的数学模型； (3)求模：求解数学模型，得出数学结论； (4)还原：将数学问题还原为实际问题的意义.
题型一 一次函数模型 【例 1】 某电脑公司在甲、乙两地各有一个分公司，甲分 公司现有电脑 6 台，乙分公司有同一型号的电脑 12 台．现 A 地某单位向该公司购买该型号的电脑 10 台，B 地某单位向该公 司购买该型号的电脑 8 台．已知甲地运往 A、B 两地每台电脑 的运费分别是 40 元和 30 元，乙地运往 A、B 两地每台电脑的 运费分别是 80 元和 50 元．
写出 y 关于 x 的函数关系，并求 BC 为何值时，花圃面积最 大？
[错解] 由已知 AB＝16－x(米)， ∴y＝x(16－x)＝－x2＋16x. 由 y＝－x2＋16x＝－(x－8)2＋64，对称轴为 x＝8. ∴当 x＝8 时，ymax＝64. 即当 BC＝8 时，花圃面积最大． 思维突破 错解的原因是没有考虑二次函数的定义域，直接 套用求二次函数的最值公式，对于有实际背景的二次函数问题， 一定要充分考虑自变量实际取值范围．
(2)当地球表面大气的温度是 29 ℃时，3 km 上空的温度是 多少？
解 (1)由题意知 y－a＝kx(0≤x≤12，k<0)，即 y＝a＋kx. ∵当 x＝12 时，y＝－55，∴－55＝a＋12k，解得 k＝－551＋2 a， ∴当 0≤x≤12 时，y＝a－551＋2 ax， ∴所求的函数关系式为 y＝a－551＋2 ax(0≤x≤12)． (2)当 a＝29，x＝3 时，y＝29－551＋229×3＝8(℃)， 即当地球表面大气的温度是 29 ℃时，3 km 上升的温度是 8 ℃.
12－0.25xx>5.
(2)当 0<x≤5 时，f(x)＝－12x2＋4.75x－0.5， ∴当 x＝4.75(百件)时，f(x)有最大值， f(x)max＝10.781 25(万元)． 当 x>5 时， f(x)max＝12－0.25×5＝10.75(万元)． ∴当这种产品的年产量为 475 件时，利润最大．
(3)当销售商一次订购 500 个零件时，该厂获得的利润是多 少元？如果订购 1 000 个，利润又是多少元？
(工厂售出一个零件的利润＝实际出厂单价－成本)
审题指导 本题考查了一次函数、二次函数等函数关系，及 分段函数的最值求法．
【解题流程】 一次订购量x0与出厂单价关系 ―→ 列等式求x0 ―→ 分段表示P与x关系 ―→ 利润L与x的关系 ―→ 求最值
律不同，可以先将其当作几个问题，将各段的变化规律分别找出
来，再将其合到一起，要注意各段变量的范围，特别是端点值．
【训练 3】 某公司生产一种产品，每年投入固定成本 0.5 万元，此外每生产 100 件这种产品还需要增加投资 0.25 万元， 经预测可知，市场对这种产品的年需求量为 500 件，当出售的 这种产品的数量为 t(单位：百件)时，销售所得的收入约为 5t－ 12t2(万元)．
(1)设甲地调运 x 台至 B 地，该公司运往 A 和 B 两地的总运 费为 y 元，求 y 关于 x 的函数关系式．
(2)求总运费不超过 1 000 元，问能有几种调运方案？ (3)求总运费最低的调运方案及最低运费．
[思路探索] 涉及电脑台数与运费的关系，属于一次函数类 型．
解 (1)甲地调运 x 台到 B 地，则剩下(6－x)台电脑调运到 A 地；乙地应调运(8－x)台电脑至 B 地，运往 A 地 12－(8－x)＝(x ＋4)台电脑(0≤x≤6，，L＝6 000；当 x＝1 000 时，L＝11 000. 因此，当销售商一次订购 500 个零件时，该厂获得的利润 是 6 000 元；如果订购 1 000 个，利润是 11 000 元………12 分 【题后反思】 分段函数主要是每一段自变量变化所遵循的规
规律方法 二次函数模型根据实际问题建立函数解析式后 可利用配方法，判别式法、换元法及单调性等方法求函数的最 值．
【训练 2】 心理学家发现，学生对概念的接受能力 y 与提 出概念所用的时间 x(单位：分)之间满足函数关系式 y＝－0.1x2 ＋2.6x＋43(0≤x≤30)，y 值越大，表示接受能力越强．
(2)∵广告费用不限， ∴R(x)＝f(x)＋g(x)－28， 其中 f(x)＝－2x21＋13x1，g(x)＝－x22＋11x2， ∵x1，x2∈N， ∴f(x)max＝f(3)＝21， g(x)max＝f(5)＝f(6)＝30. 欲使 w 最大，所以 g(x)取最大值时 x2＝5， 此时 w＝21＋30－28－8＝15. 即报纸广告费用为 3 万元，电视广告费用为 5 万元时为最 优广告策略．
则总运费 y＝30x＋40(6－x)＋50(8－x)＋80(x＋4)＝20x＋ 960，
∴y＝20x＋960(x∈N，且 0≤x≤6)． (2)若使 y≤1 000，即 20x＋960≤1 000，得 x≤2. 又 0≤x≤6，x∈N， ∴0≤x≤2，x∈N. ∴x＝0,1,2，即能有 3 种调运方案．
[正解] 由已知 AB＝16－x(米)，∴y＝x(16－x)＝－x2＋16x. 又 x≥a,16－x≥4，∴a≤x≤12. 即 y＝－x2＋16x，x∈[a,12]． 由 y＝－(x－8)2＋64，对称轴为 x＝8，又 0<a<12， ∴当 0<a≤8，x＝8 即 BC＝8(米)时，ymax＝64(米 2)． 当 8<a<12 时，y 在[a,12]上递减，∴x＝a. 即 BC＝a 米时，ymax＝－a2＋16a(米 2)． 追本溯源 在实际问题中，要根据图形或已知条件先求出自 变量 x 的取值范围，然后利用数学知识求解.
自学导引
几种常见的函数模型
(1)一次函数模型：f(x)＝ kx＋b (k、b 为常数，k≠0)；
(2)反比例函数模型：f(x)＝ kx＋b(k、b 为常数，k≠0)；
(3)二次函数模型：f(x)＝ ax2＋bx＋c
(a、b、c 为常数，a≠0)；
(4)分段函数模型：这个模型实际是以上两种或多种模型的
Unit 3 Computers
写作园地