Which of the following would be the best title for this passage

A．The Problem of Aging

B．Social Structures

C．Economic Technology

D．Continuing Education

光子射线的比释动能包括（）

A.碰撞比释动能和辐射牛比释动能

B.碰撞比释动能和爱减比释动能

C.辐射比释动能和衰减比释动能

D.衰减比释动能和质能吸收比释动能

E.空气比释动能和生物材料比释动能