A:π6
B:π4
C:π3
D:π2
《齐民要术》有这样一段描述:“凡五果,花盛时遭霜,则无子。天雨新晴,北风寒彻,是夜必霜。然放火作煜,少得烟气,则免于霜矣。”,据此回答下列各题。
Ann wants a bike her birthday present this year.