Troche podpowiem, ale pytajaca tez chyba to juz wie.
Tutaj chodzi o rownowage.
Gdy 2 rzeczy sa porownywane do siebie to uzyjemy 'as' np. 'as green as grass', 'as sumb as a bucket of rocks' ale gdy mowimy, ze jedna jest 'inna' od drugiej, tutaj w zdaniu 'more intelligent' to uzyjemy 'than'.
Zdania:
1. She is as beautiful as an actress.
2. She is more beautiful than an actress, bo '*she is more beautiful as an actress' jest bzdura.