[解析]
(1)A.细节理解题.根据文章第二段第三句Cheap rockets for space travel will have been developed,permitting long journeys throughout the solar system(太阳系).可知一百年以后我们要开发出便宜的火箭让我们到太阳系旅行.故A正确.
(2)D.细节理解题.根据第三段第二句There will be large cities in Antarctica.We already have supersonic(超音速的) flight,but in a hundred years' time we will have supersonic land travel as well.可知100年以后我们会有超音速的陆地交通工具.故D正确.
(3)B.主旨大意题.根据主题段We often think of future.We often wonder what the world would be like in a hundred years' time.可知本文主要讲述的是未来世界的一些情况.故B正确.