单项选择题

More and more people will so on appreciate v-mail service probably because ______.

A．it is very efficient
B．it brings a lot of fun
C．it is very cheap
D．it attracts young people
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单项选择题
The author compared the supermarket manager to ______.
A．a military leader.
B．a school inspector
C．traffic supervisor
D．an orchestra conductor
单项选择题
It seems as if many Internet companies such as AT&T WorldNet and Yahoo ______.
A．have jumped on some kinds of cars or trucks
B．have begun their v-mail business operations
C．have started to demonstrate to the public
D．have begun their musical performance
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