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题库 / GMATLA-CR-41
In Brindon County, virtually all of the fasteners-such as nuts, bolts, and screws-used by workshops and manufacturing firms have for several years been supplied by the Brindon Bolt Barn, a specialist wholesaler. In recent months many of Brindon County's workshops and manufacturing firms have closed down, and no new ones have opened. Therefore, the Brindon Bolt Barn will undoubtedly show a sharp decline in sales volume and revenue for this year as compared to last year.
The argument depends on assuming which of the following?
Last year the Brindon Bolt Barn's sales volume and revenue were significantly higher than they had been the previous year.
The workshops and manufacturing firms that have remained open have a smaller volume of work to do this year than they did last year.
Soon the Brindon Bolt Barn will no longer be the only significant supplier of fasteners to Brindon County's workshops.
The Brindon Bolt Barn's operating expenses have not increased this year.
The Brindon Bolt Barn is not a company that gets the great majority of its business from customers outside Brindon County.
如果Brindon Bolt Barn的收入都是来自Brindon County's workshops and manufacturing firms, 那Brindon Bolt Barn的收入会下降
E 取非，Brindon Bolt Barn还有海外业务，削弱
E
已知BB是B地区所有作坊的供应商，
逻辑链：
今年B地区很多作坊关闭了→BB今年销售额会暴跌
对选项B取非，就算开着的作坊销量不减，因为关掉的那些作坊BB销售也会跌
E说明BB的主要收入来源和客源是在B不是在其他地区。取非，如果不是在B，则B地区的影响对BB不大，削弱结论。
不能因为BB是B的唯一供应商就脑补BB主要收入是来自B。
A: revenue of last year vs. revenue of the year before last year. 不相关信息，无法给出今年的情况
B: remained opening shops have smaller work to do vs. last year 这个unstated info只能说它今年可能比去年赚的少，但不是sharply decline.
C: soon 可能会是今年，也可能是明年revenue才有反映出来，无关信息
D: BBB 的 cost不变，不能表示sales怎么样，可能会影响一点revenue，但是没什么关系在这
E: unstated info: BBB 除了这个国内市场，没啥其他外销市场---表明他没有其他revenue或者sales 的来源，那就是with p support C.
choice e, Barn并不是一家大多数生意来自于county之外的公司。correct，取非说明Barn大多数生意来自外面，削弱结论 （更优）
保险起见，要读完所有选项
choice b, 仍然开着的工作室和生产厂今年的工作量减少了。strengthen the conclusion，说明开着的那些店的Barn订单也因此减少了
choice c, 很快Barn就不再是唯一的fastener的供应商。irrelevant
choice e, Barn并不是一家大多数生意来自于county之外的公司。correct，取非说明Barn大多数生意来自外面，削弱结论
前提：BBB在BC的工厂很多都关闭了，也没有开新的
结论：BBB的销售和收入都会减少
果因推理的方向：因果关系，干扰因素
e选项取非削弱，BBB主要以BC外的客户为主，削弱结论。符合果因推理方向的干扰因素削弱