阅读理解。
On October 12, 1987, some Chinese scientists were working at the computers to look for
information they needed. Suddenly they saw a lot of very bright spots (点) crossing the
computers' screens. At the same time 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 (恐惧), they found out that most of their stored information was got rid of (除掉)
by computer viruses! Obviously all these computers had been infected (感染) by computer
viruses.
It is said that the computer viruses were made by a group of young man fond of playing
tricks. They all had excellent education. They created the viruses just to show their
intelligence. (才智) These kinds of computer viruses are named Jerusalem (耶路撒冷)
Viruses. These viruses can stay in computers for a long time. When the time comes they
will attack the computers by lowering the function (功能), damaging their 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 (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.
1. The group of young men created the viruses to ______. [ ]
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
2. According to the passage, computer viruses seem to ______.[ ]
A. have been in nature for years
B. exist (存在) in any computers
C. be difficult to get rid of at present
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. all the information stored in the computers is gone
D. the computers infected by the viruses can no longer be used
4. 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.
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.
