用具有两对相对性状的两纯种豌豆作亲本杂交获得F1,F1自交得F2,F2中黄色圆粒、黄色皱粒、绿色圆粒、绿色皱粒的比例为9∶3∶3∶1,与F2出现这样的比例无直接关系的是
______ did you go to school yesterday? By bike. A. Where B. What C. How
______ did you go last weekend? I went to Beijing. A. Where B. What C. How
Sarah: I have a toothache. John: I’m _______ to hear that. A. glad B. tired C. sorry
Did you ________ your clothes on the weekend? A. wash B.washed C. washes
How tall are you, Liu Xiang ? A. I’m 74 kg. B. I wear size 43. C. I’m 188cm tall.