题型:解答题 When we climbed up to the top of the mountain, we were all __________ ,but we were very happy. A.out of sightB.out of reachC.out of breathD.out of danger 查看答案
题型:解答题 灼热的太阳内部原子与原子之间的剧烈碰撞使核______(填“裂变”或“聚变”)不停地进行,从而不断辐射出巨大的光和热,给太阳系带来光明.地球上的物体接受阳光的照射,将光能变为自身的______能. 查看答案