单项选择题
A．failure must come before success B．failure isn't all bad C．nature will help us if we let it D．people who fail first usually succeed in the end
A．the value of failure B．how people fail C．famous failures D．how not to fail
A．you can't defeat all your rivals(对手) B．you can't succeed in everything C．you can't always fail and that's all D．you can't do better than the great men mentioned above