历年真题：GRE试题8

　　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.