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 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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