On Oct. 12, 1989, some Chinese scientists were working at the computers to look for the information they needed. Suddenly they saw a lot of very bright spots crossing the computer’s screens. At the same moment the computers were working much slower. To find out what was happening, they stopped their work to check some parts of the computers. To their horror, they found out that most of their stored information was got rid of by computer viruses(病毒). Obviously all these computers had been infected(传染) by computer viruses.

　　It is said that the computer viruses were made by a group of young men fond of playing tricks. They all had excellent education. They created the viruses just to show their intelligence. This kind of computer viruses is named Jerusalem Viruses. These viruses can stay in computers for a long time. When the time comes they will attack the computers by lowering the functions, damaging normal programs or even getting rid of all the information.

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

　　1. The group of young men created the viruses to _______.

　　A. damage all the computers B. test their good ability

　　C. play tricks on operators of the computers D. attack foreign computer experts

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

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

　　A. the computer’s functions are lowered B. the normal programs are damaged

　　C. the computers infected by the viruses can no longer be used D. all the information stored in the computers is gone

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

　　A. Scientists have found a way to get rid of the viruses. B. The Jerusalem Viruses are a great harm to human’s health.

　　C. The viruses will come to a new computer after staying in the old one for some time.

　　D. On Oct. 12, 1989, some Chinese scientists found their computers were infected by viruses.

　　【答案与解析】计算机病毒不仅降低计算机的功能，而且还造成储存信息的丢失。

　　1. C。语义理解题。文章第2段第1句话It is said that the computer viruses were made by a group of young men fond of playing tricks. 把那群年轻人创造病毒的原因解释得非常清楚。

　　2. B。语义理解题。既然But till now, how to get rid of the terrible viruses remains a problem，那计算机病毒肯定很难清除。

　　3. D。语义理解题。读到第2段最后一句话中的…or even getting rid of all the information，答案不言自明。

　　4. D。判断题。读完全文就会发现A、B、C三项内容与文章内容不符，答案非D莫属。

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