We now come to know that Jerusalem Viruses often attack computers on Fridays and that they are spreading(传播) to a list of computers. Among the countries that suffering computer viruses are Britain, Australia, Switzerland and the U.S. But till now, how to get rid of the terrible remains a problem.

　　67. The group of young men created the viruses to __________.

　　A. damage the computers

　　B. test their ability

　　C. play a trick on operators of the computers

　　D. tell the world that they were intelligent

　　68. According to the passage, computer viruses seem to _______.

　　A. have been in nature for years

　　B. be difficult to get rid of at present

　　C. exist（存在） in any computers

　　D. be able to be got rid of in the near future

　　69. The most serious damage caused by the viruses is that _______.

　　A. all the information stored in the computers is gone

　　B. the computer’s functions are lowered

　　C. the normal programs are damaged

　　D. the computers infected by the viruses can no longer be used

　　70. According to the passage, which of the following is true?

　　A. 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

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