题目

Have you ever thought about what will people die of 100 years later? It is not a simple question, if you have not been paying attention to the revolution in bio-technology. With the help of new medicine, the human body will last a much longer time. Death will come mainly from accidents, murder and war. Today’s leading killers, such as heart disease, cancer, and aging, will just become history. When it comes to technological changes, the Internet gets most of the attention these days. But the change in medicine can be the real technological event of our times. How long can humans live?依据如图的太阳直射点移动示意图，下列叙述正确的是（　　） A、直射点从①到⑤需要1个回归年B、直射点在②处时是12月22日前后C、直射点位于①、③、⑤时都是春分日D、直射点在从②到③期间，全球白昼逐渐变长