单项选择题

In the passage, the author is primarily concerned with（）

A．presenting a hypothesis and describing compelling evidence in support of it
B．raising a question and describing an important discovery that led to an answer
C．showing that a certain autoimmune disease cannot yet be treated effectively with drugs
D．explaining what evidence exists for an autoimmune cause for narcolepsy
E．discussing the importance of research on animals for the study of human disease

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单项选择题

Which of the following, if true, would most likely weaken the significance of Mignot and Aldrich's research（）

A．The numbers of neurotransmitters and receptor levels differs widely between dog brains and human brains.
B．Alterations in neurotransmitter and receptor levels might be the result of sleep disturbances, not the cause of it.
C．A particular site in the brain's frontal lobe is isolated where the bulk of the neurological damage occurs.
D．Too few acetylcholine, dopamine and norepinephrine neurotransmitters exist in dog brains to establish their role in narcolepsy.
E．An autoimmune dysfunction is conclusively proven to be the cause in a large but incomplete majority of narcolepsy cases.

单项选择题

The development of a thoroughly effective treatment for narcolepsy is regarded by the author as（）

A．possible, but not very important
B．interesting, but too costly to be practical
C．promising, but many years off
D．extremely unlikely
E．highly probable