题目

某严格自花传粉植物种群中，亲代中AA基因型个体占30%，aa基因型个体占20%，则亲代A的基因频率和F1中AA的基因型频率分别是     A.55%和32.5%  B.55%和42.5%    C.45%和42.5%    D.45%和32.5%     答案：BThe books are very good, I like_______ very much.A.they B. their C. him D. Them