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
Operators of computers should give instructions to work in the form. of program______.
A.which are introduced to turn into computers
B.through which computers could process "language"
C.which could tell computers what to do and how to do it
D.all of the above
Microminiaturization of future computers will be realized through the use of ______.
A.superconductivity B.molecules
C.DNAs D.smaller chips
Which of the following computers is the smallest according to the text?
A.a palmtop B.A desktop
C.A minicomputer D.A laptop
Learning to use computers is what we want to ______ from the program.
A.help
B.make
C.aid
D.benefit
In ______ century, computers will be used more widely.
A.twenty-one
B.the twenty-one
C.twenty-fast
D.the twenty-first
2.How many types of regular computers are introduced in this text?
A.1 B.2
C.3 D.4
8.Future computers will be made very fast by employing ______.
A.superconductivity B.smaller chips
C.more elements D.networks