求解答！！！OG12的82和94的support逻辑题

zheshenzhang

82. 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 the 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.

为什么选D呢？这道题的结论没看懂，结论是this increase as the result of an area opening up as a new source of ivory吗？那么argue后的部分怎么理解呢？


94. Studies in restaurants show that the tips left by customers who pay their bill in cash tend to be larger when the bill is presented on a tray that bears a credit card logo. Consumer psychologists hypothesize that simply seeing a credit-card logo makes many credit card holders willing to spend more because it reminds them that their spending power exceeds the cash they have immediately available.
Which of the following, if true, most strongly supports the psychologists’ interpretation of the studies?
(A) The effect noted in the studies is not limited to patrons who have credit cards.
(B) Patrons who are under financial pressure from their credit-card obligations tend to tip less when presented with a restaurant bill on a tray with a credit-card logo than when the tray has no logo.
(C) In virtually all of the cases in the studies, the patrons who paid bills in cash did not possess credit cards.
(D) In general, restaurant patrons who pay their bills in cash leave larger tips than do those who pay by credit card.
(E) The percentage of restaurant bills paid with a given brand of credit card increases when that credit card’s logo is displayed on the tray with which the bill is presented.
这道题的结论是说 有credit-card logo的店，人们用卡付帐时愿意付更多小费 吗？那为什么不选E，而选B呢？
B说有logo付的小费更少，那不是削弱了吗？

望各位开导啊！！！谢谢！！！

ksdl

82D 选项表明在10century之前就有trade了，那么作者的argue必然就不能被支持了

ksdl

94的意思是logo提示人们自己的消费力，那么对于有负债的人来讲，看到Logo 付钱更少就说明了Logo的确有提示作用