3. The passage discusses a way to deal with an offensive noise by
(A) diverting people's attention from it
(B) masking it with a louder noise
(C) canceling it out electronically
(D) removing its source
4. One of the functions of the microprocessor described in the passage is to
(A) produce musical sounds
(B) monitor sound patterns
(C) record different kinds of noise
(D) increase the volume of leftover sounds
5. The microprocessor described in the passage will probably be used for
(A) composing music
(B) repairing alarm systems
(C) eliminating engine noises
(D) intensifying for warning sounds
6. The researcher mentioned in the passage are concerned about unwanted noise because it can
(A) cause deafness
(B) create hazardous working conditions
(C) influence ocean waves
(D) damage loudspeakers and sound equipment
7. According to the passage, what group of people will probably first from the use of the microprocessor?
(A) Ship's crews
(B) Research engineers
(C) People with insomnia
(D) Engine repair teams
8. A paragraph following the passage would most probably discuss
(A) the nature of fog
(B) a way to improve alarm systems
(C) other causes of fatigue
(D) other uses for the microprocessor