Addressing the email message was invented in 1972 by Ray Tomlinson. He chose “@”from the keyboard for denoting(标明) sending messages from one computer to the other. Since then, using the Internet to send an email message has been simple. Other email features such as labeling(标记) and sorting email in folders for his boss for sorting his email; it was a big step forward. Later, John Vital developed a software in 1975 for organizing email.

　　It was difficult to connect to the Internet and make replies. Offline readers helped a lot to solve his problem. It allowed users to store their email on their personal computers, then read them and prepare replies without being connected to the network. This is similar to today’s Microsoft Outlook.

　　41. We know that the earliest email messages were _________.

　　A. not sent but left behind on a computer

　　B. sent among several computers

　　C. not easy to be seen by the computer user

　　D. often read by the user without being logged on

　　42. When the Internet was developed, the problem that people faced was how to _____.

　　A. receive email messages in time

　　B. send email messages to the right person

　　C. recognize other computers

　　D. talk to other computers

　　43. What helped to solve the problem of being difficult to connect to the Internet

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