单项选择题

A good title for this article would be ______.

A．The Cats Want to Sleep
B．I Can’t Sleep Tonight
C．How to Get Asleep
D．Some New Sleep Research
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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
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
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