１時限は何の授業ですか。
tbd
What do you have first period?
What class do you have first period?
What do you have the first period?
-----------------------------------
授業， じゅぎょう
1. lesson, class, teaching, instruction, classwork, schoolwork
课、课程、教学、指导、功课、学业
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调