A. damage the computers

　　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 computer’s 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.

　　B

　　Baths and bathing have long been considered of medical importance to man. In Greece there are the ruins of a bathtub and water system built over 3, 000 years ago. The Romans had warm public baths. In some as many as 3, 000 persons could bathe at the same time.

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