人教英语必修2教案：unit3《computer—warming up and reading》(4)

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III. Web or World Wide Web

The World Wide Web is the part of the Internet that contains web sites and web pages. It is not used to describe WebPages that are used offline where net services are not available, or no computer network exists - such as Wikipedia on CD. In this case no real physical site exists other than the place where the computer is. Blog and Wiki capabilities will also not be available because these require a communication with other computers. IV. Radio

Radio is a communications invention. Though originally used to communicate between two people, it is now used to listen to music, news, and people talking. Radio shows were the predecessor to TV programs. V. DVD

DVD most commonly stands for “digital versatile disk”. It can play video that is of a higher quality than a VHS tape. VI. Two kinds of DVD

They can also hold 4.7 GB of information as opposed to the 700 MB that a CD can hold. A plus of using a DVD for a video is the ability to have interactive menus and bonus features such as deleted scenes and commentaries. VII. Email

Email (electronic mail) is a message, usually text, sent from one Internet user to another. Email is quicker than snail mail(mail) when sending over long distances and is

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usually free. To send or receive an email, a computer with a modem and telephone line connected to the Internet, and an email program are required. Email addresses are generally formated like this: login@server.(com or fr or org or uk or other).

Some companies let you send and receive email for free from a website. Gmail, Hotmail and Yahoo! do this. VIII. Human Here are two humans.

A man is on the left and a woman is on the right. A human or human being is a person, like you. A male human is a man, a female human is a woman. If you think about all humans in the whole world, they are called humanity. In the past, people have also used man and mankind to mean all humans.

Humans are called Homo sapiens by scientists. Humans are an animal species that belongs to the group called primates. Monkeys are primates too, but the primates most like people are gorillas and chimpanzees. Most scientists think that chimpanzees and humans came from a common ancestor by what is called evolution. Other animals even more like humans than chimpanzees once lived too, but they are now extinct.

Human rights are those things that everyone deserves and the way they should be treated by other people.

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