,栏目导航,B,A,B,A,B,A,Childrens Park,having fun,swimming,centers,tasty food,C,C,B,C,A,C,A,C,B,C,The space is very big. The Earth is only one of the planets.,The Moon is the nearest satellite from us, and we can travel to the Moon.,There is no air in space, so we will lose gravity in space.,We have to wear spacesuits to help us breathe.,We are able to take some photos on the Moon.,
