Choose the most reasonable measure by underlining it. 1. length of a pencil (19mm, 19cm, 9dm) 2. height of a child (12cm, 12dm, 12m) 3. height of a mountain (2000mm, 2000m, 2000dm) 4. length of cloth for a skirt (1m, 1mm, 1km) 5. distance from the earth to the moon (384,400m, 384,400km, 384,400dm)