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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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 is very cheap
C．it brings a lot of fun
D．it attracts young people
单项选择题
From the last sentence of this passage, we come to know that ______.
A．technology has not prepared itself for the development of v-mail
B．technology is not advanced enough for the development of v-mail
C．advertisers will not show much interest in v-mail business for a while
D．advertisers will show little interest in v-mail business for quite long
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