题目

He reminded us to speed up, as the timefor the project. A . ran out B . has run out C . had run out D . was running out 答案：D2015年4月5日晚，天空出现的”红月亮“是月全食奇观，月全食的形成主要是由于（ ）A.光的直线传播B.小孔成像C.平面镜成像D.光的折射