It is 10 cm on the map. That is 100 km in real terms. I am proofreading and it seems odd that the writer always uses that in these cases. I would have said this. Who is right and who is ...
I can see the difference between "this" / "that" in most common contexts. There are a couple of unusual ones, though, that are still pretty unclear to me. Here are some of them: 1.A friend of ...