题目

牛胚胎移植的基本程序如下图，请据图回答下面的问题。 （1）图中a过程分别是指                 ，一般要用              激素处理供体母牛。 （2）图中b过程为冲卵，即把供体母牛子宫内的                         冲出来。 冲卵的生理基础是______________________。 （3）图c过程是指                       ，此过程是胚胎工程其他技术的最后一道工序。 （4）在胚胎移植过程中，供、受体母牛选择好后，要用动1.They visited a science museum last Friday．________ did they________ last Friday?2.Lisa went shopping with her friends yesterday．________ did Lisa________ shopping with yesterday?3.Gina went to the post office this morning．________ did Gina________ this morning?4.I was late for school because I got up late this morning．________ ________ ________ late for school this morning?5.The book sale was great last weekend．________ ________ the book sale last weekend?