单选题
During their first teacher training year, the students often visited schools for the ______ of lessons.
【正确答案】
A
【答案解析】the observation of lessons听课观摩，观摩教学；investigation调查(investigation into sth．)；inspection视察，(上级对下级的)检查；examination考试，研究。句意：学生们在他们教师培训的第一年里经常到学校里观摩教学。