题目

 ________ a mobile phone can you ring ______ you want to talk with anyway. A. Using; whoever         B. Only on; whomever   C. By; whatever           D. With; anyone 答案：B果蝇的白眼为伴X隐性遗传，显性性状为红眼。在下列哪组杂交后代中，通过眼色就可直接判断果蝇性别的是A．白眼雌果蝇×白眼雄果蝇B．杂合红眼雌果蝇×红眼雄果蝇C．白眼雌果蝇×红眼雄果蝇D．杂合红眼雌果蝇×白眼雄果蝇