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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
Some researchers suspect that magnetic fields from high-voltage power lines can cause health problems for 【people who live especially near the lines ①近】.
However 然而, 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 ②远】.
文章出现两个对照组：【people who live especially near the lines ①近】 v.s. 【homes that are not located near such lines ②远】
问题：找前提P
选项里Whether：回答Yes→有效；回答no→无效。
选项A：控制另一个对照组control group（√），限定条件（包括时间、地点……）--秒选
Whether magnetic fields in 【homes that are not located near high-voltage power lines ②远】can cause health problems for the residents of those homes
A最开始觉得没关，但如果家里面的mag可以造成健康危害，那么near line的就有可能；如果家里的没有危害，near line就不会有危害-->这个是典型的evaluate
B人的believe没有关系
C urban or not，只要有人就不行
D Workplace跟urban一个概念
evaluate题，类比assumption题，结论句中提到的词组是重点关注对象
“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.）” 跟它对比的是不是也有健康问题？
换成assumption问题的话，那么这个人的假设就是没在附近的居民不会有健康问题
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
c:住在高压电线附近的人不可能由于电磁场产生健康问题
A选项否定：远离高压线的都不会产生健康问题，加强结论。
probably do not cause health problems beyond a few feet from the lines, because those magnetic fields are weaker than magnetic fields usually are in homes far from such fines.
是不够严谨，但只能选择最佳答案
本题是评估，不是加强。A项问的是房间内的磁场强度是否对人有伤害，如果没有伤害，那么肯定没问题。如果有伤害，需要进一步评估。所以很完美啊！
人们会在家里长时间停留，但是并不会在高压电线附近长时间待着，（待的时间越长，危害就越大）如果家里的较高强度的磁场对人们都没有危害的话，那么较低强度的，并且人们不常待的磁场影响就更小了。如果有影响的话，那么就需要另做评估了。登录 或 注册 后可以参加讨论
高压电导致－土地不结实－导致人们生病