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　　1970 was the “ Would Conservation Year ”．The United Nations wanted everyone to know that the world was in danger．They hoped that governments would act quickly in order to conserve(保护)nature．Here is one example of the problem．At one time there was 1300 different kinds of plants, trees and flowers in Holand , but now only 866 remain．The others have been destroyed by modern man and his technology．We are changing the earth．the air and the water, and everything that grows and lives here．We can’t live without these things．If things continue like this , we shall destroy ourselves．

　　What will happen in the future?Perhaps it is more important to ask , “What must we do now?” The people who will be living ing the world of tomorrow are the young of today．A lot of them know that conservation is necessary．Many are helping to save our world．They plant trees , build bridges across rivers in forests and so on．In a small town in the United States , a large group of girls cleaned the banks of 11 kilometes of their river．Young people may hear about conservation through a record called NO ONE’S GOING TO CHANGE OUR WORLD．It was made by the Beatles and other singers．The money from it will help to conserve animals．

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　　E-mail is one of the biggest threats(威胁)to your home computer．By understanding how E-mail works, and by taking some steps in how you deal with reading and writing messages, you can keep this threat out of your computer．When you exchange E-mail with someone else, the messages sent between you and that person pass through several computers before they reach their places．Imagine this conversation as it is taking place in an Internet“room”, a very, very big room．Anyone, or more exactly, any program can probably understand what is being said, because most Internet conversations are not hidden(隐藏)in any way．As a result, others may be listening in, capturing what you send, and using it for their own good．

　　E-mail-borne viruses(病毒)often arrive in attractive, fantastic appearances, much like the beautiful ads we receive by way of traditional mail that is made to sell us something．By beautiful appearances, an infected(感染)E-mail message seems to be something we want to read from someone we know, not a mean virus ready to destroy or damage our computers．

　　There are some steps that you can take to help you decide what to do with every E-mail message with an attachment(附件)that you receive．You should only read a message that passes all of these tests：

　　1)The Know Test：Is the E-mail from someone that you know?

　　2)The Received Test：Have you received E-mail from this sender before?

　　3)The Expect Test：Were you waiting for E-mail with an attachment from this sender?

　　4)The Meaning Test：Do the topic line of the E-mail massage and the name of the attachment both have meanings?

　　5)The Virus Test：Is the E-mail infected?

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