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ught bravely against the Goths but was defeated，and disappeared mysteriously .Ri>
　　Transfer interrupted！
　　Riothamus，match almost exactly those attributed to King Arthur.Therefore，Riothamus must be thehistorical model for the legendary King Arthur.
　　The argument above requires at least one additional premise.Which of the following could be such a required premise？
　　（A）Modern historians have documented the activities of Riothamus better than those of any other fifth-century king.
　　（B）The stories told about King Arthur are not strictly fictitious but are based on a historical person and historical events.
　　（C）Riothamus' associates were the authors of the original legends about King Arthur.
　　（D）Legents about the fifth century usually embellish and romanticize the actual conditions of the livesof fifth- century nobility.
　　（E）Posterity usually remembers legends better than it remembers the actual historical events on which they are based.
　　10.A worldwide banon the production of certain ozone-destroying chemicals would provide only an illusion of protection.Quantities of such chemicals，already produced，exist as coolants in millions of refrigerators.When they reach the ozone layer in the atmosphere，their action cannot be halted.So there is no way to prevent these chemicals from damaging the ozonelayer further.
　　Which of the following， if true，most seriously weakens the argument above？
　　（A）It is impossible to measure with accuracy the quantity of ozone-destroying chemicals that exist as coolants in refrigerators.
　　（B）In modern societies，refrigeration of food is necessary to prevent unhealthy and potentially life-threatening conditions.
　　（C）Replacement chemicals that will not destroy ozone have not yet been developed and would be more expensive than the chemicals now used as coolants in refrigerators.
　　（D）Even if people should give up the use of refrigeration，the coolants already in existing refrigerators are a threat to atmospheric ozone.
　　（E）The coolants in refrigerator can be fully recovered at the end of the useful life of the refrigerators and reused.
　　Question 11——15
　　A government is assigning each of six embassy office workers ——Farr，Golden，Hayakawa， Inserra，Jones，and Kovacs——to embassies.There are four embassies.Embassies L and M are located in countries with dry climates，whereas embassiesP and T are located in countries with humid climates.The office workers must be assigned according to the following rules：
　　Each embassy must have at least one of the workers assigned to it.
　　At least one embassy in a humid climate must haveat least two workers assigned to it.Golden cannot be assigned to the same embassy as Kovacs.
　　Inserra must be assigned t an embassy in a dry climates.
　　Jones must be assigned to an embassy in a humid climate.
　　11.Which of the followingis an acceptable assignment of the workers to the embassies？
　　L M P T
　　（A）Farr，Golden Inserra，Kovacs Hayakawa Jones
　　（B）Golden，Kovacs Inserra Jones Farr，Hayakawa
　　（C）Golden Farr，Inserra Kovacs Jones，Hayakawa
　　（D）Jones Golden， Inserra Hayakawa Farr，Kovacs
　　（E）Kovacs Farr，Hayakawa Inserra Golden，Jones
　　12.Which of the following must be assigned either to embassy L or to embassy M？
　　（A）Farr
　　（B）Golden
　　（C）Hayakawa
　　（D）Inserra
　　（E）Kovacs
　　13.Which of the following CANNOT be true？
　　（A）One worker is assigned to L.
　　（B）Two workers is assigned to P.