B: Chinese, history.
C: Physics, chemistry
(According to 2 and 4, the age order of the three people is, A, C and B..
Starting from 5, A and C live together.
There are three. A teaches math.
Starting from 4, A also teaches biology and C teaches physics.
From 1, C teaches chemistry.
The last remaining language, history, is taught by b)
Application for annual assessment of teachers 1
Dear leaders of the "special post teacher" qualification examination