题目

66.   After nearly 20 hours in the operating room (手术室), the e_________ mother smiled when she heard the cry of her newborn baby. 67.   After finishing the work in the garden,she l_________ flat on her back in the warm sunshineenjoyably. 68.   It is not good m_________ to disturb(打扰) others when they are occupied/busy with their work. 69.   When did the world come into e_________? It still remains a mystery. 70.   Some stores will give 5 percent d_________ for paymentin cash. 71.   Deeply moved by her performance, the audience all stood up and applauded with a__方程x2+2x-3=0的两根的情况是（　　）A．没有实数根B．有两个不相等的实数根C．有两个相同的实数根D．不能确定