研究表明:一对黑色家鼠与白化家鼠杂交,F1均为黑色家鼠,F1中黑色家鼠个体自由交配,F2出现黑色家鼠:浅黄色家鼠:白化家鼠=9:3:4,则F2中浅黄色个体中能稳定遗传的个体比例为( ) A.1/16 B.3/16 C.1/3 D.1/4 答案:C27、— What disappointment to see
Liu Xiang quit his game in 29th Beijing
Olympic Games!
一But I still support him.After all,he is in poor health.
A.不填;the
B.a;the C.the;不填
D.the;the
评卷人
得分
三、阅读理解
(每空? 分,共?
分)