The course has the same spanish translation for “environ” and “autour”, being “alrededor”. it is not possible to hit the result without a 50% of error. If the course ask for “alrededor” the answer will always imply two possible options.
This is one of the official courses made by memrise. I moved your first post to Course Forum thread, where language specialists angileptol and Guillaume_Jaskula can see your post . You can go there by following the link above or clicking below.