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题库 / Prep2007E1-CR-63
Companies O and P each have the same number of employees who work the same number of hours per week. According to records maintained by each company, the employees of Company O had fewer job-related accidents last year than did the employees of Company P. Therefore, employees of Company O are less likely to have job-related accidents than are employees of Company P.
Which of the following, if true, would most weaken the conclusion?
The employees of Company P lost more time at work due to job-related accidents than did the employees of Company O.
Company P considered more types of accidents to be job-related than did Company O.
The employees of Company P were sick more often than were the employees of Company O.
Several employees of Company O each had more than one job-related accident.
The majority of job-related accidents at Company O involved a single machine.
因果/类比
∵O、P公司相同数量的职工工作相同时长，O职工的job-related accidents（JRA）小于P职工
∴O职工JRA的可能性小于P职工
削弱，即寻找O、P不同点，寻找他因（CQ1)，改变JRA可能性
A、P比O因为JRA浪费的工作时间更多，无关
B、P的JRA种类比O多，引入JRA种类他因，成功削弱，已经是这五个里最好的了，CORRECT（引入他因“JRA种类”）
C、P的职工比O更容易生病，增强
D、很多（不是全部）O职工，每个人都有超过一个的JRA（不知道P的情况，说不定更糟），无关
E、O中JRA常常与single machine有关，没有和P对比，也无关
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