单项选择题

The information in paragraph 5 indicates that PCPA was responsible for ______.

A．a lack of sleep
B．the cats' meowing
C．normal sleeping patterns
D．sleeping about 15 hours a day
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单项选择题
The brain stem is located (Paragraph 2) ______.
A．in the hypothalamus
B．between the brain and the spinal cord
C．in the transmitter nerve cells
D．between the hypothalamus and the brain
单项选择题
The language used in this article indicates that Dr. Koella ______.
A．is positive that serotonin controls sleep
B．is quite uncertain whether serotonin controls sleep
C．thinks that serotonin can't be extracted
D．thinks that serotonin might control sleep
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