题目

—___________a large bowl of beef soup! You give me too much food today.—Don't you see ___________thin you are? You should eat more. A . What; how B . What; what C . How; what D . How; how 答案：A某植物种群AA基因型的个体占30%，Aa基因型的个体占50%，aa基因型的个体占20%，该种群的A和a基因频率分别是（    ） A．30%、20%      B．45%、55%      C．50%、50%    D．55%、45%