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 article is about a couple whose married life is happier because _______.
A．they have a truly equal partnership
B．the husband enjoys staying at home
C．they earn more money
D．the wife has a full-time job
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