Test analysis: The ancients couldn't go to the moon. Now the successful launch of Chang 'e III has enabled China people to truly have the ability to "fly to the moon for nine days". From a philosophical point of view, this shows that practical activities are restricted by objective conditions and have a social history, which is correct and in line with the meaning of the topic; (3) Wrong, the viewpoint of understanding cycle is wrong; ? (4) Practice is the goal and destination of cognition, which is correct, but it has nothing to do with the meaning of the problem. The correct answer to this question is a.