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

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热门试题

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.

单项选择题

Internet provides ______.

A．consumers with international business opportunities
B．subscribers with a cheap and efficient link
C．formal roles to oversee its users
D．telecommunications services to users