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
From this passage we can infer that ______.
A．college students always look down upon craftsmen
B．schools and books are not the only way to knowledge
C．scientific discoveries are based on personal experience
D．discoveries are the most important source of knowledge
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