Major depressive episodes happen to women earlier than men. Doctors assume that Seasonal Affective Disorder might occur when th

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问题 Major depressive episodes happen to women earlier than men.
Doctors assume that Seasonal Affective Disorder might occur when there is a higher degree of released ______.

选项

答案hormone meltonin

解析第1个小标题Types of Depression下Seasonal Affective Disorder(SAD)部分的第2句：Doctors aren’t sure exactly what physiological mechanisms are at work in SAD，but they speculate that depressed feelings and other symptoms may be due to an increase in the release of the hormone meltonin．空白处需要名词性成分。题目用when引导的时间状语从句来表达了原文因果关系的概念，题目中的a higher degree of released．．．与原文中的an increase in the release of...意思一致，故答案为原文of后不含定冠词the的名词成分。

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大学英语六级

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