I have cities, but there are not any houses in them．I have forests(森林), but there are not any trees in them．I have rivers, but there is not any water in them．What am I?A.Book．B.Picture．C.Pen．D.Map．
网友回答
我有城市，卻沒有任何在他們的房子。我有森林，但他們沒有任何樹木。我有河流，但那裡是沒有任何水。我是什麼？
网友回答
D