gre考试阅读真题解析(A)_GRE阅读

gre考试阅读真题解析(A)

　　20. The research described in the passage is primarily concerned with answering which of the following questions?

　　 How can researchers control the effects that LSD has on behavior?

　　 How are animals reactions to LSD different from those of human beings?

　　 What triggers the effects that LSD has on human behavior?

　　 What technical advances would permit researchers to predict more accurately the effects of LSD on behavior?

　　 What relationship does the suppression of neuron activity have to the occurrence of serotonin syndrome?

　　21. Which of the following best defines serotonin syndrome as the term is used in the passage?

　　 The series of behaviors, usually associated with the administration of serotonin, that also occurs when LSD is administered to animals whose brains are depleted of serotonin

　　 The series of behaviors, usually associated with the administration of LSD, that also occurs when the amount of serotonin in the brain is reduced

　　 The maximal suppression of neuron activity that results from the destruction of serotonin-secreting neurons

　　 The release of stores of serotonin from serotonin-secreting neurons in the brain

　　 The proliferation of serotonin receptor sites that follows depletion of serotonin supplies in the brain

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