题目

______ as the “First Lady of Speech”, Dr Lillian Glass is recognized as one of the world’s leading experts on communication skills.    A. Knowing                B. Having known       C. Known                 D. To be known 答案：C 解析: know 与Dr Lillian Glass存在被动关系，应用过去分词。故选C。某植物的花色遗传由两对等位基因控制，相关基因用A、a和B、b表示。现有两个纯合的紫花品种杂交，F1开红花，F1自交，F2的性状分离比为红花：紫花：白花=9:6:1。下列分析中不正确的是A.F1中红花植株的基因型是AaBbB.对F1进行测交，后代性状分离比为紫花：红花=1:1C.F2中紫花植株的基因型有4种D.F2红花植株中纯合子所占比例为1/9