题目内容：

    While most people feel lonely now and then, it usually only lasts between a few minutes and a few hours. 1. Psychologists are studying this complex phenomenon, and have identified three different types of loneliness.

The first kind of loneliness is temporary. 2. The second kind, situational loneliness, is a natural result of a particular situation—for example, a family problem, the death of a loved one, or moving to a new place. Although this kind of loneliness can cause physical problems, it usually does not last for more than a year. The third kind of loneliness is the most severe. 3. People who experience chronic(慢性的) loneliness have many problems socializing and becoming close to others. Unfortunately, many chronically lonely people think there is little or nothing they can do to improve their conditions.

4. We depend on various people for different reasons. For instance, our families give us emotional support, our parents and teachers give us guidance, and our friends share similar interests and activities. However, psychologists have found that the number of social contacts we have is not the only reason for loneliness. 5. In other words, though lonely people may have many social contacts, they sometimes fell they should have more. They question their own popularity.

A. However, this type of loneliness is not so serious.

B. For some people, though, loneliness can last for years.

C. Psychologists are exploring possible ways to solve the problem.

D. It usually disappears quickly and does not require any special attention.

E. It is more important how many social contacts we think or expect we should have.

F. Psychologists agree that one important factor in loneliness is a person’s social contacts.

G. Unlike the second type, habitual loneliness usually lasts more than two years and has no specific cause.