For similar cars and drivers, automobile insurance for collision damage has always cost more in Greatport than in Fairmont. Police studies, however, show that cars owned by Greatport residents are, on average, slightly less likely to be involved in a collision than cars in Fairmont. Clearly, therefore, insurance companies are making a greater profit on collision-damage insurance in Greatport than in Fairmont.
Which of the following is an assumption on which the argument depends?
此题要找假设, 先看结论.结论说的是insurance companies are making a greater profit on collision-damage insurance in Greatport than in Fairmont.所以应该再找两者之间的差异.即假设必须维持此假设.最后用取非检验 A