Almost everyone knows that air pollution is (危险的) to people's health. However, not all people know that noise is a kind of pollution (也).
A person who works and (居住) in a noisy place often talks in a loud (嗓音) so that other people can hear him. Lots of people living near airports can hardly hear anything. Many (年轻的) people in America can hear no better (比) old people, because they always listen to loud (流行的) music.
What's more, machines and (小汽车) are producing much noise all the time. In China, the government is (努力) to do something to (阻止) the noise pollution, and return the good environment to people.
The Internet is becoming more and more important in our life. How much do you know about it? What is the Internet? The Internet is a large, worldwide collection of computer networks. A network is a small group of computers put together. The Internet is many different networks from (A) the world. These networks are called the Internet. Once you have learned to use the Internet, you can have a lot of interest in the World Wide Web.
What is the World Wide Web?
The World Wide Web has been the most popular development of the Internet. The Web is like a big electronic book with millions of pages. These pages are called homepages. You can find information about almost anything in the world on these pages. For example, (B) you can use the Internet instead of a library to find information for your homework. You can also find information about your favourite sports or film stars, talk to your friends or even do some shopping on the Internet. Most pages have words, pictures and even sound or music.
What is e-mail? (C)电子邮件是给别人发送信息的一种方法。 It's much quicker and cheaper than sending a letter. If you want to send e-mails, you must have an e-mail address. This address must have letters and dots(点 ) and an ‘@'( meaning ‘at'). This is what an address looks like: Emily @ star. net. Write a message, type in the person's e-mail address, and then send the message on the Internet. People don't need to use stamps, envelopes or go to the post office since the invention of the Internet. Quick. easy and interesting--that's the Internet!
