B. test their ability
C. tell the world that they were intelligent
D. play a trick on operators of the computers
57.According to the passage, computer viruses seem to________.
A. have been in nature for years
B. exist in any computers
C. be difficult to get rid of at present
D. be able to be got rid of in the near future
58.The most serious damage caused by the viruses is that________.
A. the computers functions are lowered
B. the normal programs are damaged
C. all the information stored in the computers is gone
D. the computers infected by the viruses can no longer be used
59.According to the passage, which of the following is true?
A. Last year four countries found their computers were infected by 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 the viruses.
D. The Jerusalem Viruses are a great harm to human health.
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