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题库 / Prep2007E1-CR-8
Automobile Dealer's Advertisement:
The Highway Traffic Safety Institute reports that the PZ 1000 has the fewest injuries per accident of any car in its class. This shows that the PZ 1000 is one of the safest cars available today.
Which of the following, if true, most seriously weakens the argument in the advertisement?
The Highway Traffic Safety Institute report listed many cars in other classes that had more injuries per accident than did the PZ 1000.
In recent years many more PZ 1000s have been sold than have any other kind of car in its class.
Cars in the class to which the PZ 1000 belongs are more likely to be involved in accidents than are other types of cars.
The difference between the number of injuries per accident for the PZ 1000 and that for other cars in its class is quite pronounced.
The Highway Traffic Safety Institute issues reports only once a year.
C说pz 1000属于的class比别的车容易出事
相当于小明说自己是班上成绩最好的人，所以小明是学校成绩最好的人，可是C选项说小明在的班比别的班差，自然可以weaken结论
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削弱，证明PZ的ZS/SG与安全的相关性不存在（CQ1）或者有其他因素比ZS/SG更能影响安全（CQ2）或者引入中间因素，是ZS/SG导致的因素影响了安全，而非ZS/SG本身（CQ3)
A. 其他车的ZS/SG大于PZ，比PZ危险，加强
B. PZ卖得好，与安不安全无关
C. PZ出的事故多（即SG多）（安全=ZS/SG*SG），即使用CQ2削弱因果联系，CORRECT
D. 事故数量区别被指明，与安全无关
E. 一年一次report 与安全无关
由此推出conclusion：PZ 1000是当今世界最安全的。
削弱：pz1000所在的种类的车 发生事故的可能性比其他种类的车更大
同系列的车的比较，和， 和其他系列车的比较，比较范围不一样
C：这个等级里的车谁都爱出事故，只是PZ100是这里面最不容易出事故的一个。
pronounced：noticeable 明显的
由此推出conclusion：PZ 1000是当今世界最安全的。
削弱：pz1000所在的种类的车 发生事故的可能性比其他种类的车更大
同系列的车的比较，和， 和其他系列车的比较，比较范围不一样
conclusion:别的class有更安全的车，pz1000不是最安全的车
c削弱
虽然在its class同类车最安全 但是its class最危险accidents最likey