题目

2.对某植物进行测交，得到的后代基因型为Rrbb和RrBb，则该植物的基因型为 A.RRBb B.RrBb C.rrbb D.Rrbb 答案：A() 20. —How did your interview with the manager go?一 He seemed interested in my experience,but he didn't ask for references (推荐信) .   A. Perfect! B. Tm not sure. C. That's right. D. Couldn’t be better.