[音频]27.A. People tend to go to extremes in daily life.B. People try all out to build a perfect relationship.C. People change themselves easily in marriage.D. People feel comfortable with common partners.

A. Responsibility and intelligence.
B. Tolerance and adaptation.
Cheerfulness and surprise.
D. Willingness and expectation.

A. 文化因素
B. 资源分配
C. 经济因素
D. 上层建筑

A. 年轻型-静止型
B. 成年型-增长型
C. 年老型-缩减型
D. 年轻型-缩减型

A. 健康的生活方式因素
B. 自然环境因素
C. 生物学因素
D. 经济和社会因素