Questions 21-25 are based on following passage: Many people start relationships because of loneliness. Loneliness and being alone are not synonymous . loneliness is a state of painful isolation,of feeling cut off from friends and family. Being alone, a state of solitude(独处), can be quite desirable most of the time, since it allows us to work, study, live, or reflect on the world around us. Solitude is usually a matter of choice; loneliness is not. Lonely people tend to spend a lot of time by themselves, eat dinner alone, spend weekends alone, and participate in few if any social activities. They are unlikely to date. Some lonely people report having many friends,but a closer look suggests that these “friendships” are shallow. Lonely people are unlikely to share confidences. Loneliness tends to peak during adolescence(青春期). This is when most young people begin to replace family ties with peer relationships. Loneliness is quite often connected with feelings of depression and with a feeling of being “sick at heart”. Loneliness is even reported among some married people. In one of the recent studies, lonely wives tended to feel less liking and love for their partners and expressed less satisfaction with their married life. Lonely husbands reported less liking for their wives and less intimacy in their relationships. Whichof the following is discussed in Paragraph 2 A: How lonely people usually behave. B: what lonely people want in general. C: why lonely people often feel depressed. D: How loneliness usually gets started.