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.

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单项选择题

In Para. 4, Line 2, telephone tag is ______.

A．an ability to communicate with people with ease
B．getting the wrong person on the telephone
C．an inablity to find time to telephone the person
D．an inability to contact the person you phone

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.