A.Where are you going?B.What are you going to study in middle school?

【答案】B

【解析】

where问的是地点；what问的是什么；初中middle school；将来时态be going to do结构，想知道玲玲上初中要学什么，应问What are you going to study in middle school? A是你去哪里的意思，不符合语境，故选B。