单项选择题

According to the passage, computer viruses seem to ______.

A．have been in nature for years
B．be difficult to get rid of at the present
C．be found in any computer
D．be able to get rid of in the near future
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单项选择题
The group of young men created the viruses to ______.
A．damage all the computers
B．test their good ability
C．tell the world they were intelligent
D．laugh at the operators of the computer
单项选择题
According to the passage, which of the following is true
A．In 1988, four countries found their computers were infected by the viruses.
B．The viruses will come to a new computer after staying in the old one for some time.
C．Scientists are trying to find a way to get rid of viruses.
D．The Jerusalem Viruses are great harm to human's health.
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