GRE考试

【单选题】The passage supplies information to answer which of the following questions
A、Which species, human or dog, has greater numbers of the neurotransmitters that have been hypothetically linked to narcolepsy
B、At what age do human beings first experience the degenerative effects of narcolepsy
C、What role do human leukocyte antigens perform for the human immune system
D、Why did Honda initially suspect that HLAs played a role in narcolepsy
E、Which of the researchers named in the passage isolated narcolepsy as a distinct syndrome
网考网参考答案：C
网考网解析：
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