单项选择题

The passage implies that research into the cause of human narcolepsy has been complicated by what aspect of the human brain（）

A.The tendency of certain neurons to resemble foreign matter that HLAs reject
B. A lack of apparent neurological damage caused by a tendency to remove debris through support cells
C.Its susceptibility to diseases like Parkinson's and Alzheimer's
D. Its tendency to reject the drugs which scientists have developed to treat narcolepsy's symptoms
E.The effects of aging on the symptoms of the disease

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单项选择题

SEAMY:

A．tricky
B．draconian
C．gaudy
D．serrated
E．decent

单项选择题

It may be inferred from the passage that by studying the brains of narcoleptic dogs, the author learned that（）

A. neural degeneration may occur too early for scientists to be able draw many useful conclusions about it
B. a loss of neurons would be undetectable unless the deadcellswere concentrated in a particular area of the brain
C. pathologists not only were researching the wrong stage of the disease process, but ignoring its unique effects on different species
D.the brain tends through its natural processing to remove the effects of neural degeneration
E. the theories of Aldrich and Mignot were largely correct, at least as far as dogs are concerned