Doctors have known for a long time that extremely loud noises can cause hearingdamage or loss. The noise can be the sound of a jet airplane or machines in factoriesof loud music or other common sound at home and at work. A person only needs tohear the noise for little more than one second to be affected.
An American scientist has found that using aspirin(阿斯匹林) increase thetemporary(暂时的)hearing loss or damage from loud noise. He did an experimentusing a number of students at a university who all had normal hearing. He gave themdifferent amounts of aspirin for different periods of time,then he tested their hearingability. He found that students who were given four grams of aspirin a day for twodays suffered much greater temporary hearing loss than those who did not use aspirin.The hearing loss was about two times as great.
The scientist said millions of persons in the U.S. use much larger amounts ofaspirin than were used in his experiment. He said these persons face a serious dangerof suffering hearing loss from loud noise.
71. Doctors have long known that .
A.one may lose his hearing when he hears a terribly loud noise.
B.one may become deaf when he hears a loud noise
C.loud noises can cause damage to the hearing of the young people only
D.common sounds at home are not harmful to the ear
72. The passage suggests that one's hearing .
A.will be damaged even if he has heard a loud noise for only little more than onesecond
B.will be damaged even if he has heard a loud noise less than one second
C.will not be damaged if he has heard a loud noise for only little more than onesecond
D.will not be damaged if he has little more than one second to get ready
73. One conclusion you can draw from the passage is that aspirin .
A.makes hearing damage from loud noise worse
B.should never be taken more than four grams
C.can damage one's hearing when it is given more than four grams daily
D.always increases hearing loss by two times
74. Millions of Americans are in danger of suffering hearing loss becausethey .
A.take too much aspirin
B.often take air trips
C.like listening to loud music
D.have too much loud noises at home and work
75. The American scientist did his experiment in order to find .
A. how much aspirin would affect a person’s hearing
B.how much aspirin should be given in the treatment of the patients with hearingdamage from loud noise
C. whether aspirin would increase the temporary hearing damage from loud noises
D.whether the people who had hearing damage should use aspirin