>>212823600She's a journalist attempting to conduct a professional interview. That typically means asking hard-hitting questions and aggressive followups (at least in political journalism, entertainment journalism is more casual). Lois admires Clark's naive idealism (that's why she wasn't phased by the Jor-El reveal), but she's trying to be a good journalist in this scene. It's a really great dialogue scene they way they both keep dropping in and out of character as the tension escalates.