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1.Agricultural societies cannot exist without staple crops.Several food plants,such as kola and okra,are known to have been domesticated in western Africa,but they are all supplemental,not staple,foods.All the recorded staple crops grown in western Africa were introduced from elsewhere,beginning, at some unknown date,with rice and yams.Therefore,discovering when rice and yams were introduced into western Africa would establish the earliest date at which agricultural societies could have risen there.which of the following is an assumption on which the argument depends?
A.People in western Africa did not develop staple crops that they stopped cultivating once rice and yams were introduced.
B.There are no plants native to western Africa that,if domesticated,could serve as staple food crops
答案选的是A，我选的是B。
2.Excavations of the Roman city of Sepphoris have uncovered numerous detailed mosaics depicting several readily identifiable animal species: a hare,a partridge,and various Mediterranean fish.Oddly,most of the species represented did not live in the Sepphoris region when these mosaics were created.Since indentical motifs apper in mosaics found in other Roman cities,however,the mosaics of Sepphoris were likely created by travelling artisans from some other part of the Roman Empire.which of the following is an assumption on which the argument depends?
C.No motifs appear in the Sepphoris mosaics that do not also appear in the mosaics of some other Roman city.
E.There was not a common repertory of mosaic designs whith which artisans who lived in various parts of the Roman Empire were familar.
答案选的是E,我选的是C。 |
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发表于 2013-7-8 11:51:45
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