A．ice would soon cover*the northern hemisphere
B．the greenhouse effect could work to the advantage of the earth
C．the best way to overcome the cooling effect would be to burn more fuels
D．the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly

A．things in public schools are not so bad as has often been said
B．their tolerance of public education will attract more kids to public schools
C．home schooling is superior and, therefore, they will not easily give in
D．their increased cooperation with public school will bring about the improvement of public education