When a person feels low, blue, or down in the clumps, it usually means he has been hurt, disappointed, or saddened by something that causes a confused and listless feeling. There is 11 a type of music called "the blue", a low, mournful, sad sound to 12 these universal human feelings.

　　Depression is another name for this mood. Feeling depressed is a normal and natural 13 to experiences of loss, failure, and undeserved bad luck. Indeed, it has been pointed out that without depression, we would 14 much of the world's great tragic literature, music, and art.

　　In some cases, however, depression becomes something more than just 15 feelings of blues or letdown. A large number of people suffer from what psychiatrists call "depressive illness. " Depressive illness is more 16 and lasts longer than common listless feelings. Sometimes a serious 17 of depression can begin with the loss of a loved one or a change of job. Many times, in very

　　18 cases, there doesn't seem to be any circumstance serious enough to have caused the depression.

　　Some psychiatrists suggest that the key feature in depression is change. The person becomes different from the way before the onset of his depression. He may even become the opposite of his usual self. There are many examples: the businessman who becomes a wanderer, the mother who wants to 19 her children and herself. Instead of seeking satisfaction and pleasure, the depressed person 20 it.

　　参考答案：

　　11. A 12. F 13. O 14. G 15. K 16. C 17. N 18. E 19. D 20.M