题目

Last spring, members of Alaska’s Troop 34, based in Fairbanks, trudged (跋涉) out into the snowy wilderness to take part in their state’s Take a Kid Trapping program. In many parts of the state, beavers （海狸）are pests and need to be controlled. The 10－to－12－year－old girls found out where beavers lived, set traps, and skinned the two animals they caught. The girls hope to catch ten more beavers so that the entire troop can make mittens and hats with the fur. They also want to cook beaver meat. Troop leaders and members say the Scouts are doing a good deed by helping control在同一个圆中，半径和直径的比是________周长和直径的比是________．