Being interested in why we are here is not a “casual” interest like collecting stamps. People who ask such questions are taking part in a debate that has gone on as long as man has lived on this planet. How the universe, the earth, and life came into being is a bigger and more important question than who won the most gold medals in the last Olympics.

　　13. This text is most probably taken from __________.

　　A. a research paper

　　B. a course schedule

　　C. a personal letter

　　D. a book review

　　14. Which of the following best states the main idea of the passage?

　　A. Philosophical questions are as interesting as collecting stamps.

　　B. Thinking about philosophical questions is a serious interest.

　　C. Figuring out who we are and why we are here is man’s basic needs.

　　D. Philosophy has universal appeal and concerns everybody in nature.

　　15. The author believes that __________.

　　A. no existing subject can interest everyone in the world

　　B. different people may have different interests and concerns

　　C. everyone has to figure out who we are and why we are here

　　D. people in modern society pay more attention to philosophical questions

　　E

　　____16___ Life for these people is different from that for younger Americans. Most senior citizens retire, or no longer work full time. Also it is unusual for people of this age to live with their children and grandchildren. Grandparents tend to live in their own houses or apartments away from their families.

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