题目

根据提示选择合适的图片, 并完成对话。A. B. C. D. （1） — What does your sister look like?— She has big eyes. She long and straight hair. （2） — What does your new friend look like?— She thin. She long and curly hair. （3） — Is he tall or short?—He short. He big and round head. He doesn't have hair. （4） — Does he have curly or straight hair?— He a little straight hair. His face very long.下列各项实验中应采取的最佳交配方法分别是(　　) ①鉴别一只白兔是否为纯合子 ②鉴别一株小麦是否为纯合子 ③不断提高水稻品种的纯合度 ④鉴别一对相对性状的显隐性关系 A．杂交、测交、自交、测交                            B．测交、自交、自交、杂交 C．杂交、测交、自交、杂交                            D．测交、测交、杂交、自交