Questions 23 – 24 The brains of identical twins are genetically identical. When only one of a pair of identical twins is a schizophrenic, certain areas of the affected twin’s brain are smaller than corresponding areas in the brain of the unaffected twin. No such differences are found when neither twin is schizophrenic. Therefore, this discovery provides definitive evidence that schizophrenia is caused by damage to the physical structure of the brain. 23. Which one of the following is an assumption required by the argument? (A) The brain of person suffering from schizophrenia is smaller than the brain of anyone not suffering from schizophrenia (B) The relative smallness of certain parts of the brains of schizophrenics is not the result of schizophrenia or of medications used in its treatment. (C) The brain of a person with an identical twines no smaller, on average, than the brain of person who is not twines. (D) When a pair of identical twins both suffer from schizophrenia, their brains are the same size (E) People who have an identical twin are no more likely to suffer from schizophrenia than those who do not. the answer is B,why? 24. If the statements on which the conclusion above is based are all true, each of the following cold be true EXCEPT: (A) People who lack a genetic susceptibility for the disease will not develop schizophrenia (B) Medications can control most of the symptoms of schizophrenia inmost patients but will never be able to cure it. (C) The brains of schizophrenics share many of the characteristics found in those of people without the disorder. (D) It will eventually be possible to determine whether or not some one will develop schizophrenia on the basis of genetic information alone (E) Brain abnormalities associated with schizophrenia are the result of childhood viral infections that inhibit the development of brain cells. a is also wrong? 没有遗传方面问题的人不会的这种病，这种病本来就和遗传没关系，是后天的损害造成的。 谢谢
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发表于 2004-9-6 05:25:00
