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题库 / Prep2012-CR-20
Public health official: Some researchers suspect that magnetic fields from high-voltage power lines can cause health problems for people who live especially near the lines. However, this is extremely unlikely: Beyond a distance of a few feet, the strength of the magnetic fields from high-voltage power lines is less than the average strength of magnetic fields in homes that are not located near such lines.
Which of the following would it be most useful to establish in order to evaluate the public health argument?
Whether magnetic fields in homes that are not located near high-voltage power lines can cause health problems for the residents of those homes
What proportion of people who live near high-voltage power fines believe that those fines may cause health problems
Whether high-voltage power lines are routed near residential in urban areas
What specific diseases or conditions are suspected by some researchers to result from exposure to magnetic fields from high-voltage power lines
What is the average strength of magnetic fields in workplaces that are not located near high-voltage power lines
因为在几个英尺内，高压电线的磁场强度低于不在这个范围的普通家庭的磁场强度。-> 高压线的磁场不太可能造成健康问题。问评价
choice a, 那种不在高压线附近的家庭内的磁场强度是否可以造成健康问题。correct
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