听力原文:W: I heard you got a full mark in physics exams. Congratulations!M: Thanks! I'm s
听力原文:W: I heard you got a full mark in physics exams. Congratulations!
M: Thanks! I'm sure you also did a good job.
What's the probable relationship between the two speakers?
A.Teacher and student.
B.Wife and husband.
C.Mother and son.
D.Classmates.