题目

The kids were hard to （settlement） down since they were so excited in the evening party. 答案：【1】settle在一个种群随机抽出一定数量的个体，其中基因型AA的个体占24%，基因型Aa的个体占72%，则基因A和a的频率分别是（  ） A .24%，72%     B. 36%，64%      C .57%，43%     D. 60%，40%