人教版 必修2 Unit3 Computers Reading 教案

M2 Unit 3 Computer

Period 1:Warming up

(WHO AM I?)

Warming up

This section is an introduction to the topic．It is to get the students thinking about the

different ways computers can be made．Do this part of the lesson in pairs and as a

speaking activity．

Warming up by talking about computer

Look at the pictures on page 17. What are they? What do they have in common? Yes,

they are computers. Then what is a computer?

A computer is a machine which stores knowledge in its memory and does calculations

on that knowledge. This knowledge is stored 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.

Draw on the blackboard a diagram to illustrate the influence of the computer and the

Internet over the school education．Below is a diagram you may like to use．Ask

students to look at the diagram and consider, ”What changes have computers and the

Internet brought to schools? What changes will they bring to schools in the

future?”Ask the Ss to work in groups and to make a list of the possible changes they

can think of．When most of the groups have their lists ready, the teacher can hold a

class discussion．Write down the major changes the students think of under / beside

the diagram．The teacher can add one or two changes that may affect their own

teaching．For example, “Computers and the Internet can help busy parents contact

teachers by email．”The teacher can end the task with a brief summary, or hold a

further discussion to find out students' personal opinions about the changes．For

example, ask them, “Do you like all these changes? Why and why not? What changes

do you like / dislike?”

Some information:

计算机室

A computer frequently requires a boot device. The boot device contains the

computer’s operating system and data. Computer programs can be installed onto a

computer. Some people think that computers are less useful if they do not have access

to the Internet. They think this because the Internet allows the computers to send and

receive data and email across the world.

曙光3000巨型计算机

A computer is now almost always an electronic device. It usually contains materials

which are toxic; these materials will become toxic waste when disposed of. When a

new computer is purchased in some places, laws require that the cost of its waste

management must also be paid for. This is called product stewardship.

In some countries old computers are recycled (melted down) to get gold and other

metals. This is dangerous, because this procedure releases the toxic waste into the

water and soil.

Computers become obsolete quickly. Very often they are given away and new ones

replace them within two or three years. This makes the problem worse. Computer

recycling is thus common. Many projects try to send working computers to

developing nations so they can be re-used and will not become waste as quickly.

Computer jargon 计算机行话

Computer jargon means words to do with computers and surrounding topics.

Knowing what these words mean can help you know more about computers. Some

people use these words to impress other people (Also known as buzzwords).

Examples of jargon:

Bit - The smallest data unit, can either be a “0.” or a “1.”.

Byte - unit of data. See also Kilobyte, Megabyte, Gigabyte and Nibble

CPU –Central Processing Unit, Another name for processor

Data - Information stored on a computer

Disk - A place to store data.

Email - Electronic mail.

GHz - Gigahertz. Used often incorrectly to describe the speed of a processor. But with

some 2.4 GHz processors faster than 3.6 GHz ones, it is clear that it is just a salesman

trick.

Load - Get data from a disk

Nibble - Half a Byte

Save - Put data on a disk

RAM – random-access memory(随机存取存储器), the more the better.

USB - Universal Serial Bus（通用串行总线，一种简化了插接多种附件的薄型插座）

WWW - World Wide Web, part of the Internet

Period2-3 Pre-reading & Reading

Pre-reading

This can be a continuation of the Warming Up．Let the students discuss the questions

set out in the Student's Book．

1. Questioning and answering What do you know about computer?

●Electronic machine capable of performing calculations and other manipulations of

various types of data, under the control of a stored set of instructions. The machine

itself is the hardware; the instructions are the program or software. Depending upon

size, computers are called mainframes, minicomputers, and microcomputers.

Microcomputers include desk-top and portable personal computers.

●A multi-function electronic device that can execute instructions to perform a task.