A-A+
The language used in this article indicates th
问题详情
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请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：D
解析：A项说Dr.Koella很确定serotonin能控制睡眠，这一点文中已表明是不肯定的；但B项说他十分不确定，也不能这么说；而C项说serotonin不能被提取，实验证明是可以提取的；所以应选D项，Dr．Koella认为，serotonin可能可以控制睡眠。
