Fast forward the present day and most of us have at least a personal web­based email account.It seems impossible to live without them.One of the biggest advantages of email is the fact that communication has become so much easier，especially with those across different time zones.Email takes seconds to send a message whereas letters，as we used to communicate by，could take weeks.Of course there was the fax，that beeping invention from the 1980s，but it wasn't as secure as email and you never knew if the person on the other end had picked up your fax or if it had got lost somewhere in the office.

　　In conclusion，one of the best inventions from the 1990s has to be email.But sometimes people are too closely connected to their email and have a compulsion to check it several times a day.At work，people have become lazy and instead of going to speak to the person sitting next to them，they send an email，causing an in box to pile up with more time spent reading email and responding rather than working.Clearly，an invention that saved time because of its quick and speedy connection can now also cause us to waste a lot of time.

　　21．The earliest email came into being probably________.

　　A．in 1991

　　B．in 1996

　　C．in 1997

　　D．in 2007

　　22．Which of the following may be the main idea of the second paragraph?

　　A．The development of Microsoft.

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