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  3. Placing a human being behind the wheel of an automobile often has the same curios effect as cutting certain fibres in the brain.

Placing a human being behind the wheel of an automobile often has the same curios effect as cutting certain fibres in the brain.

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问题     Placing a human being behind the wheel of an automobile often has the same curios effect as cutting certain fibres in the brain.
    The result in either case is more primitive behaviour. Hostile feelings are apt to be expressed in an aggressive way.
    The same man who will step aside for a stranger at a doorway will, when behind the wheel, risk an accident trying to beat another motorist through an intersection. The importance of emotional factors in automobile accidents is gaining recognition. Doctors and other scientists have concluded that the highway death toll resembles a disease epidemic and should be investigated as such.
    Dr. Ross A. McFarland, an associate professor of industrial Hygiene at the Harvard U-niversity School of Public Health, aid that accidents "now constitute a greater threat to the safety of large segments of the population than diseases do. "
    Accidents are the leading cause of death between the ages of 1 and 35. About one third of all accidental deaths and one seventh of all accidental injuries are caused by motor vehicles.
    Based on the present rate of vehicle registration, unless the accident rate is cut in half, one of every 10 persons in the country will be killed or injured in a traffic accident in the next 15 years.
    Research to find the underlying causes of accidents and to develop ways to detect drivers who are apt to cause them is being conducted at universities and medical centres. Here are some of their findings so far：
    A man drives as he lives. If he is often in trouble with collection agencies, the courts, and police, chances are he will have repeated automobile accidents. Accident repeaters usually are egocentric, exhibitionistic, resentful of authority, impulsive, and lacking in social responsibility. As a group, they can be classified as borderline psychopathic personalities, according to Dr. McFarland.
    The suspicion, however, that accident repeaters could be detected in advance by screening out persons with more hostile impulses is false. A study at the University of Colorado showed that there were just as many overly hostile persons among those who had no accidents as among those with repeated accidents.
    Psychologists currently are studying Denver high school pupils to test the validity of this concept. They are making psychological evaluations of the pupils to see whether subsequent driving records will bear out their thesis.
The tone of this passage is______.
选项 A、ironical
B、pessimistic
C、humorous
D、objective
答案D
解析 作者在文章中引用了较多研究员的研究结果，以事实为依据，分析讨论交通事故率高的原因。在讨论中，作者没有用那些很强的带有个人感情色彩的词语，而是以一种比较客观的态度来讨论问题。所以正确答案应为D。
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