单项选择题

Why was electronic mail unsuccessful in the past

A．Because its users subscribed to different, unconnected mail services.
B．Because people thought its services expensive.
C．Because people couldn't afford the personal computer.
D．Because computer networks used to disconnect globally.

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单项选择题

Why is electronic mail widely used in business

A．Because it can speed up the sending of messages.
B．Because it is a fashionable gadget to the businessman.
C．Because it is cheap and efficient.
D．Because it is a part of business life.

单项选择题

What does the word emanating in paragraph 5 mean

A．Coming forth
B．Flowing out of
C．Belonging to
D．Starting