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The Work of Today Must Be Done Today......

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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
His book has made a great impact _______ its readers.
A．at
B．for
C．to
D．on
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