"Because I was happy upon the heath,And smil'd among the winter'

"Because I was happy upon the heath,
And smil'd among the winter's snow;
They cloth'd me in the clothes of death，
And taught me to sing the notes of woe."
(From Blake's Chimney Sweeper from Songs of Experience)
Questions:
A.What does "heath"indicate?
B.What does "the clothes of death"mean?
C.What idea does the poem reveal?
【正确答案】：A.uncultivated land covered with shrubs.
B.clothes in dark color.
C.the poem reveals the true nature of religion which helps bring misery to the poor children.