It has been made __________ public that anyone who does harm to the environment in         __________ public places will be blamed by __________ public.

A．the, the, the

B．/;the; the

C．/; /; the

D．the; /; the

煤气的热值是4.2×10⁷J/kg，完全燃烧2kg煤气能放出______J热量．