题目

遗传学家，小麦育种专家李振声被授予中国国家最高科技奖。他用小麦与偃麦草进行远缘杂交，育成了一系列小麦良种，此培育过程运用的生物原理是（   ） A. 有性生殖    B. 无性生殖   C. 克隆技术    D. 转基因技术 答案：A—It is said that Nanjing Metro Line 3 ________ at the end of 2014.—That’s great! It will be much easier for more people to go out.A．will be built B．were built C．will build D．has built