题目

—I shouted to you at the gate, but you didn't hear me. —Really? I a telephone call to my mother. A . make B . was making C . made D . have made 答案：B下列不属于获取目的基因的方法是（　　） A、“鸟枪法”B、转录法C、反转录法D、根据已知氨基酸序列合成法