单项选择题

Internet, a ________ of millions of computers linked world wide, is the largest system serving e - mail messengers.

A．unity
B．connection
C．network
D．combination
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单项选择题
As electric lines were destroyed by the storm, they were forced to ________ light for several days.
A．go over
B．go in for
C．go without
D．go out
单项选择题
The textbook question as well as other issues is going to be discussed when the congress is in ________ again next spring.
A．assembly
B．convention
C．conference
D．session
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