Paragraph 4______A. The old people are heavy load

Paragraph 4______

A. The old people are heavy load for the society.

B. Prolonging human life may lead to population explosion.

C. How to prolong human life.

D. Dependency load caused by prolonging human life.

E. Increased birthrate helps prolong human life.

F. How the old people are cared for when they are getting weak in contemporary society.