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请高手解释39真题CR-9 and 13
9. In the year following an eight-cent increase in the federal tax on a pack of cigarettes, sales of cigarettes fell ten percent. In contrast, in the year prior to the tax increase, sales had fallen one percent. The volume of cigarette sales is therefore strongly related to the after-tax price of a pack of cigarettes.
The argument above requires which of following assumptions?
A. During the year following the tax increase, the pretax price of a pack of cigarettes did not increase by as much as it had during the year prior to the tax increase.
B. The one percent fall in cigarette sales in the year prior to tax increase was due to a smaller tax increase.
C. The pretax price of a pack of cigarettes gradually decreased throughout the year before and the year after the tax increase.
D. For the year following the tax increase, the pretax price of a pack of cigarettes was not eight or more cents lower than it had been the previous year.
E. As the after-tax price of a pack of cigarettes rises, the pretax price also rises.
我的答案是B，因为原文结论的得出是根据“In the year following an eight-cent increase in the federal tax on a pack of cigarettes, sales of cigarettes fell ten percent. In contrast, in the year prior to the tax increase, sales had fallen one percent. ”2个事实得到的，而第二个事实只有结果没有原因，则B答案作为假设提供第二个事实的原因，才可得出结论
13. A sudden increase in the production of elephant ivory artifacts on the Mediterranean coast of North Africa occurred in the tenth century. Historians explain this increase as the result of an area opening up as a new source of ivory and argue on this basis that the important medieval trade between North Africa and East Africa began at this period.
Each of following, if true, provides some support for the historians’ account described above EXCEPT:
A. In East Africa gold coins from Mediterranean North Africa have been found at a tenth-century site but at no earlier sites.
B. The many surviving letters of pre-tenth-century North African merchants include no mention of business transactions involving East Africa.
C. Excavations in East Africa reveal a tenth-century change in architectural style to reflect North African patterns.
D. Documents from Mediterranean Europe and North Africa that date back earlier than the tenth century show knowledge of East African animals.
E. East African carvings in a style characteristic of the tenth century depict seagoing vessels very different from those used by local sailors but of a type common in the Mediterranean
我认为此题的答案B不能支持原文，因为如果“the important medieval trade between North Africa and East Africa began at this period. ”，则不可能在“The many surviving letters of pre-tenth-century North African merchants include no mention of business transactions involving East Africa”
而D恰恰支持了原文，因为正是由于that date back earlier than the tenth century show knowledge of East African animals，才可能 在 the tenth century出现 important medieval trade between North Africa and East Africa。从了解到大规模贸易的出现应该是有时间差的
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发表于 2003-10-23 19:50:00
