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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.
If the statements on which the conclusion above is based are all true, each of the following could 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 schizophrenics share many of the characteristics found in those of people without the disorder (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 someone 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 | 
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发表于 2007-4-5 17:22:00
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