题目

When the meeting was , they all to their feet and left. A . at the end; raised B . at an end; rose C . in the end; raised D . by the end; rose 答案：B在太阳内部，氢原子核在超高温下发生    ，释放出巨大的核能；核电站利用的是核反应堆内的铀核发生    时所释放的核能来发电的．（填“聚变”或“裂变”）