Speaker A: I’’m seventy-eight, but I never stop jogging every evening. Speaker B: You’’re seventy-eight No kidding.______

A．parents should be strict with their children
B．parental controls reflect only the needs of the parents and the values of the community
C．parental restrictions vary, and are not always enforced for the benefit of the children alone
D．parents vary in their strictness towards their children according to the situation

A．mobile phones are very fashionable with teenagers
B．they can call home if they are in trouble and need help
C．they can use mobiles to play simple computer games
D．mobile phones enable teenagers to give up smoking