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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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
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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