题目

某生物的基因型为AaBB,通过下列技术可以分别将它转变为以下基因型的生物 ①AABB;②aB;③AaBBC;④AAaaBBBB。则以下排列正确的是 A.诱变育种、转基因技术、花药离体培养、细胞融合 B.杂交育种、花药离体培养、转基因技术、多倍体育种 C.花药离体培养、诱变育种、多倍体育种、转基因技术 D.多倍体育种、花药离体培养、诱变育种、转基因技术   — He didn’t go to help me with my English this morning, did he?—_____ , though he was not feeling very well. How kind he is!A. No, he didn’t. B. Yes, he did. C. No, he did. D. Yes, he didn’t
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