7. On turning 65 years old, everyone living in the town of Malton becomes eligible to receive a card that guarantees discounts on most goods and services sold in the town. Census records for 1990 show that 2, 450 inhabitants of Malton turned 64 in that year. Yet . in 1991 over 3,000 people applied for and properly received discount cards. So clearly some of Malton's population growth between 1990 and 1992 must be attributable to migration into the city by people in their mid -60's
Which of the following is an assumption on which the argument depends?
(A) The town of Malton has no complete census records for 1991.
(B) The overall size of the population of Malton grew by over 500 during 1990.
(C) Fewer people applied for and received discount cards in 1991 than did so in 1992.
(D) Among the people 65 years old or older who moved into Malton in 1991. there was no one who did not apply for a discount card .
(E) In general. people who applied for and received discount cards in 1991 first became eligible to do so in that year
我就是没想通为什么D要完备些呢？
我觉得there was no one who did not apply for a discount card.这个不是必要的条件，不是assumption。比如移民过来的人里有600个mid-60的，其中只有550个申请了discount card，这样就没有满足there was no one who did not apply for a discount card这个条件，但是依然可以得出文中的结论。
我的理解如下：
因为文章中有明确说“So clearly some of Malton's population growth between 1990 and 1992 must be attributable to migration into the city by people in their mid -60's”，这是作者得出的结论，题目问的是，这个结论是基于什么假设得到的。E虽然也是一种假设，但并不是作者基于该假设而得到了结论。如果每个人都在有资格申请的第一年申请了打折卡，那并不能说明导致前述矛盾的原因是90~92年的移民，因为移民并不一定是65岁。也就是说，可能他们都是70岁来的，这样E就不成立了。
而D，因为有了移民都申请了打折卡的假设，才能推出之前描述的矛盾是移民导致的。
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发表于 2013-5-7 15:31:52
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