2. 外语
  3. Major depressive episodes happen to women earlier than men. Some middle-aged people tend to suffer from Biochemical depression

Major depressive episodes happen to women earlier than men. Some middle-aged people tend to suffer from Biochemical depression

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问题 Major depressive episodes happen to women earlier than men.
Some middle-aged people tend to suffer from Biochemical depression which might result from ______ within the brain.
选项
答案biochemical problems
解析 第1个小标题Types of Depression下Biochemical depression部分的第l、2句：Doctors aren’t sure why， but some people develop a biochemically based depression sometime during midlife．It’s likely that this type of depression is caused by biochemical problems within the brain.空白处需要名词性成分。原文第2句的this type of depression指的是第1句中提到的人到中年因为生理原因而患上的抑郁症。题目中的result from和原文的is caused by均表示因果关系，而且都是先果后因，题目要求填入病因，故答案在by之后。
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大学英语六级

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