单项选择题

In C language，a______is a series of characters enclosed in double quotes.

A．matrix
B．string
C．program
D．stream
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单项选择题
The line of computing jobs waiting to be run on a computer system might be a______.The jobs are serviced in the order of their arrival，that is，the first in is the first out.
A．queue
B．stack
C．array
D．record
单项选择题
The______in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America.
A．illness
B．virus
C．weakness
D．attachment
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