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
We can infer from the passage that a change-over of roles in the family ______.
A．is quite necessary in modem life
B．is probably based on some practical reasons
C．aims solely at a complete emancipation of women
D．shows women are not necessarily inferior to men
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