题目

C 答案：调查某校学生中关于色盲的各种基因型及比例为：XBXB-42.32%、XBXb-7.36%、XbXb-0.32%、XBY-46%、XbY-4%，则该校学生中XB和Xb的基因频率分别是 A.6%、8%     B.92%、8%     C.78%、92%   D.8%、92%I ________ all my old magazines , and was beginning to get tired. [　　] A．looked throughB．was looking through C．had looked throughD．would be looking through