[单项选择]The cold is bad enough, but winter’s shorter days make the season a downer, to say the least. But how real is seasonal affective disorder (known as SAD)
SAD is often a catch-all term to describe the winter dumps, but experts say it’s often misused and the condition is actually less common than people think. "There are a lot of myths. SAD is not a myth. It is a mental disorder that is incompletely understood and also something that is complicated by questions about the role of evolutionary biology," says Dr. Jeffrey Lieberman, the president of the American Psychiatric Association.
That diagnosis is different from the lows that many feel during the winter months. In fact, research shows many people overestimate the impact of seasons on their moods in general.
Where is the line between SAD and the simple doldrums How much winter sadness is the product of a mood-based disorder, and how much is a natural outcome of being cooped up indoors SAD is considered a subtype of a mood
A. common condition among people
B. term referring to the winter dumps
C. term not being totally understood
D. term of evolutionary biology