A.How to observe and appreciate the world.B.How to make something to ease miner’’s work.C.How to become an above average miner.D.How to teach himself to become a great man.
A.How to observe and appreciate the world.
B.How to make something to ease miner’’s work.
C.How to become an "above average" miner.
D.How to teach himself to become a great man.