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Dear Marjorie,
Your husband just told me the wonde......

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The Work of Today Must Be Done Today You are to write in three parts. In the first part state what you think is the best way. In the second part, support your view with one or two reasons. In the last part, bring what you have written to a natural conclusion or summary. Marks will be awarded for content, organization, grammar and appropriacy. Failure to follow the instructions may result in a loss of marks.
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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