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

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

单项选择题

According to the passage, electronic mail is a way to ______.

A．replace the old mail system
B．get electronics by mail
C．connect the users to the post office
D．communicate by personal computers or computer terminals